Patent ID: 8143440
Filing Date: 2012-03-27
Classification: C07C

Abstract:
1. A method for separating and collecting at least alcohol from an azeotropic mixture of olefin and alcohol, which comprises: an azeotropic mixture crystallization step of subjecting an azeotropic mixture of alcohol and olefin represented by a following formula: wherein Rf is a linear perfluoroalkyl group having 1 to 10 carbon atoms, to a crystallization procedure to separate the azeotropic mixture into an olefin portion having a higher olefin concentration than that of the original azeotropic mixture and an alcohol portion having a higher alcohol concentration than that of the original azeotropic mixture; and an alcohol purification step of subjecting the separated alcohol portion to either a crystallization procedure or a distillation procedure to separate the alcohol portion into a low-alcohol portion having a lower alcohol concentration than that of the original alcohol portion and a high-alcohol portion having a higher alcohol concentration than that of the original alcohol portion, and thereby collecting alcohol as the high-alcohol portion.