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:
May. 27, 2008
Filed:
Mar. 05, 2004
Jan W. Verwijs, Hoek, NL;
John W. Weston, Sugar Land, TX (US);
Walter J. S. Papadopulos, Antwerp, BE;
Richard J. Elwell, Stade, DE;
Carlos M. Villa, Lake Jackson, TX (US);
Jan W. Verwijs, Hoek, NL;
John W. Weston, Sugar Land, TX (US);
Walter J. S. Papadopulos, Antwerp, BE;
Richard J. Elwell, Stade, DE;
Carlos M. Villa, Lake Jackson, TX (US);
Dow Global Technologies Inc., Midland, MI (US);
Abstract
A continuous process and system for producing polyether polyols that allows for continuously adding an unreacted oxide to a loop reactor while adding at least one thermally deactivating catalyst capable of thermally deactivating prior to decomposition of polyether polyol which can allow for greater concentrations of unreacted oxides and/or a rate of reaction in the loop reactor is at a rate at least two times faster than a rate of reaction in a loop reactor containing less than 14 weight percent unreacted oxide. In a preferred embodiment, the catalyst is a double metal cyanide catalyst and a plug flow reactor is formed in series with the loop reactor wherein neither reactor contains a vapor space.