公开(公告)号：CA929961A

公开(公告)日：1973-07-10

申请号：CA76135

申请日：1970-02-27

Applicant: BASF AG

Inventor： SCHLOEMER K ,  WEITZ H ,  PLATZ R ,  NAGEL O

IPC: C07C7/148 ,  C07C7/171

Abstract: 1290072 Recovering isobutylene and butadiene BADISCHE ANILIN- & SODA-FABRIK AG 27 Feb 1970 [1 March 1969] 9508/70 Heading C5E Isobutylene and butadiene are recovered from C 4 -hydrocarbon mixture containing inter alia isobutylene and 0À01-60 wt. per cent butadiene by the following steps:- (a) contact at 25-35‹ C. with an absorption mixture containing 2-25 wt. per cent tert.- butanol, 30-45 wt. per cent sulphuric acid and 30-55 wt. per cent water, whereby isobutylene is hydrated to form more tert.-butanol, most of the butadiene being recovered as raffinate gas; (b) distilling the resulting mixture to obtain an azeotrope of tert.-butanol with about 12% of water; (c) fractionating the azeotrope to obtain a pure fraction comprising not more than 0À03 wt. per cent of impurities; and (d) dehydrating tert.-butanol contained in said pure fraction by contact with active alumina.