Two tank approach pervaporation1/7/2024 Separation of non-ideal azeotrope-containing mixtures is often complex and serious challenge. In many cases, they form an azeotrope that cannot be separated by conventional distillation methods. Liquid mixtures are often non-ideal, with very different behaviour from the ideal. Separation of liquid waste mixtures is a field that has been significantly and thoroughly studied not only for environmental engineering but also for other engineering sciences. Furthermore, the pervaporation supplemented with dynamic tanks is not favourable due to the high recirculation rate in the case of tested mixtures and compositions. It can be stated the last solution in line was the most suitable in the terms of composition, however distillation of mixture with high water content has significant heat consumption. Eight different methods were built up in ChemCAD flowsheet simulator: organophilic pervaporation (OPV), hydrophilic pervaporation (HPV), hydrophilic pervaporation with recirculation (R-HPV), dynamic organophilic pervaporation (Dyn-OPV), dynamic hydronophilic pervaporation (Dyn-HPV), hybrid distillation-organophilic pervaporation (D + OPV), hybrid distillation-hydrophilic pervaporation (D + HPV), and finally hybrid distillation-hydrophilic pervaporation with recirculation (R-D + HPV). Alcohol-containing process wastewaters were investigated in professional process simulator environment with user-added pervaporation modules. In the present work, the membrane process considered as an alternative pervaporation is demonstrated through the treatment of low alcohol (methanol and ethanol) aqueous mixtures. The distillation technique proves to be a good solution in many cases, but in the case of mixtures with high water content and few volatile components, this process is often not cost-effective due to its high steam consumption, and in the case of azeotropic mixtures there are separation constraints. There is need to develop regeneration processes that are financially beneficial to the plant and, if possible, reuse the liquid waste in the spirit of a circular economy, in a particular technology, or possibly elsewhere. Addressing these is a key issue because their disposal often accounts for the largest proportion of the cost of the entire technology. It can be stated that in the fine chemical industries, especially in the pharmaceutical industry, large amounts of liquid waste and industrial waste solvents are generated during the production technology.
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