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:
Oct. 18, 2022
Filed:
Apr. 25, 2017
Dow Global Technologies Llc, Midland, MI (US);
Georgia Tech Research Corporation, Atlanta, GA (US);
Yu-Han Chu, Atlanta, GA (US);
William J. Koros, Atlanta, GA (US);
Liren Xu, Pearland, TX (US);
Mark K. Brayden, Baton Rouge, LA (US);
Marcos V. Martinez, Rosharon, TX (US);
Dow Global Technologies LLC, Midland, MI (US);
Georgia Tech Research Corporation, Atlanta, GA (US);
Abstract
A carbon molecular sieve (CMS) membrane having improved separation characteristics for separating olefins from their corresponding paraffins is comprised of carbon with at most trace amounts of sulfur and a transition metal, wherein the transition metal is one or more of a group 4-10 and 12 transition metal. The CMS membrane may be made by pyrolyzing a precursor polymer devoid of sulfur in which the precursor polymer has had a transition metal incorporated into it. The pyrolyzing for the precursor having the transition metal incorporated into it is performed in a nonoxidizing atmosphere and at a heating rate and temperature such that the metal has a valence greater than zero (i.e., not metal bonded) to a valence desirably closer to its maximum valence.