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:
Jul. 28, 1992
Filed:
Jul. 25, 1991
Applicant:
Inventor:
T Thomas Shih, Bryn Mawr, PA (US);
Assignee:
Arco Chemical Technology, L.P., Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C07D / ;
U.S. Cl.
CPC ...
203 64 ; 203 70 ; 203 75 ; 203 80 ; 203D / ; 549541 ;
Abstract
The present invention provides an improved process for the separation of impurities from a lower alkylene oxide, such as propylene oxide, by a process wherein the impure propylene oxide is first fractionally distilled to separate higher and lower boiling impurities, then the partially purified alkylene oxide is subjected to extractive distillation to separate additional impurities, the purified propylene oxide being separated as an overhead fraction.