Process for the preparation of pure tert.-olefins

US4409421A · kind A · utility

Assignees

• EC Erdolchemie GmbH · DE
• BAYER HEALTHCARE LLC · DE

Inventors

• Jens Herwig · Cologne, DE
• Bruno Schulwitz · Cologne, DE
• Bernhard Schleppinghoff · Dormagen, DE
• Hans-Volker Scheef · Dormagen, DE
• Peter M. Lange · Leverkusen, DE

Key dates

• Filing date: Jun 4, 1982
• Grant date: Oct 11, 1983
• Expiry date: Jun 4, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/14891
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Pure tert.-olefins are prepared from mixtures of hydrocarbons, which contain at least one such tert.-olefin, by reaction with an alkanol to give the corresponding alkyl tert.-alkyl ethers, and subsequent cleavage of these ethers back to the corresponding pure tert.-olefins and the alkanol, and the separation of the pure tert.-olefin from the alkanol. For this, the alkanol present after the cleavage of the ether is separated from the tert.-olefin to the extent of 60 to 99% by weight by distillation, and the residual amount of alcohol in the olefin fraction is removed by adsorption from this fraction onto a synthetic ion exchanger as an absorber resin. The admixture of the alkanol to the mixture of hydrocarbons with at least one tert.-olefin is carried out partly by using the alkanol fraction arising from the separating off of the pure tert.-olefin, and partly by desorption of the alkanol from the absorber resin with the aid of the mixture of hydrocarbons containing at least 1 tert.-olefin.