Patent ID: 6863778
Filing Date: 2005-03-08
Classification: B01D,C07C,Y10S

Abstract:
1. A process for separating diisobutylene from tertiary butyl alcohol comprising the steps of: (a) feeding a stream comprising diisobutylene and tertiary butyl alcohol to a first distillation zone operated at a first pressure and under conditions to remove diisobutylene as a first bottoms and maintain a first azeotrope of diisobutylene and tertiary butyl alcohol within the first distillation zone above the bottoms but below the overheads; (b) withdrawing said first azeotrope from said first distillation zone; and (c) feeding said first azeotrope to a second distillation zone operated at a second pressure lower than said first pressure and under conditions to remove tertiary butyl alcohol as a second bottoms and taking a second azeotrope of diisobutylene and tertiary butyl alcohol as overheads, said second azeotrope having less tertiary butyl alcohol that said first azeotrope.