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:
Sep. 10, 2002
Filed:
Mar. 11, 2002
Applicant:
Inventors:
Gary R. Strickler, Midland, MI (US);
Guo-Shuh J. Lee, Midland, MI (US);
William J. Rievert, Beaverton, MI (US);
Daniel J. LaPrairie, Beaverton, MI (US);
Edward E. Timm, Freeland, MI (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 2/700 ;
U.S. Cl.
CPC ...
C07C 2/700 ;
Abstract
The present invention relates to a catalytic process for the preparation of alkylene glycols from alkylene oxide and water. Further, the invention relates to a method of preservation of catalysts in alkylene oxide containing systems. More in particular, it has been found that polycarboxylic acids, preferably oxalic acid, have a positive effect on the lifetime of catalyst systems based on anion exchange resins, and particularly those in the bicarbonate and oxalate forms.