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Influence of entrainer recycle for batch heteroazeotropic distillation

Frontiers of Chemical Science and Engineering 2018年第4期12卷 643-659页

作者： Laszlo Hegely Peter Lang Department of Building Service and Process Engineering Faculty of Mechanical Engineering Budapest University of Technology and EconomicsMuegyetem rkp.3-9Hungary

Dehydration of isopropanol applying batch heteroazeotropic distillation with toluene as entrainer (E) is investigated. The composition of the feed is near to that of the isopropanol (A)-water (B) azeotrope. The effects of recycling the entrainer and the off-cut are studied by dynamic simulation with a professional flow-sheet simulator. Three consecutive batches (one production cycle) is studied. Both operational modes (Mode I: decantation after distillation and Mode II: decantation during distillation) are simulated. For Mode II, calculations are performed both for Strategy A (distillate from the aqueous (E-lean) phase only) and Strategy B (partial withdrawal of the organic (Erich phase), as well). The E-rich phase, the final column hold-up and the off-cut (Mode II only) are recycled to the next batch. The influence of the following parameters are determined: quantity of entrainer, reflux ratios of the steps. The variations caused by the recycling in the 2(nd) and 3(rd) batches are also shown. The best results (lowest specific energy demand and highest recovery of A) are obtained by Mode II, Strategy A. Recycling increases the recovery, and drastically diminishes the entrainer consumption. However, it makes the production slower and decreases the quantity of fresh feed that can be processed.

关键词： batch distillation heteroazeotropic distillation operational policies off-cut recycle entrainer

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EFFECTS OF entrainerS ON THE PHASE EQUILIBRIUM OF SUPERCRITICAL FLUID EXTRACTION PROCESS

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Chinese Journal of Chemical Engineering 1993年第4期1卷 54-61页

作者：张建君朱美文于恩平张泽廷

A flow apparatus was set up for measuring the solubility of a solid solute in a supercritical fluid withthe presence of a small amount of *** solubilities of biphenyl,diphenylamine and benzoic acid insupercritical carbon dioxide with one of the selected entrainers which were ethanol,acetone and n-hexanerespectively,were obtained in the pressure range of 10—32 MPa and the temperature range of 308—*** association theory has been proposed to explain the mechanism of entrainer effect,and theexperimental results were reasonably *** to the solvolytic association theory,the association equa-tion of state was adopted to correlate the experimental data with good accuracy.

关键词： entrainer phase equilibrium supercritical fluid extraction solubility

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Study on CO_2-supercritical fluid extraction used to extract three kinds of tanshinones from the root of salvia meltiorrhiza bunge with different entrainers

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Journal of Nanjing Medical University 2006年第2期20卷 83-85页

作者： Guozhang Li Huazhong Yu Xiaoying Bu Yong Cao Liqun Rao Key Laboratory of Hunan Forest Product and Chemical Industry Engineering Jishou University Zhangjiajie 427000 China College of Biological Science and Technology HNAU Changsha 410128China

Objective： To extract three kinds of tanshinones from the root of Salvia miltiorrhiza Bunge by CO2-supercdtical fluid extraction technology with different entrainers at different flow rates, and to investigate the effects of different entrainers. Methods： Three kinds of tanshinones were extracted at the optimal operation condition, and the massconcentrafion of three kinds of tanshinones in the extracts was determined by HPLC. Results： Among the three enu＇ainers, the extracting effects of ethanol is the best, for the stronger polarity, followed by ethanol and normal octane. Conclusion： To increase the extracting rate of three kinds of tanshinones by CO2- supewrifical fluid extraction technics, it is essential to use polar solvent as entrainer.

关键词： tanshinones CO2-SF extraction entrainer extraction effect

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