公开(公告)号：US20200254393A1

公开(公告)日：2020-08-13

申请号：US16634401

申请日：2018-03-20

Applicant: Dow Global Technologies LLC

Inventor： Liren Xu ,  Rahul Sharma ,  Thomas Fitzgibbons ,  Mark K. Brayden ,  Marcos V. Martinez

IPC: B01D67/00 ,  B01D53/22 ,  B01D71/02 ,  B01D69/08 ,  C07C7/144

Abstract: A method of making a hollow fiber carbon molecular sieve is comprised of heating a hollow polymer fiber to a carbonization temperature in an atmosphere that is non-oxidizing to form a hollow fiber carbon molecular sieve, wherein during at least a portion of the heating a tensile force is applied to the hollow polymer fiber. The method may improve the separation of gases similar in size such a propylene from propane.

公开(公告)号：US20180369761A1

公开(公告)日：2018-12-27

申请号：US16062118

申请日：2016-11-30

Applicant: Dow Global Technologies LLC ,  Georgia Tech Research Corporation

Inventor： John Hessler ,  William J. Koros ,  Liren Xu ,  Mark K. Brayden ,  Marcos V. Martinez

IPC: B01D71/02 ,  B01D67/00

Abstract: The invention is an improved method of making a carbon molecular sieve (CMS) membrane in which a precursor polymer is pyrolyzed to form a carbon molecular sieve membrane that is then exposed to a conditioning atmosphere comprised of a target permeate gas molecule such as ethylene when the membrane is desired to separate it from a light hydrocarbon gas stream. The exposure to the ethylene desirably occurs prior to the CMS permeance and selectivity combination substantially changing (e.g., within 5 days) of cooling from the pyrolyzing temperature. The CMS membranes have shown an improved combination of selectivity and permeance as well as stability and are useful to separate gases in gas streams such methane from natural gas, oxygen from air and ethylene or propylene from light hydrocarbon streams.

公开(公告)号：US20150053079A1

公开(公告)日：2015-02-26

申请号：US14391014

申请日：2013-04-29

Applicant: DOW GLOBAL TECHNOLOGIES LLC ,  GEORGIA TECH RESEARCH CORPORATION

Inventor： William J. Koros ,  Liren Xu ,  Mark K. Brayden ,  Marcos V. Martinez ,  Brien A. Stears

IPC: B01D53/22 ,  B01D67/00 ,  B01D69/08 ,  B01D71/02 ,  B29C47/00 ,  B29D22/00

CPC classification number: B01D53/228 ,  B01D67/0067 ,  B01D67/0088 ,  B01D67/0097 ,  B01D69/08 ,  B01D69/087 ,  B01D71/021 ,  B01D71/42 ,  B01D2323/08 ,  B01D2323/22 ,  B01D2325/20 ,  B29C47/0004 ,  B29D22/00 ,  B29K2023/00 ,  B29K2091/00

Abstract: A hollow fiber carbon molecular sieve membrane, a process for preparing the hollow fiber carbon molecular sieve membrane, and a process for effecting separation of an olefin from a gaseous mixture that comprises the olefin in admixture with its corresponding paraffin and optionally one or more gaseous components selected from hydrogen, an olefin other than the olefin and a paraffin other than the corresponding paraffin. The process and membrane may also be used to effect separation of the olefin(s) from remaining feedstream components subsequent to an olefin-paraffin separation.

Abstract translation: 中空纤维碳分子筛膜，中空纤维碳分子筛膜的制备方法以及将烯烃与其相应的链烷烃和任选的一种或多种气体组分混合的气态混合物分离的方法 选自氢气，除烯烃以外的烯烃和除相应石蜡以外的石蜡。 该方法和膜也可用于在烯烃 - 石蜡分离之后使烯烃与剩余的进料流组分分离。