Pervaporation process for separating alcohols from ethers

Details Pervaporation process for separating alcohols from ethers Pervaporation process for separating alcohols from ethers

C - Chemistry, Metallurgy

07

C

202/62, 260/648,

C07C 1/20 (2006.01) B01D 61/36 (2006.01) C07C 41/06 (2006.01) C07C 41/34 (2006.01) C07C 43/04 (2006.01)

Patent

CA 1303068

270-P-US03778 ABSTRACT The present invention is an improved process for separating alcohols from ethers and/or hydrocarbon raffinate in an etherification process. The excess alcohol reactant which forms azeotrope mixtures with the product ethers and C4-C7 raffinate, is removed by passing the liquid azeotrope mixture over a pervaporation membrane which effectively breaks the azeotrope and permeates the alcohol with high flux and high selectivity. In a typical etherification process, one or more pervaporation membrane units can be located ahead of the ether/raffinate distillation step, in conjunction with the distillation step with a liquid side draw, after the distillation step, or a combination of any of the above. The present invention also provides an improved process for separating alcohols from ethers and/or hydrocarbon raffinate in an ether decomposition process for the production of high purity iso-alkene products. In this embodiment, one or more pervaporation membranes are used to recover alcohols from the decomposition product stream.

583553

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