Georgia Tech Research Corporation

Dow Global Technolgoies LLC

Wulin Qiu

William John Koros

Liren Xu

Mark K Brayden

Marcos V Martinez

Justin Tyler Vaughn

Thomas Fitzgibbons

Kuang Zhang

William J Koros

Mark M Brayden

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&#xb0; C. or 30&#xb0; C. to about 20&#xb0; C.). The CMS membrane is then reheated to a reheating temperature of at least 250&#xb0; C. to 400&#xb0; 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).

Method of making carbon molecular sieve membranes

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&#xb0; C. or 30&#xb0; C. to about 20&#xb0; C.). The CMS membrane is then reheated to a reheating temperature less than the pyrolysis temperature to form the improved CMS membrane. The improved CMS membranes have shown an improved combination of selectivity and permeance as well as stability for separating hydrogen from gas molecules (e.g., methane, ethane, propane, ethylene, propylene, butane, carbon dioxide, nitrogen, butylene, and combinations thereof).

The present invention relates to functionalized polymeric sorbents and processes of employing them to remove low level contaminants from fluid streams. Poly(glycidyl methacrylate-co-trimethylolpropane trimethacrylate) functionalized with a compound having the structure NH&#x2014;ROH wherein Ris a substituted or unsubstituted phenylene may be particularly useful to remove low levels of phenol compounds from, for example, an aqueous fluid stream comprising one or more sugars such as results from a hydrolysis of lignocellulosic materials.

Polymeric sorbents for removing low level contaminants

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Snellville, GA, United States of America

Wulin Qiu