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The present work proposes a novel methodology for an optimization procedure extending the optimal point to an optimal area based on an uncertainty map of deterministic optimization. To do so, this work proposes the deductions of a likelihood-based test to draw confidence regions of population-based optimizations. A novel Constrained Sliding Particle Swarm Optimization algorithm is also proposed that can cope with the optimization procedures characterized by multi-local minima. There are two open issues in the optimization literature, uncertainty analysis of the deterministic optimization and application of meta-heuristic algorithms to solve multi-local minima problems. The proposed methodology was evaluated in a series of five benchmark tests. The results demonstrated that the methodology is able to identify all the local minima and the global one, if any. Moreover, it was able to draw the confidence regions of all minima found by the optimization algorithm, hence, extending the optimal point to an optimal region. Moreover, providing the set of decision variables that can give an optimal value, with statistical confidence. Finally, the methodology is evaluated to address a case study from chemical engineering; the optimization of a complex multifunctional process where separation and reaction are processed simultaneously, a true moving bed reactor. The method was able to efficiently identify the two possible optimal operating regions of this process. Therefore, proving the practical application of this methodology.
Carine Rebello; Márcio Martins; José Loureiro; Alírio Rodrigues; Ana Ribeiro; Idelfonso Nogueira. From an Optimal Point to an Optimal Region: A Novel Methodology for Optimization of Multimodal Constrained Problems and a Novel Constrained Sliding Particle Swarm Optimization Strategy. Mathematics 2021, 9, 1808 .
AMA StyleCarine Rebello, Márcio Martins, José Loureiro, Alírio Rodrigues, Ana Ribeiro, Idelfonso Nogueira. From an Optimal Point to an Optimal Region: A Novel Methodology for Optimization of Multimodal Constrained Problems and a Novel Constrained Sliding Particle Swarm Optimization Strategy. Mathematics. 2021; 9 (15):1808.
Chicago/Turabian StyleCarine Rebello; Márcio Martins; José Loureiro; Alírio Rodrigues; Ana Ribeiro; Idelfonso Nogueira. 2021. "From an Optimal Point to an Optimal Region: A Novel Methodology for Optimization of Multimodal Constrained Problems and a Novel Constrained Sliding Particle Swarm Optimization Strategy." Mathematics 9, no. 15: 1808.
L-Asparaginase immobilization by adsorption over MWCNTs for potential application in pharmaceutical and food industries.
Raquel O. Cristóvão; Mafalda R. Almeida; Maria A. Barros; João C. F. Nunes; Rui Boaventura; José M. Loureiro; Joaquim L. Faria; Márcia C. Neves; Mara G. Freire; Valéria C. Ebinuma-Santos; Ana P. M. Tavares; Cláudia G. Silva. Development and characterization of a novel l-asparaginase/MWCNT nanobioconjugate. RSC Advances 2020, 10, 31205 -31213.
AMA StyleRaquel O. Cristóvão, Mafalda R. Almeida, Maria A. Barros, João C. F. Nunes, Rui Boaventura, José M. Loureiro, Joaquim L. Faria, Márcia C. Neves, Mara G. Freire, Valéria C. Ebinuma-Santos, Ana P. M. Tavares, Cláudia G. Silva. Development and characterization of a novel l-asparaginase/MWCNT nanobioconjugate. RSC Advances. 2020; 10 (52):31205-31213.
Chicago/Turabian StyleRaquel O. Cristóvão; Mafalda R. Almeida; Maria A. Barros; João C. F. Nunes; Rui Boaventura; José M. Loureiro; Joaquim L. Faria; Márcia C. Neves; Mara G. Freire; Valéria C. Ebinuma-Santos; Ana P. M. Tavares; Cláudia G. Silva. 2020. "Development and characterization of a novel l-asparaginase/MWCNT nanobioconjugate." RSC Advances 10, no. 52: 31205-31213.
A Ni phase dispersed in CO2 is used with a K promoter in the BRM. The LDH support structure collapses at high temperatures, inducing large Ni crystal sizes, and disfavoring activity. The catalyst is compensated by the K promoter, and the formation of an Mg–Al-spinel.
Adelino F. Cunha; Sergio Morales-Torres; Luisa M. Pastrana-Martínez; António A. Martins; Teresa M. Mata; Nídia S. Caetano; José M. Loureiro. Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material. RSC Advances 2020, 10, 21158 -21173.
AMA StyleAdelino F. Cunha, Sergio Morales-Torres, Luisa M. Pastrana-Martínez, António A. Martins, Teresa M. Mata, Nídia S. Caetano, José M. Loureiro. Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material. RSC Advances. 2020; 10 (36):21158-21173.
Chicago/Turabian StyleAdelino F. Cunha; Sergio Morales-Torres; Luisa M. Pastrana-Martínez; António A. Martins; Teresa M. Mata; Nídia S. Caetano; José M. Loureiro. 2020. "Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material." RSC Advances 10, no. 36: 21158-21173.
Water is one of the scarcest resources in the world, and it is becoming rarer fast, year after year. Chemical engineers are particularly suited to addressing the challenges of saving water and producing more fresh water. Proper education is then critical to prepare them for the upcoming decades. All student laboratories need distilled water, which is typically produced using commercial distillation units, which consume up to 70 L of fresh water per liter of distillated water. This work reports the design, construction, optimization, and operation of a water distillation unit that produces 10 liters per hour at 4 µS∙cm−1 and wastes no fresh water. Developed by a committed team made up of students, lab technicians, and instructors, this unit saves ca. 550 m3 of fresh water annually while spending less electrical power.
Luís Carlos Matos; Ana Eulálio; Tiago Antunes; José Miguel Loureiro; Alexandre Ferreira; Adélio Mendes. Project and Implementation of an Educational Large-Scale Water Distillation Unit with a Closed-Circuit Condenser. Sustainability 2020, 12, 3239 .
AMA StyleLuís Carlos Matos, Ana Eulálio, Tiago Antunes, José Miguel Loureiro, Alexandre Ferreira, Adélio Mendes. Project and Implementation of an Educational Large-Scale Water Distillation Unit with a Closed-Circuit Condenser. Sustainability. 2020; 12 (8):3239.
Chicago/Turabian StyleLuís Carlos Matos; Ana Eulálio; Tiago Antunes; José Miguel Loureiro; Alexandre Ferreira; Adélio Mendes. 2020. "Project and Implementation of an Educational Large-Scale Water Distillation Unit with a Closed-Circuit Condenser." Sustainability 12, no. 8: 3239.
The Particles Swarm Optimization (PSO) is an optimization technique that has been gaining attention in the last years. In this work, the PSO method is applied to optimize the productivity and the eluent consumption of the separation of the bi-naphthol enantiomers in a True Moving Bed (TMB) device. Three optimization strategies are presented: the two-steps optimization, the single optimization and a new version of the PSO algorithm, the Parallel PSO. All the three strategies showed to be efficient to perform the desired optimization. Comparing in terms of productivity and computation time (represented by the number of iterations), the Parallel PSO appeared to be the best compromise, which emphasizes the relevance of this new version to perform the optimization of the mentioned separation process. Generally, The TMB optimization results presented in this work had an average productivity that was 30% higher than the results previously reported in the literature. The best result was obtained using the Parallel PSO strategy in which a productivity of 209.2 g/Lads/day (corresponding to an eluent consumption of only 83.9 dL/g) was achieved. As the TMB is only a theoretical model, simulations with Simulated Moving Bed (SMB) devices with four, eight and twelve columns were obtained using the equivalence between the two models, and the results were compared.
Joana Matos; Rui P.V. Faria; Idelfonso B.R. Nogueira; José M. Loureiro; Ana M. Ribeiro. Optimization strategies for chiral separation by true moving bed chromatography using Particles Swarm Optimization (PSO) and new Parallel PSO variant. Computers & Chemical Engineering 2019, 123, 344 -356.
AMA StyleJoana Matos, Rui P.V. Faria, Idelfonso B.R. Nogueira, José M. Loureiro, Ana M. Ribeiro. Optimization strategies for chiral separation by true moving bed chromatography using Particles Swarm Optimization (PSO) and new Parallel PSO variant. Computers & Chemical Engineering. 2019; 123 ():344-356.
Chicago/Turabian StyleJoana Matos; Rui P.V. Faria; Idelfonso B.R. Nogueira; José M. Loureiro; Ana M. Ribeiro. 2019. "Optimization strategies for chiral separation by true moving bed chromatography using Particles Swarm Optimization (PSO) and new Parallel PSO variant." Computers & Chemical Engineering 123, no. : 344-356.
The separation of xylene isomers feedstock containing ethylbenzene is still a relevant industrial challenge. The increase in p-xylene consumption worldwide promotes the search for more efficient separation processes. One possible way to achieve such a goal is to upgrade the existing SMB units with selective adsorbents operating at lower temperatures. Therefore, new adsorbents such as the functionalized metal–organic framework MIL-125(Ti)_NH2 appear as strong candidates. The MIL-125(Ti)_NH2 was tested in this work for the selective adsorption and separation of xylene isomers, including ethylbenzene, in liquid phase and using n-heptane as eluent. In this way, a detailed experimental study of binary and multicomponent adsorption equilibrium of xylene isomers in MIL-125(Ti)_NH2, at three temperatures (299 K, 313 K and 343 K) in liquid phase, was performed and is reported in this manuscript. Ternary breakthrough experiments indicate competitive adsorption between p-xylene over the two other isomers. Indeed the selectivity values range from 1.4 to 1.9 and 1.5 to 2.3 for the p-xylene/m-xylene and p-xylene/o-xylene pairs, respectively, increasing with the temperature. Similar trends are observed for the quaternary mixtures, where p-xylene and ethylbenzene are adsorbed preferentially. However, the MIL-125(Ti)_NH2 does not discriminate between the two more linear molecules at lower temperatures. Yet, when temperature is increased to 343 K, the adsorption of p-xylene becomes more favorable than ethylbenzene, presenting a selectivity of 1.3. Therefore, within the studied temperature range a temperature, 343 K is the most favorable temperature to operate the SMB process, for the p-xylene production from mixtures containing ethylbenzene.
Mariana A. Moreira; Mónica P. S. Santos; Cláudia G. Silva; José M. Loureiro; Jong-San Chang; Christian Serre; Alexandre F. P. Ferreira; Alírio E. Rodrigues. Adsorption equilibrium of xylene isomers and ethylbenzene on MIL-125(Ti)_NH2: the temperature influence on the para-selectivity. Adsorption 2018, 24, 715 -724.
AMA StyleMariana A. Moreira, Mónica P. S. Santos, Cláudia G. Silva, José M. Loureiro, Jong-San Chang, Christian Serre, Alexandre F. P. Ferreira, Alírio E. Rodrigues. Adsorption equilibrium of xylene isomers and ethylbenzene on MIL-125(Ti)_NH2: the temperature influence on the para-selectivity. Adsorption. 2018; 24 (8):715-724.
Chicago/Turabian StyleMariana A. Moreira; Mónica P. S. Santos; Cláudia G. Silva; José M. Loureiro; Jong-San Chang; Christian Serre; Alexandre F. P. Ferreira; Alírio E. Rodrigues. 2018. "Adsorption equilibrium of xylene isomers and ethylbenzene on MIL-125(Ti)_NH2: the temperature influence on the para-selectivity." Adsorption 24, no. 8: 715-724.
The n-Propyl Propionate (ProPro) is a compound that has several possible industrial applications. However, the current production route of this component presents several problems, such as the downstream purification. In this way, chromatographic separation could be an alternative solution to the downstream purification. In this work experimental studies of the ProPro reaction system separation in a chromatographic fixed bed unit packed with Amberlyst 46 were performed. The adsorption equilibrium isotherms and the corresponding Langmuir model parameters were determined. A phenomenological model to represent the process was developed and validated through the experimental data. Meanwhile, it is proposed the characterization of the uncertainties of all steps and its extension to the model prediction, which allowed to estimate the model parameters with a reduced number of experiments, when compared with other reports in the literature; nevertheless, the final results lead to a statistically more reliable model.
Idelfonso B.R. Nogueira; Rui P.V. Faria; Reiner Requião; Hannu Koivisto; Marcio Martins; Alírio E. Rodrigues; José M. Loureiro; Ana M. Ribeiro. Chromatographic studies of n-Propyl Propionate: Adsorption equilibrium, modelling and uncertainties determination. Computers & Chemical Engineering 2018, 119, 371 -382.
AMA StyleIdelfonso B.R. Nogueira, Rui P.V. Faria, Reiner Requião, Hannu Koivisto, Marcio Martins, Alírio E. Rodrigues, José M. Loureiro, Ana M. Ribeiro. Chromatographic studies of n-Propyl Propionate: Adsorption equilibrium, modelling and uncertainties determination. Computers & Chemical Engineering. 2018; 119 ():371-382.
Chicago/Turabian StyleIdelfonso B.R. Nogueira; Rui P.V. Faria; Reiner Requião; Hannu Koivisto; Marcio Martins; Alírio E. Rodrigues; José M. Loureiro; Ana M. Ribeiro. 2018. "Chromatographic studies of n-Propyl Propionate: Adsorption equilibrium, modelling and uncertainties determination." Computers & Chemical Engineering 119, no. : 371-382.
A micro-meso-structured reactor (NETmix) was used for the first time to promote UVC/H2O2 processes.
Belisa A. Marinho; M. J. Martín de Vidales; Luciana P. Mazur; L. Paulista; Raquel O. Cristóvão; Diego A. Mayer; José M. Loureiro; Rui Boaventura; Madalena M. Dias; José Carlos B. Lopes; Vítor J. P. Vilar. Application of a micro-meso-structured reactor (NETmix) to promote photochemical UVC/H2O2 processes – oxidation of As(iii) to As(v). Photochemical & Photobiological Sciences 2018, 17, 1179 -1188.
AMA StyleBelisa A. Marinho, M. J. Martín de Vidales, Luciana P. Mazur, L. Paulista, Raquel O. Cristóvão, Diego A. Mayer, José M. Loureiro, Rui Boaventura, Madalena M. Dias, José Carlos B. Lopes, Vítor J. P. Vilar. Application of a micro-meso-structured reactor (NETmix) to promote photochemical UVC/H2O2 processes – oxidation of As(iii) to As(v). Photochemical & Photobiological Sciences. 2018; 17 (9):1179-1188.
Chicago/Turabian StyleBelisa A. Marinho; M. J. Martín de Vidales; Luciana P. Mazur; L. Paulista; Raquel O. Cristóvão; Diego A. Mayer; José M. Loureiro; Rui Boaventura; Madalena M. Dias; José Carlos B. Lopes; Vítor J. P. Vilar. 2018. "Application of a micro-meso-structured reactor (NETmix) to promote photochemical UVC/H2O2 processes – oxidation of As(iii) to As(v)." Photochemical & Photobiological Sciences 17, no. 9: 1179-1188.
The current work presents different approaches to overcome mass and photon transfer limitations in heterogeneous photocatalytic processes applied to the reduction of hexavalent chromium to its trivalent form in the presence of a sacrificial agent. Two reactor designs were tested, a monolithic tubular photoreactor (MTP) and a micro-meso-structured photoreactor (NETmix), both presenting a high catalyst surface area per reaction liquid volume. In order to reduce photon transfer limitations, the tubular photoreactor was packed with transparent cellulose acetate monolithic structures (CAM) coated with the catalyst by a dip-coating method. For the NETmix reactor, a thin film of photocatalyst was uniformly deposited on the front glass slab (GS) or on the network of channels and chambers imprinted in the back stainless steel slab (SSS) using a spray system. The reaction rate for the NETmix photoreactor was evaluated for two illumination sources, solar light or UVA-LEDs, using the NETmix with the front glass slab or/and back stainless steel slab coated with TiO-P25. The reusability of the photocatalytic films on the NETmix walls was also evaluated for three consecutive cycles using fresh Cr(VI) solutions. The catalyst reactivity in combination with the NETmix-SSS photoreactor is almost 70 times superior to one obtained with the MTP.
Belisa A. Marinho; Raquel O. Cristóvão; Ridha Djellabi; Ana Caseiro; Sandra M. Miranda; José M. Loureiro; Rui A.R. Boaventura; Madalena M. Dias; José Carlos B. Lopes; Vítor J.P. Vilar. Strategies to reduce mass and photons transfer limitations in heterogeneous photocatalytic processes: Hexavalent chromium reduction studies. Journal of Environmental Management 2018, 217, 555 -564.
AMA StyleBelisa A. Marinho, Raquel O. Cristóvão, Ridha Djellabi, Ana Caseiro, Sandra M. Miranda, José M. Loureiro, Rui A.R. Boaventura, Madalena M. Dias, José Carlos B. Lopes, Vítor J.P. Vilar. Strategies to reduce mass and photons transfer limitations in heterogeneous photocatalytic processes: Hexavalent chromium reduction studies. Journal of Environmental Management. 2018; 217 ():555-564.
Chicago/Turabian StyleBelisa A. Marinho; Raquel O. Cristóvão; Ridha Djellabi; Ana Caseiro; Sandra M. Miranda; José M. Loureiro; Rui A.R. Boaventura; Madalena M. Dias; José Carlos B. Lopes; Vítor J.P. Vilar. 2018. "Strategies to reduce mass and photons transfer limitations in heterogeneous photocatalytic processes: Hexavalent chromium reduction studies." Journal of Environmental Management 217, no. : 555-564.
The quality control and optimization of Simulated Moving Bed processes are still a challenge. Among the main reasons for that, the real time measurement of its main properties can be highlighted. Further developments in this field are necessary in order to allow the development of better control and optimization systems of these units. In the present work, a system composed by two Artificial Neural Networks working concomitantly with an offline measurement system is proposed, named Quasi-Virtual Analyser (Q-VOA) system. The development of the Q-VOA is presented and the system is simulated in order to evaluate its efficiency. The methodology used to select the input variables for the Q-VOA is another contribution of this work. The results show that the Q-VOA is capable of reducing the system errors and keep the prediction closer to the process true responses, when compared with the simple VOA system, which is based solely on model predictions. Furthermore, the results show the efficiency of the measurement system even under the presence of non-measured perturbations.
Idelfonso B.R. Nogueira; Ana M. Ribeiro; Reiner Requião; Karen Pontes; Hannu Koivisto; Alírio E. Rodrigues; José M. Loureiro. A quasi-virtual online analyser based on an artificial neural networks and offline measurements to predict purities of raffinate/extract in simulated moving bed processes. Applied Soft Computing 2018, 67, 29 -47.
AMA StyleIdelfonso B.R. Nogueira, Ana M. Ribeiro, Reiner Requião, Karen Pontes, Hannu Koivisto, Alírio E. Rodrigues, José M. Loureiro. A quasi-virtual online analyser based on an artificial neural networks and offline measurements to predict purities of raffinate/extract in simulated moving bed processes. Applied Soft Computing. 2018; 67 ():29-47.
Chicago/Turabian StyleIdelfonso B.R. Nogueira; Ana M. Ribeiro; Reiner Requião; Karen Pontes; Hannu Koivisto; Alírio E. Rodrigues; José M. Loureiro. 2018. "A quasi-virtual online analyser based on an artificial neural networks and offline measurements to predict purities of raffinate/extract in simulated moving bed processes." Applied Soft Computing 67, no. : 29-47.
Due to the industrialization, it is urgent to reduce the carbon dioxide emissions. For that, diverse technologies can be applied. In adsorption processes, the development of new materials is an emerging challenge in order to increase the CO2 adsorption capacity of materials and the efficiency of the processes. In this work, a new hybrid honeycomb monolith composed by zeolite and activated carbon was produced by extrusion process. Single adsorption equilibrium isotherms of carbon dioxide and nitrogen were measured by a gravimetric method using a Rubotherm® magnetic suspension balance at three temperatures, 303, 333 and 373 K. The experimental points were well described by Dual-Site Langmuir model. The material presented a carbon dioxide adsorption capacity of 2.63 mol kg−1 at 1 bar and 303 K. Binary breakthrough curves were obtained at 298 K and 2.4 bar with different feed mixtures. The experimental results of adsorption equilibrium were validated with the Dual-Site Langmuir isotherm extended to multicomponent mixtures. A mathematical model was applied to predict the dynamic behaviour of the adsorption bed.
Maria João Regufe; Alexandre F. P. Ferreira; José Miguel Loureiro; Yixiang Shi; Alírio Rodrigues; Ana Mafalda Ribeiro. New hybrid composite honeycomb monolith with 13X zeolite and activated carbon for CO2 capture. Adsorption 2018, 24, 249 -265.
AMA StyleMaria João Regufe, Alexandre F. P. Ferreira, José Miguel Loureiro, Yixiang Shi, Alírio Rodrigues, Ana Mafalda Ribeiro. New hybrid composite honeycomb monolith with 13X zeolite and activated carbon for CO2 capture. Adsorption. 2018; 24 (3):249-265.
Chicago/Turabian StyleMaria João Regufe; Alexandre F. P. Ferreira; José Miguel Loureiro; Yixiang Shi; Alírio Rodrigues; Ana Mafalda Ribeiro. 2018. "New hybrid composite honeycomb monolith with 13X zeolite and activated carbon for CO2 capture." Adsorption 24, no. 3: 249-265.
Adelino F. Cunha; Miguel N. Moreira; Ana M. Ribeiro; José M. Loureiro; Alírio E. Rodrigues; Janvit Teržan; Petar Djinović; Albin Pintar. Synthesis gas adjustment by low temperature sorption enhanced water-gas shift reaction through a copper-zeolite 13X hybrid material. Chemical Engineering and Processing: Process Intensification 2017, 121, 97 -110.
AMA StyleAdelino F. Cunha, Miguel N. Moreira, Ana M. Ribeiro, José M. Loureiro, Alírio E. Rodrigues, Janvit Teržan, Petar Djinović, Albin Pintar. Synthesis gas adjustment by low temperature sorption enhanced water-gas shift reaction through a copper-zeolite 13X hybrid material. Chemical Engineering and Processing: Process Intensification. 2017; 121 ():97-110.
Chicago/Turabian StyleAdelino F. Cunha; Miguel N. Moreira; Ana M. Ribeiro; José M. Loureiro; Alírio E. Rodrigues; Janvit Teržan; Petar Djinović; Albin Pintar. 2017. "Synthesis gas adjustment by low temperature sorption enhanced water-gas shift reaction through a copper-zeolite 13X hybrid material." Chemical Engineering and Processing: Process Intensification 121, no. : 97-110.
Pervaporation-based hybrid processes have been investigated to overcome the drawbacks of equilibrium-limited reactions. Pervaporation processes are strongly recommended for heat-sensitive products and azeotropic mixtures as in the butyl acrylate system case, since pervaporation can operate at lower temperatures than distillation. In this work, experimental pervaporation data for multicomponent mixtures in the absence of reaction were measured for the compounds involved in the esterification reaction of acrylic acid with n-butanol at different temperatures: 323, 353, and 363 K. A commercial tubular microporous silica membrane from Pervatech was used which is highly selective to water, and its performance was evaluated by studying several parameters, like the selectivity, permeate fluxes, driving force of species, and separation factor. The effects of temperature and feed composition were assessed for binary, ternary, and quaternary mixtures. Increasing the temperature increases significantly the total permeate flux as well as the separation factor, which is higher for quaternary mixtures. The presence of butyl acrylate and acrylic acid reduces the total permeate flux since these molecules hinder the water permeation. The permeance of each species was correlated with temperature according to the Arrhenius equation, and a mathematical model was proposed to develop an integrated reaction–separation process using the experimental data obtained. The reaction conversion of the fixed-bed membrane reactor at steady state achieved 98.7% at isothermal conditions, increasing by 66% the conversion obtained in a fixed-bed reactor (at the same operating conditions).
Dânia S. M. Constantino; Rui P. V. Faria; Ana M. Ribeiro; José M. Loureiro; Alírio E. Rodrigues. Performance Evaluation of Pervaporation Technology for Process Intensification of Butyl Acrylate Synthesis. Industrial & Engineering Chemistry Research 2017, 56, 13064 -13074.
AMA StyleDânia S. M. Constantino, Rui P. V. Faria, Ana M. Ribeiro, José M. Loureiro, Alírio E. Rodrigues. Performance Evaluation of Pervaporation Technology for Process Intensification of Butyl Acrylate Synthesis. Industrial & Engineering Chemistry Research. 2017; 56 (45):13064-13074.
Chicago/Turabian StyleDânia S. M. Constantino; Rui P. V. Faria; Ana M. Ribeiro; José M. Loureiro; Alírio E. Rodrigues. 2017. "Performance Evaluation of Pervaporation Technology for Process Intensification of Butyl Acrylate Synthesis." Industrial & Engineering Chemistry Research 56, no. 45: 13064-13074.
Yaidelin Manrique; Ahmet R. Özdural; Dominique Trébouet; Ana M. Ribeiro; José M. Loureiro. Explicit equation for the determination of the overall mass transfer coefficient in a hollow fiber membrane contactor. Chemical Engineering Science 2017, 166, 210 -219.
AMA StyleYaidelin Manrique, Ahmet R. Özdural, Dominique Trébouet, Ana M. Ribeiro, José M. Loureiro. Explicit equation for the determination of the overall mass transfer coefficient in a hollow fiber membrane contactor. Chemical Engineering Science. 2017; 166 ():210-219.
Chicago/Turabian StyleYaidelin Manrique; Ahmet R. Özdural; Dominique Trébouet; Ana M. Ribeiro; José M. Loureiro. 2017. "Explicit equation for the determination of the overall mass transfer coefficient in a hollow fiber membrane contactor." Chemical Engineering Science 166, no. : 210-219.
The control of Simulated Moving Bed (SMB) units is challenging due to their complex dynamic behaviour and the difficulty of measuring their main properties. Furthermore, for the SMB units, the transfer function identification when the unit is operating at its optimal point is not easy to be done through the usual way. This work presents the development of a novel strategy to identify transfer functions of TMB/SMB and its application on classical linear model predictive controllers (MPC). However, for the process in study, due its unique dynamics, only the identification of the linear model is not enough to solve its control problem. Therefore, it is proposed a modification in the MPC prediction, that consists in a strategy based on a switching system where the most adequate transfer function is employed in the controller to overcome the problems related with the process dynamic behaviour. The results show that the used methodology enables the easy identification of transfer functions at the process optimal operating point and that the MPC can control the process in both the servo and regulator problem cases. It is also showed that the transfer function identified can be applied in the control of a SMB unit with four columns, under its optimal conditions.
Idelfonso B.R. Nogueira; Ana M. Ribeiro; Marcio Martins; Alírio E. Rodrigues; Hannu Koivisto; José M. Loureiro. Dynamics of a True Moving Bed separation process: Linear model identification and advanced process control. Journal of Chromatography A 2017, 1504, 112 -123.
AMA StyleIdelfonso B.R. Nogueira, Ana M. Ribeiro, Marcio Martins, Alírio E. Rodrigues, Hannu Koivisto, José M. Loureiro. Dynamics of a True Moving Bed separation process: Linear model identification and advanced process control. Journal of Chromatography A. 2017; 1504 ():112-123.
Chicago/Turabian StyleIdelfonso B.R. Nogueira; Ana M. Ribeiro; Marcio Martins; Alírio E. Rodrigues; Hannu Koivisto; José M. Loureiro. 2017. "Dynamics of a True Moving Bed separation process: Linear model identification and advanced process control." Journal of Chromatography A 1504, no. : 112-123.
Belisa Marinho; Ridha Djellabi; Raquel Cristóvão; José M. Loureiro; Rui Boaventura; Madalena Dias; José Carlos Lopes; Vítor J.P. Vilar. Intensification of heterogeneous TiO2 photocatalysis using an innovative micro–meso-structured-reactor for Cr(VI) reduction under simulated solar light. Chemical Engineering Journal 2017, 318, 76 -88.
AMA StyleBelisa Marinho, Ridha Djellabi, Raquel Cristóvão, José M. Loureiro, Rui Boaventura, Madalena Dias, José Carlos Lopes, Vítor J.P. Vilar. Intensification of heterogeneous TiO2 photocatalysis using an innovative micro–meso-structured-reactor for Cr(VI) reduction under simulated solar light. Chemical Engineering Journal. 2017; 318 ():76-88.
Chicago/Turabian StyleBelisa Marinho; Ridha Djellabi; Raquel Cristóvão; José M. Loureiro; Rui Boaventura; Madalena Dias; José Carlos Lopes; Vítor J.P. Vilar. 2017. "Intensification of heterogeneous TiO2 photocatalysis using an innovative micro–meso-structured-reactor for Cr(VI) reduction under simulated solar light." Chemical Engineering Journal 318, no. : 76-88.
Belisa Marinho; Raquel Cristóvão; Ridha Djellabi; José M. Loureiro; Rui Boaventura; Vítor J.P. Vilar. Photocatalytic reduction of Cr(VI) over TiO2-coated cellulose acetate monolithic structures using solar light. Applied Catalysis B: Environmental 2017, 203, 18 -30.
AMA StyleBelisa Marinho, Raquel Cristóvão, Ridha Djellabi, José M. Loureiro, Rui Boaventura, Vítor J.P. Vilar. Photocatalytic reduction of Cr(VI) over TiO2-coated cellulose acetate monolithic structures using solar light. Applied Catalysis B: Environmental. 2017; 203 ():18-30.
Chicago/Turabian StyleBelisa Marinho; Raquel Cristóvão; Ridha Djellabi; José M. Loureiro; Rui Boaventura; Vítor J.P. Vilar. 2017. "Photocatalytic reduction of Cr(VI) over TiO2-coated cellulose acetate monolithic structures using solar light." Applied Catalysis B: Environmental 203, no. : 18-30.
Dânia S. M. Constantino; Rui P. V. Faria; Carla S. M. Pereira; José M. Loureiro; Alírio. E. Rodrigues. Enhanced Simulated Moving Bed Reactor Process for Butyl Acrylate Synthesis: Process Analysis and Optimization. Industrial & Engineering Chemistry Research 2016, 55, 10735 -10743.
AMA StyleDânia S. M. Constantino, Rui P. V. Faria, Carla S. M. Pereira, José M. Loureiro, Alírio. E. Rodrigues. Enhanced Simulated Moving Bed Reactor Process for Butyl Acrylate Synthesis: Process Analysis and Optimization. Industrial & Engineering Chemistry Research. 2016; 55 (40):10735-10743.
Chicago/Turabian StyleDânia S. M. Constantino; Rui P. V. Faria; Carla S. M. Pereira; José M. Loureiro; Alírio. E. Rodrigues. 2016. "Enhanced Simulated Moving Bed Reactor Process for Butyl Acrylate Synthesis: Process Analysis and Optimization." Industrial & Engineering Chemistry Research 55, no. 40: 10735-10743.
Toxic hexavalent chromium reduction to less toxic trivalent chromium was evaluated using a solar driven photocatalytic system, Fe(III)/UV, in the presence of organic sacrificial agents. The photocatalytic reduction experiments were conducted in a lab-scale tubular photoreactor with compound parabolic collectors under simulated solar radiation. The effect of parameters such as iron (1–12 mg L−1) and citric acid (0.058–3.840 mM) concentrations, pH value (3.0–8.0), temperature (15–40 °C), UVA irradiation source and initial Cr(VI) concentration (1, 10, 20, 40 mg L−1) on the process efficiency was analyzed, and also the addition of other organic ligands like oxalic acid, maleic acid and EDTA. The presence of citric acid proved to enhance the Cr(VI) reduction by Fe(III)/UV due to the formation of Fe(III)-Citrate complexes, providing a quicker pathway for ferric iron regeneration in the presence of UV–vis light. The organic ligands proved to act also as sacrificial agents of reactive oxygen species formed, avoiding the Cr(III) re-oxidation. The catalytic activity of the organic ligands in the Cr(VI) reduction by Fe(III)/UV followed this order: citric acid > oxalic acid > EDTA > maleic acid. The best Cr(VI) reduction (99% in 15 min) was achieved with citric acid in a Cr(VI):Citric acid molar ratio of 1:3 at pH 5 and 25 °C. Finally, the photocatalytic reduction of Cr(VI) present in a real effluent was achieved after 30 min, demonstrating the potential of the Fe(III)/UVA-vis/citric acid system for the treatment of Cr(VI) containing wastewaters.
Belisa A. Marinho; Raquel O. Cristóvão; José M. Loureiro; Rui A.R. Boaventura; Vítor J.P. Vilar. Solar photocatalytic reduction of Cr(VI) over Fe(III) in the presence of organic sacrificial agents. Applied Catalysis B: Environmental 2016, 192, 208 -219.
AMA StyleBelisa A. Marinho, Raquel O. Cristóvão, José M. Loureiro, Rui A.R. Boaventura, Vítor J.P. Vilar. Solar photocatalytic reduction of Cr(VI) over Fe(III) in the presence of organic sacrificial agents. Applied Catalysis B: Environmental. 2016; 192 ():208-219.
Chicago/Turabian StyleBelisa A. Marinho; Raquel O. Cristóvão; José M. Loureiro; Rui A.R. Boaventura; Vítor J.P. Vilar. 2016. "Solar photocatalytic reduction of Cr(VI) over Fe(III) in the presence of organic sacrificial agents." Applied Catalysis B: Environmental 192, no. : 208-219.
Raquel Cristóvão; Victor M.S. Pinto; António Gonçalves; Ramiro J.E. Martins; José M. Loureiro; Rui Boaventura. Fish canning industry wastewater variability assessment using multivariate statistical methods. Process Safety and Environmental Protection 2016, 102, 263 -276.
AMA StyleRaquel Cristóvão, Victor M.S. Pinto, António Gonçalves, Ramiro J.E. Martins, José M. Loureiro, Rui Boaventura. Fish canning industry wastewater variability assessment using multivariate statistical methods. Process Safety and Environmental Protection. 2016; 102 ():263-276.
Chicago/Turabian StyleRaquel Cristóvão; Victor M.S. Pinto; António Gonçalves; Ramiro J.E. Martins; José M. Loureiro; Rui Boaventura. 2016. "Fish canning industry wastewater variability assessment using multivariate statistical methods." Process Safety and Environmental Protection 102, no. : 263-276.