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. 31, 2012
Filed:
May. 12, 2009
Lubo Zhou, Inverness, IL (US);
Chunqing Liu, Schaumburg, IL (US);
Carlos A. Cabrera, Northbrook, IL (US);
Peter K. Coughlin, Mundelein, IL (US);
Lubo Zhou, Inverness, IL (US);
Chunqing Liu, Schaumburg, IL (US);
Carlos A. Cabrera, Northbrook, IL (US);
Peter K. Coughlin, Mundelein, IL (US);
UOP LLC, Des Plaines, IL (US);
Abstract
The present invention involves the use of a multi-stage membrane system for gas, vapor, and liquid separations. In this multi-stage membrane system, high selectivity and high permeance or at least high selectivity polybenzoxazole membranes or cross-linked polybenzoxazole membranes are applied for a pre-membrane or both the pre-membrane and the secondary membrane. A primary membrane can be from conventional glassy polymers. This multi-stage membrane system can reduce inter-stage compression cost, increase product recovery and product purity for gas, vapor, and liquid separations. It can also save the cost compared to the system using all the high cost polybenzoxazole membranes or cross-linked polybenzoxazole membranes.