The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 1986
Filed:
Sep. 10, 1984
Applicant:
Inventor:
Michael S Spencer, Stockton-on-Tees, GB;
Assignee:
Imperial Chemical Industries PLC, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
558277 ; 210691 ;
Abstract
A solution of a di-alkyl carbonate, e.g. dimethyl carbonate, in the corresponding alcohol, e.g. methanol, is concentrated by contacting the solution with a hydrophobic zeolite e.g. silicalite. The di-alkyl carbonate is absorbed preferentially. Where the solution also contains water, e.g. as in the case of the products from certain di-alkyl carbonate synthesis reactions, the water can be removed using a hydrophilic zeolite prior to recycle of the alcohol.