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In this study, the thermal stability and corrosivity of various CO2-loaded tertiary amine blends in both aqueous and non-aqueous form in stainless steel cylinders were studied for combined acid gas and water removal. The thermal stability was measured from the remaining amine concentration and the corrosivity was measured from the amount of various metals in blends using titration and inductively coupled plasma mass spectrometry (ICP-MS), respectively. The experimental data were used to calculate the rate constants of amine group loss. The developed model represented the experimental data very well. Solvent change from H2O to triethylene glycol (TEG) in blends decreased the thermal stability and vice versa for corrosivity. The amine stability was increased when contact with stainless steel was reduced. An increase in the amine concentration or CO2 loading at constant temperature decreased the thermal stability and vice versa for corrosivity.
Usman Shoukat; Hanna Katariina Knuutila. Effect of Various Parameters on the Thermal Stability and Corrosion of CO2-Loaded Tertiary Amine Blends. Energies 2020, 13, 2626 .
AMA StyleUsman Shoukat, Hanna Katariina Knuutila. Effect of Various Parameters on the Thermal Stability and Corrosion of CO2-Loaded Tertiary Amine Blends. Energies. 2020; 13 (10):2626.
Chicago/Turabian StyleUsman Shoukat; Hanna Katariina Knuutila. 2020. "Effect of Various Parameters on the Thermal Stability and Corrosion of CO2-Loaded Tertiary Amine Blends." Energies 13, no. 10: 2626.
A Fourier transform infrared (FTIR) spectroscopy method was developed to identify and quantify various components in an amine-based combined acid gas and water removal process. In this work, an attenuated total reflectance (ATR) probe was used. A partial least-squares (PLS) regression model was also developed using up to four components (methyl diethanolamine (MDEA)-H2O-CO2-ethylene glycol/triethylene glycol (MEG/TEG)), and it was successfully validated. The model was applied on thermally degraded CO2-loaded MDEA blends to predict the weight percentages of MDEA, H2O, CO2, and MEG or TEG to test the performance spectrum. The results confirmed that FTIR could be used as a simpler, quicker and reliable tool to identify and quantify various compounds such as MDEA, MEG/TEG, H2O and CO2 simultaneously in a combined acid gas and water removal process.
Usman Shoukat; Eva Baumeister; Hanna K. Knuutila. ATR-FTIR Model Development and Verification for Qualitative and Quantitative Analysis in MDEA–H2O–MEG/TEG–CO2 Blends. Energies 2019, 12, 3285 .
AMA StyleUsman Shoukat, Eva Baumeister, Hanna K. Knuutila. ATR-FTIR Model Development and Verification for Qualitative and Quantitative Analysis in MDEA–H2O–MEG/TEG–CO2 Blends. Energies. 2019; 12 (17):3285.
Chicago/Turabian StyleUsman Shoukat; Eva Baumeister; Hanna K. Knuutila. 2019. "ATR-FTIR Model Development and Verification for Qualitative and Quantitative Analysis in MDEA–H2O–MEG/TEG–CO2 Blends." Energies 12, no. 17: 3285.
Various novel amine solutions both in aqueous and non-aqueous [monoethylene glycol (MEG)/triethylene glycol(TEG)] forms have been studied for hydrogen sulfide (H2S) absorption. The study was conducted in a custom build experimental setup at temperatures relevant to subsea operation conditions and atmospheric pressure. Liquid phase absorbed H2S, and amine concentrations were measured analytically to calculate H2S loading (mole of H2S/mole of amine). Maximum achieved H2S loadings as the function of pKa, gas partial pressure, temperature and amine concentration are presented. Effects of solvent type on absorbed H2S have also been discussed. Several new solvents showed higher H2S loading as compared to aqueous N-Methyldiethanolamine (MDEA) solution which is the current industrial benchmark compound for selective H2S removal in natural gas sweetening process.
Usman Shoukat; Diego D. D. Pinto; Hanna K. Knuutila. Study of Various Aqueous and Non-Aqueous Amine Blends for Hydrogen Sulfide Removal from Natural Gas. Processes 2019, 7, 160 .
AMA StyleUsman Shoukat, Diego D. D. Pinto, Hanna K. Knuutila. Study of Various Aqueous and Non-Aqueous Amine Blends for Hydrogen Sulfide Removal from Natural Gas. Processes. 2019; 7 (3):160.
Chicago/Turabian StyleUsman Shoukat; Diego D. D. Pinto; Hanna K. Knuutila. 2019. "Study of Various Aqueous and Non-Aqueous Amine Blends for Hydrogen Sulfide Removal from Natural Gas." Processes 7, no. 3: 160.
Usman Shoukat; Eva Baumeister; Diego D.D. Pinto; Hanna K. Knuutila. Thermal stability and corrosion of tertiary amines in aqueous amine and amine-glycol-water solutions for combined acid gas and water removal. Journal of Natural Gas Science and Engineering 2019, 62, 26 -37.
AMA StyleUsman Shoukat, Eva Baumeister, Diego D.D. Pinto, Hanna K. Knuutila. Thermal stability and corrosion of tertiary amines in aqueous amine and amine-glycol-water solutions for combined acid gas and water removal. Journal of Natural Gas Science and Engineering. 2019; 62 ():26-37.
Chicago/Turabian StyleUsman Shoukat; Eva Baumeister; Diego D.D. Pinto; Hanna K. Knuutila. 2019. "Thermal stability and corrosion of tertiary amines in aqueous amine and amine-glycol-water solutions for combined acid gas and water removal." Journal of Natural Gas Science and Engineering 62, no. : 26-37.
In order to meet future challenges in subsea production and processing compact systems for hydrate control and selective H2S/CO2 removal can be used. The development of an amine-based regenerative process whereby both water and H2S/CO2 are removed may involve corrosion problems. In this study, the amine stability and corrosion tendencies of 30 wt% aqueous solutions of 2-ethanolamine and N-Methydiethanolamine under high temperatures in presence of MEG/TEG, have been experimentally studied. The results show that the presence of MEG/TEG (in the absence of water) influence both the amine degradation and corrosion. Furthermore, the results indicate that the influence of MEG or TEG is dependent on the amine used.
Usman Shoukat; Georgios Fytianos; Hanna K. Knuutila. Thermal stability and corrosion studies of amines for combined acid gas removal and hydrate control for subsea gas treatment systems. 2016 Techno-Ocean (Techno-Ocean) 2016, 176 -180.
AMA StyleUsman Shoukat, Georgios Fytianos, Hanna K. Knuutila. Thermal stability and corrosion studies of amines for combined acid gas removal and hydrate control for subsea gas treatment systems. 2016 Techno-Ocean (Techno-Ocean). 2016; ():176-180.
Chicago/Turabian StyleUsman Shoukat; Georgios Fytianos; Hanna K. Knuutila. 2016. "Thermal stability and corrosion studies of amines for combined acid gas removal and hydrate control for subsea gas treatment systems." 2016 Techno-Ocean (Techno-Ocean) , no. : 176-180.