Entrepreneurship and Sustainability Issues is a peer-reviewed journal which publishes original research papers and case studies

The article presents results of the researches on creation of integrated quality management system for food enterprise reflecting branch specifics in a basis of the international ISO standards of series 9000 and the principles of HACCP. Theoretical and practical aspects of construction and development of systems of QMS and HACCP are analysed and the technique of creation of the integrated quality management system (IQMS) of the Raimbek Agro Company is offered. Degrees of compatibility of the international ISO 9001:2015 standard (ST RK ISO 9001-2016) and the principles of HACCP (ST RK 1179-2003) are defined. The conceptual model of the IQMS is offered. Areas of integration of HACCP and QMS systems are also established and the additive model of creation of the IQMS is chosen. The network of the processes of the IQMS of the Raimbek Agro Company on the basis of the carried-out processes integration is created.

This article presents the results of research on the development of chemically resistant polymer–mineral casting composites based on industrial waste. The aim of this work is to develop a technological basis for obtaining effective inorganic fillers and highly filled composites for use in chlorine-containing environments. On the basis of theoretical data, mineral fillers and a polymer binder for filling composites were selected, optimal quantities of input hardeners and an appropriate thermal curing mode were determined, and the influence of the filling degree on the properties of composites was studied. The influence of various factors on the properties of the obtained composites was also studied, and the possibility of using local raw materials to obtain special-purpose composites was investigated. Ash from a thermal power plant (TPP) was used as an acid-resistant filler in composites. Two components were chosen as binders: phenol formaldehyde resin and mineral filler (TPP ash). As the third component, hydrolytically active fillers—anhydrite, phosphogypsum and phosphate slag—were used. The degree of filling has a significant influence on the properties of composites, including the compressive strength, chemical resistance and degree of curing, the values of which were elucidated across a wide range of composite variations based on the degree of filling. The conducted research allowed us to establish the limit of admissible anhydrite content, which should not exceed 15 mas.%. To optimize the chemical resistance and durability of the composites of the investigated substances, the method of mathematical planning was used. According to the results of this study, the optimal compositions of composites, in terms of anhydrite, phosphogypsum and phosphorus slag contents, were selected. At the maximum possible degree of filling, these composites exhibit high target characteristics.

Entrepreneurship and Sustainability Issues is a peer-reviewed journal which publishes original research papers and case studies

Introduction: This article presents research data on the processes used to produce concentrated phosphoric acid from Karatau phosphate rock. Methods: The study investigated the purification of wet-process phosphoric acid using liquid-liquid extraction with organic solvents. To determine the composition of extractable complexes formed during the extraction of phosphoric acid with tributyl phosphate and n-butyl alcohol, infrared spectroscopy was employed. In addition, physicochemical transformations under thermal exposure were analyzed using differential thermal analysis. Results: The effect of magnesium salts and sulfuric acid impurities on the distribution factor of phosphoric acid was investigated. Increasing the initial concentration of phosphoric acid from 5.38% to 25.61% P₂O₅ at 25°C led to an increase in the distribution factor from 0.178 to 0.436 for n-butyl alcohol, from 0.06 to 0.183 for isoamyl alcohol, and from 0.120 to 0.320 for tributyl phosphate. Increasing the temperature from 25°C to 60°C had little to no impact on the distribution factor. The results showed that the distribution factors of phosphoric acid are influenced by its initial concentration, particularly in the presence of sulfuric acid. Among the solvents tested, n-butanol demonstrated the highest extraction efficiency. The phosphoric acid concentration was increased to 56%–63% P₂O₅, with sulfuric acid impurity levels reduced to ≤ 0.002%. Discussion: The results of the study demonstrate a significant contribution to the field of optimizing phosphoric acid extraction using organic solvents. One of the innovative aspects of the work is the analysis of extraction mechanisms using various solvents, including n-butanol, tributyl phosphate, and isoamyl phosphate. This contribution significantly expands the scientific understanding of extraction processes and opens up new possibilities for optimizing phosphoric acid purification technology. Conclusion: For the first time, countercurrent extraction and azeotropic distillation were combined to address the issue of equipment corrosion caused by fluorine impurities. The findings of this study can be applied in developing a fundamental technological process for the deep purification of technical-grade phosphoric acid, resulting in the production of pure and highly concentrated phosphoric acid.

The article presents the results of research on the production of effective inorganic fillers and chemically resistant composite polymer-mineral materials based on industrial waste. The aim of the work is to develop the technological foundations for the production of inorganic fillers and highly filled filling compositions for use in chlorine-containing media. Materials with high resistance to hydrochloric acid are graphite and quartz sand. Thermal power plant (TPP) ash was used as an acid-resistant filler in the compositions. The simplex lattice planning method was used to determine the areas of compositions with the best properties. Two components were selected: formaldehyde rubber resin and mineral filler (TPP ash) as a binder. As the third component, hydrolytically active fillers were used - anhydrite, phosphogypsum and phosphorus production slag. A preliminary operation was performed to remove hygroscopic moisture from the filler.The influence of the nature of mineral fillers on the chemical stability and durability of the obtained composites is investigated. The nature of the interaction of mineral fillers with a polymer binder was determined, and chemical interaction of the hydroxyl groups of the filler and the methyl groups of the polymer took place. The mathematical planning method was used to optimize the chemical resistance and durability of the compositions of the studied substances. Based on the results of this study, optimal compositions of compositions, anhydrite, phosphogypsum and phosphoric slag were selected. These composites, with the highest possible degree of filling, have high target characteristics.