Add time:07/31/2019         Source:sciencedirect.com

Excess tert-butyl alcohol is generally used to promote the etherification reaction for production of glycerol ether. However, the difficulty in recovering this excess alcohol is caused by the presence of an azeotropic mixture of tert-butyl alcohol and water, a by-product from the etherification. This work proposes a recovery process of tert-butyl alcohol consisting of extractive distillation and conventional distillation columns. Feasible organic and ionic liquid solvents are firstly screened through such criteria as environmental concern and thermodynamic insight. Then, simulations of the extractive and distillation system for tert-butyl alcohol recovery are performed based on the suitable selected solvents, i.e., 3-octanone, hexyl acetate and 2-heptanone. From the techno-economic assessment, hexyl acetate is the most suitable solvent and the optimal configuration and operation of the process are also presented. Regarding the environmental impact indicator, hexyl acetate is also considered the most suitable solvent due to the lowest requirement of solvent.

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