IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0585230
(1990-09-19)
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발명자
/ 주소 |
- Reddy Damoder (San Ramone CA) Denslow Keith (Midland MI)
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| 출원인 / 주소 |
- The Dow Chemical Company (Midland MI 02)
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| 인용정보 |
피인용 횟수 :
54 인용 특허 :
0 |
초록
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The present invention relates to a spiral-wound membrane module having a semi-permeable membrane which has a central high pressure premeatae region flanked on opposite sides by two lower pressure edge portions. The edge portions facilitate the dispersion of and the collection of the feed fluid being
The present invention relates to a spiral-wound membrane module having a semi-permeable membrane which has a central high pressure premeatae region flanked on opposite sides by two lower pressure edge portions. The edge portions facilitate the dispersion of and the collection of the feed fluid being treated and assist in obtaining a more uniform flow of the feed fluid through the high pressure region of the membrane. In one embodiment, the module has entrance and exit flow means for a counter-current flow of a sweep fluid through the permeate. Preferably, the high pressure permeate region is a high density porous spacer flanked on two sides with low density porous spacers. In one embodiment, the higher pressure permeate region and flanking low pressure drop permeate regions are obtained by specifically positioned lines of adhesive or glue spots (or lines) having a specific size and spacing. Generally the spots (or lines) are positioned in a generally axial configuration to the central pipe. Generally, the glue spots or lines are positioned in the permeate passageway in a pattern to obtain controlled flow of the countercurrent, cocurrent, or crosscurrent sweep fluid.
대표청구항
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A spiral wound membrane module having a semipermeable membrane for use in a housing in the separation of a fluid permeate from a fluid feed mixture, said module comprising a centrally located hollow pipe, at least one unsealed membrane envelope enclosing means to provide substantially uniform flow i
A spiral wound membrane module having a semipermeable membrane for use in a housing in the separation of a fluid permeate from a fluid feed mixture, said module comprising a centrally located hollow pipe, at least one unsealed membrane envelope enclosing means to provide substantially uniform flow in the feed passageway, at least one fluid feed spacer, and at least one permeate spacer means for providing substantially uniform flow of the permeate in the permeate passageway, wherein said permeate passageway includes, flow control means for enabling crosscurrent, countercurrent or cocurrent sweep fluid flow in the permeate passageway, said generally hollow pipe having a wall barrier intermediate in its length dividing the pipe into a first compartment and a second compartment, said pipe having means for collecting a fluid permeate stream from the first compartment of said pipe and means for collecting and removing the permeate fluid stream from the second compartment of the pipe, said first and second pipe compartments each having at least one radial opening through the pipe circumference through which permeate fluid will pass, said porous sheet permeate spacer means are in fluid communication with the radial fluid openings of the first and second pipe compartments, said at least one membrane envelope comprises a sheet membrane creating a feed passageway having a first surface and a second surface opposite to the first surface wherein the membrane is folded at least once or sealed so that first one-half of the first surface of the membrane layer faces the other one-half of the first surface of the membrane envelope and interposed between the first and second surfaces of the first membrane is said porous sheet fluid feed spacer means, said permeate passageway for the fluid permeate is formed by the adjacent membrane surfaces opposite to the first surface, wherein the adjacent surfaces opposite to the first surface are sealingly adhered to each other having spacer means in the permeate passageway between the adjacent membrane envelope surfaces opposite the first surface, means for removal of permeate fluid from the permeate fluid passageway to the exterior of the module, and means for restraining the unspiraling of the compact module roll under operational conditions. A membrane process for the removal of water, carbon dioxide, hydrogen sulfide or mixtures thereof, from a feed fluid comprising a feed fluid and water, carbon dioxide, hydrogen sulfide or mixtures thereof, which process comprises: A. contacting the feed fluid mixture comprising at least one fluid with a membrane separation module with the higher pressure side of a semi-permeable membrane having a higher pressure side and a lower pressure side, wherein said semi-permeable membrane is selectively permeable; and the separation module comprises: a spiral wound membrane having a semipermeable membrane for use in a housing in the separation of a fluid permeate from a fluid feed mixture, said module comprising a centrally located hollow pipe, at least one unsealed membrane envelope enclosing means to provide substantially uniform flow in the feed passageway, at least one fluid feed spacer, and at least one permeate spacer means for providing substantially uniform flow of the permeate in the permeate passageway, wherein said permeate passageway includes, flow control means for enabling crosscurrent, countercurrent or cocurrent sweep fluid flow in the permeate passageway, said generally hollow pipe having a wall barrier intermediate in its length dividing the pipe into a first compartment and a second compartment, said pipe having means for collecting a fluid permeate stream from the first compartment of said pipe and means for collecting and removing the permeate fluid stream from the second compartment of the pipe, said first and second pipe compartments each having at least one radial opening through the pipe circumference through which permeate fluid will pass, said porous sheet permeate spacer means are in fluid communication with the radial fluid openings of the first and second pipe compartments, said at least one membrane envelope comprises a sheet membrane creating a feed passageway having a first surface and a second surface opposite to the first surface wherein the membrane is folded at least once or sealed so that first one-half of the first surface of the membrane layer faces the other one-half of the first surface of the membrane envelope and interposed between the first and second surfaces of the first membrane is said porous sheet fluid feed spacer means, said permeate passageway for the fluid permeated is formed by the adjacent membrane surfaces opposite to the first surface, wherein the adjacent surfaces opposite to the first surface are sealingly adhered to each other having spacer means in the permeate passageway between the adjacent membrane envelope surfaces opposite the first surface, means for removal of permeate fluid from the permeate fluid passageway to the exterior of the module, and means for restraining the unspiraling of the compact module roll under operational conditions; B. maintaining a vapor partial pressure differential across said membrane under conditions such that at least one fluid selected from water, carbon dioxide, hydrogen sulfide or mixtures thereof selectively permeates through said membrane from said higher pressure side to said lower pressure side of the membrane; C. contacting said lower pressure side of said membrane with a sweep fluid, at a sufficient volumetric flowrate relative to said feed fluid mixture, whereby compounds in said feed fluid mixture selectively permeates through said semi-permeable membrane and into said sweep fluid; D. collecting said sweep fluid containing the at least one permeated fluid selected from water, carbon dioxide, hydrogen sulfide or mixtures thereof; and E. collecting the concentrated feed fluid depleted of water, carbon dioxide, hydrogen sulfide or mixtures thereof.
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