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:
Jun. 06, 2023
Filed:
Apr. 03, 2019
Dow Global Technologies Llc, Midland, MI (US);
Georgia Tech Research Corporation, Atlanta, GA (US);
Liren Xu, Spring, TX (US);
Thomas Fitzgibbons, Lake Jackson, TX (US);
Mark K. Brayden, Plaquemine, LA (US);
Marcos V. Martinez, Freeport, TX (US);
William J. Koros, Atlanta, GA (US);
Wulin Qiu, Snellville, GA (US);
Dow Global Technologies LLC, Midland, MI (US);
Georgia Tech Research Corporation, Atlanta, GA (US);
Abstract
The invention is an improved method of making an improved carbon molecular sieve (CMS) membrane in which a precursor polymer (e.g., polyimide) is pyrolyzed at a pyrolysis temperature to form a CMS membrane that is cooled to ambient temperature (about 40° C. or 30° C. to about 20° C.). The CMS membrane is then reheated to a reheating temperature of at least 250° C. to 400° C. to form the improved CMS membrane. The CMS have a novel microstructure as determined by Raman spectroscopy. The improved CMS membranes have shown an improved combination of selectivity and permeance as well as stability for separating light hydrocarbon gas molecules such as Cto Chydrocarbon gases (e.g., methane, ethane, propane, ethylene, propylene, butane, butylene).