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. 03, 1996
Filed:
Feb. 28, 1994
Applicant:
Inventors:
Te Chang, West Chester, PA (US);
Stephen H Harris, Kennett Square, PA (US);
Assignee:
ARCO Chemical Technology, L.P., Greenville, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
203 64 ; 203 78 ; 203 80 ; 203D / ; 568697 ; 568699 ;
Abstract
A process for making and purifying dipropylene glycol tert-butyl ethers (DPTB). DPTB is made by reacting dipropylene glycol with isobutylene in the presence of an acidic catalyst. Extractive distillation of the product mixture using a glycol extracting agent, preferably dipropylene glycol, allows removal of di-tert-butyl ether impurities as an overhead product. The DPTB product is then distilled to separate it from the glycol extracting agent. High-purity DPTB, substantially free of diethers and exceptionally useful as a solvent, is obtained from the process.