Patent ID: 9309177
Filing Date: 2016-04-12
CPC Classification: B01D,C07C

Claim Text:
1. A process for the preparation of acetals or ketals which comprises: (i) reacting an aldehyde or ketone with an alcohol in the presence of a solid acid at a reaction temperature of between about −80° C. to about −45° C. to form a reaction product mixture, and (ii) removing water and methanol from the reaction product mixture by pervaporation, wherein step (ii) includes removing the water from the reaction product mixture by bringing the reaction product mixture into contact with a first membrane having a flux density for water of 0.04 to 2.8 kg/(hm step (ii) is practiced under a temperature condition of about 60° C. to about 150° C. and under pressure conditions of a pressure on a retentate side of the membrane of up to 16 bar and a pressure on a permeate side of the membrane of about 1 to 500 mbar.