公开(公告)号：DE1910473A1

公开(公告)日：1970-09-17

申请号：DE1910473

申请日：1969-03-01

Applicant: BASF AG

Inventor： KARL SCHLOEMER DR ,  OTTO NAGEL DR-ING ,  ROLF PLATZ DR ,  HANS-MARTIN WEITZ DR

IPC: C07C7/148 ,  C07C7/171 ,  C07C7/02

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.

公开(公告)号：DE1443535A1

公开(公告)日：1968-10-24

申请号：DE1443535

申请日：1964-08-12

Applicant: BASF AG

Inventor： HUGO KROEPER DR ,  HANS-MARTIN WEITZ DR ,  ROLF PLATZ DR ,  KARL SCHLOEMER DR

IPC: C07C67/04 ,  C07C69/54

Abstract: Tertiary alkyl acrylates or methacrylates of the formula wherein R1 denotes an H atom or the -CH3 group and the R2 radicals which may be the same or different denote an alkyl group having from 1 to 4 C atoms, are prepared by reacting acrylic or methacrylic acid with a tertiary olefin of formula where R2 has the above meaning and R3 denotes an alkylidene group with 1 to 4 C atoms, in the presence of an active bleaching earth containing from 0.005 to 0.1 milliequivalents per gram of free titratable acid at atmospheric or superatmospheric pressure and at a temperature of from 0 DEG C. to 40 DEG C. A suitable bleaching earth comprises 50 to 70% of SiO2, 10 to 30% of Al2O3, 2 to 8% of Fe2O3, 1 to 9% of MgO and small amounts of the oxides of the other alkaline earth metals (all percentages are by weight). Examples describe the production of tertiary-butyl acrylate.