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. 03, 2016
Filed:
Dec. 04, 2014
Uop Llc, Des Plaines, IL (US);
Carl W. Liskey, Chicago, IL (US);
Chunqing Liu, Arlington Heights, IL (US);
Howie Q. Tran, Skokie, IL (US);
Nicole K. Karns, Chicago, IL (US);
UOP LLC, Des Plaines, IL (US);
Abstract
A copolyimide polymer membrane is provided for separation of hydrocarbons including separation of olefins from paraffins and isoparaffins from other paraffins. The copolyimide polymer membranes include a poly(3,3'-diaminobenzophenone-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline-pyromellitic dianhydride) (abbreviated as poly(DAB-TMMDA-PMDA)). The copolyimide membranes prepared from poly(DAB-TMMDA-PMDA) with varying molar ratios of DAB to TMMDA (abbreviated as PI-DAB-T) showed excellent separation properties for propylene/propane separation.