Mixed matrix membranes and methods for making the same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/22
출원번호
US-0834857
(2001-04-12)
발명자
/ 주소
Koros, William J.
Vu, De Q.
Mahajan, Rajiv
Miller, Stephen J.
출원인 / 주소
The University of Texas System, Chevron U.S.A. Inc.
대리인 / 주소
Schulte, Richard J.
인용정보
피인용 횟수 :
37인용 특허 :
24
초록▼
Mixed matrix membranes capable of separating carbon dioxide from mixtures including carbon dioxide and methane, and processes for purifying methane using the membranes, are disclosed. The membranes are preferably polymer membranes that include discrete carbon-based molecular sieve particles with siz
Mixed matrix membranes capable of separating carbon dioxide from mixtures including carbon dioxide and methane, and processes for purifying methane using the membranes, are disclosed. The membranes are preferably polymer membranes that include discrete carbon-based molecular sieve particles with sizes of between about 0.5 microns to about 5.0 microns. The particles are formed by pyrolyzing a precursor polymer in the form of a powder or film. The pyrolyzed polymer is then ideally milled to desired small size particles. The preferred ratio of particles to polymer is about 0.25 to about 1.0 by volume. A preferred method for preparing the mixed matrix membrane is by dispersing the particles in a solvent, adding a small quantity of the desired polymer or "sizing agent" to "size" or "prime" the particles, adding a polymer, casting a film of the polymer solution, and evaporating the solvent to form a mixed matrix membrane film. The mixed matrix membrane film permits passage of carbon dioxide and methane, but at different permeation rates, such that the ratio of the relative permeation rates of carbon dioxide to methane is larger through the mixed matrix membrane film than through the original polymer. The mixed matrix membrane is preferably in the form of a dense film or a hollow fiber. A mixture containing carbon dioxide and methane can be enriched in methane by selective passage of carbon dioxide over methane in a gas-phase process through the membrane.
대표청구항▼
Mixed matrix membranes capable of separating carbon dioxide from mixtures including carbon dioxide and methane, and processes for purifying methane using the membranes, are disclosed. The membranes are preferably polymer membranes that include discrete carbon-based molecular sieve particles with siz
Mixed matrix membranes capable of separating carbon dioxide from mixtures including carbon dioxide and methane, and processes for purifying methane using the membranes, are disclosed. The membranes are preferably polymer membranes that include discrete carbon-based molecular sieve particles with sizes of between about 0.5 microns to about 5.0 microns. The particles are formed by pyrolyzing a precursor polymer in the form of a powder or film. The pyrolyzed polymer is then ideally milled to desired small size particles. The preferred ratio of particles to polymer is about 0.25 to about 1.0 by volume. A preferred method for preparing the mixed matrix membrane is by dispersing the particles in a solvent, adding a small quantity of the desired polymer or "sizing agent" to "size" or "prime" the particles, adding a polymer, casting a film of the polymer solution, and evaporating the solvent to form a mixed matrix membrane film. The mixed matrix membrane film permits passage of carbon dioxide and methane, but at different permeation rates, such that the ratio of the relative permeation rates of carbon dioxide to methane is larger through the mixed matrix membrane film than through the original polymer. The mixed matrix membrane is preferably in the form of a dense film or a hollow fiber. A mixture containing carbon dioxide and methane can be enriched in methane by selective passage of carbon dioxide over methane in a gas-phase process through the membrane. French). The National Institute of Neurological Disorders and Stroke rt-PA Stroke study Group, "Tissue plasminogen activator for acute ischemic stroke," N. Engl.J. Med. 333(24):1581-1587, 1995. The publications committee for the trail of ORG 10172 in acute stroke Treatment (TOAST) Investigators, JAMA 279(16):1265-1272, Apr. 1998. Today's News, "Radiant medical announces data from therapeutic cooling trial for heart attack presented at American Heart Association meeting," Source: http://www.radiantmedical.com, located on Nov. 26, 2001. Xue, D., Z-G. Huang, K. E. Smith, and A. M. Buchan, "Immediate or delayed mild hypothermia prevents focal cerebral infarction," Brain Research 587:66-72, 1992.
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