[특허]High purity membrane nitrogen

High purity membrane nitrogen 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01D-053/22
출원번호	US-0996981 (1992-12-21)
발명자 / 주소	Prasad Ravi (East Amherst NY)
출원인 / 주소	Praxair Technology, Inc. (Danbury CT 02)
인용정보	피인용 횟수 : 34 인용 특허 : 0

초록

Multi-stage membrane systems are arranged so that, with the same number of modules and compressors, mixing losses upon combining recycle and feed streams are minimized. Membrane surface area and power requirements are reduced thereby.

대표청구항 ▼

An improved membrane process for the production at high or very high purity, of a less selectively permeable component of a feed gas containing said component and a more selectively permeable component, comprising: (a) introducing the feed gas at a feed pressure to a first stage membrane module of a membrane system containing a total of at least three membrane module stages, said system being capable of selectively permeating the more selectively permeable component thereof; (b) separately removing the less selectively permeable component from the first stage essentially at the feed pressure as retentate, and the more selectively permeable component therefrom at a pressure lower than the feed pressure as permeate; (c) passing the retentate from the first stage to succeeding stages in series, essentially at the feed pressure, as feed gas thereto; (d) separately removing the retentate from each said stage in series essentially at the feed pressure, and the permeate therefrom at a pressure lower than the feed pressure, the retentate from the last stage in series being recovered as high or very high purity gas, without non-membrane treatment for the removal of residual amounts of permeate therein; (e) compressing the permeate from the last stage in series and passing said permeate to an additional membrane module stage as feed gas therefor; and (f) recycling retentate from said additional membrane module stage for blending with the retentate from the next-to-last-stage in series and for passage to the last stage in series, the stage cut of the additional membrane module stage being such that the retentate therefrom has essentially the same composition as the retentate from the next-to-last stage, whereby the less selectively permeable component is advantageously recovered as a high or very high purity product at advantageously low membrane surface area and power requirements.

이 특허를 인용한 특허 (34)

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Baker Richard W. ; Lokhandwala Kaaeid A. ; Pinnau Ingo, Ethylene/nitrogen separation process.
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Pittroff, Michael; Schwarze, Thomas; Belt, Heinz-Joachim, Isolation of SF6 from insulating gases in gas-insulated lines.
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Jensvold John A. ; Jeanes Thomas O., Membrane for separation of xenon from oxygen and nitrogen and method of using same.
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Douglas Gottschlich ; Matthew Ringer, Membrane gas separation process with compressor interstage recycle.
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Callahan, Richard A., Membrane technology to reduce nitrogen in natural gas.
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Ishihara, Yoshio; Hayashida, Shigeru; Nagasaka, Toru; Kimijima, Tetsuya; Ohmi, Tadahiro, Method and apparatus for collecting rare gas.
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De Wilde Robert Marcel,BEX ; Duro Pascal Yves,FRX, Method and system for inerting polymeric film producing machines.
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Behling Rolf-Dieter,DEX ; Peinemann Klaus-Viktor,DEX ; Ohlrogge Klaus,DEX ; Wind Jan,DEX ; da Silva Lidia Barreto,BRX, Multi-stage process for the separation/recovery of gases.
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Wilcox, Jennifer, Nitrogen-permeable membranes and uses thereof.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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High purity membrane nitrogen 원문보기

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