Method for separation of olefin-alcohol azeotropic mixture

Abstract

There is provided a method for separating and collecting at least alcohol with a high purity from an azeotropic mixture of olefin and alcohol. The method conducts the following steps: an azeotropic mixture crystallization step of subjecting an azeotropic mixture of alcohol and olefin represented by the formula: RfCH═CH2 [wherein Rf represents a linear perfluoroalkyl group having 1 to 10 carbon atoms] to a crystallization procedure to separate the 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.

Dependencies are inferred from the claim text.