Patent ID: 6774256
Filing Date: 2004-08-10
Classification: B01J,C07C,C07D,C08G,Y02P

Abstract:
An integrated process for the production of a dialkyl carbonate and a diol from an alkylene oxide, carbon dioxide and an aliphatic monohydric alcohol comprising:(a) reacting an alkylene oxide with carbon dioxide in the presence of a carbonation catalyst which is [1,1â€²(1-butylbenzimidzol-2yl)pentane]copper(II) di(trifluoromethanesulfonate) at a temperature in the range of about 50Â° C. to 250Â° C. and at a pressure of at least about 1379 kPa (200 psi) to provide a crude cyclic carbonate stream comprising a cyclic carbonate and said catalyst; and (b) reacting said cyclic carbonate with said aliphatic monohydric alcohol in the presence of said catalyst to provide a crude product stream comprising said dialkyl carbonate and said diol, wherein said crude product stream exhibits a halogen concentration of about 5 ppm or less.