Patent US3872014A successfully refreshed from Google Patents.
US3872014A
Expired / Lapsed
US
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Membrane separation apparatus
Assignee: Aerojet Rocketdyne Inc
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Filing: 1974-03-11
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Granted: 1975-03-18
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Expires: 1994-03-11
Abstract
Abstract A module of a convolute design employing a permselective membrane suitable for use in separating a permeate from a fluid mixture of the general type employing two permselective membranes spaced from each other by a backing member to provide a first fluid passageway therebetween in which membrane permeate collects. The module employs a generally-hollow mandrel having a wall intermediate its length dividing the mandrel into a first compartment and a second compartment with means for introducing a fluid feed stream to the first compartment and means for removing an effluent fluid stream from the second mandrel compartment with means defining a second fluid passageway for presenting the fluid feed to the outside of the two permselective membranes upon the spiral wrapping of the two membranes about the mandrel. The second passageway is divided into two juxtapositioned regions, which two regions at a spaced distance from the mandrel are interconnected to direct flow of the fluid feed from the first region into the second region, with the first region being in fluid communication with the first compartment of the mandrel so as to receive the incoming fluid feed and said second region being in fluid communication with the second mandrel compartment through which the effluent feed stream is removed from the module. The first fluid passageway which has a spiral configuration in the assembled module may be open at one or both ends, through which openings the fluid permeate leaves the module in the case of ultrafiltration, reverse osmosis or gas separation. Where the module of the invention is being employed in dialysis, there will be separate extraneously-introduced fluid streams to the first and second passageways, respectively, of the structure and in such event it will be necessary to modify the module to have means for introducing a fluid stream to one end of the first fluid passageway, from which location the fluid flows through the passageway in a generally-parallel direction to and exteriorly of the mandrel to the other end of the module whence it is removed.
Inventors
- 👤 William J Schell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:36
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/10; B01D63/103; B01D63/1031; B01D53/00; B01D53/22; B01D2313/00; B01D2313/08; B01D2313/086; B01D2313/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
230 words
A module of a convolute design employing a permselective membrane for use in separating a permeate from a fluid feed mixture, said module comprising: a generally-hollow mandrel having a wall intermediate its length dividing the mandrel into a first compartment and a second compartment with means for introducing a fluid feed stream to the first compartment of said mandrel and means for removing an effluent fluid stream from the second compartment of the mandrel; two permselective membranes spaced from each other by a backing to provide a first fluid passageway therebetween; means defining a second fluid passageway for presenting the fluid feed to the two membranes upon the spiral wrapping of said two membranes about the mandrel to form a compact module roll, said second passageway beiing divided into two juxtapositioned regions which two regions at a spaced distance first compartment the mandrel are interconnected to direct flow of the fluid feed from the first region into the second region with said first region being in fluid communication with the firstcompartment of the mandrel to receive the incoming fluid feed and said second region being in fluid communication with the second compartment of the mandrel whence the effluent fluid stream is removed; means for removal of fluid from the first Fluid passageway to exterior of the module; and means restraining the unspiralling of the compact module roll under operational conditions.
Claim 2
Dependent Claim
230 words
A module of a convolute design employing a permselective membrane for use in separating a permeate from a fluid feed mixture, said module comprising: a generally-hollow mandrel having a wall intermediate its length dividing the mandrel into a first compartment and a second compartment with means for introducing a fluid feed stream to the first compartment of said mandrel and means for removing an effluent fluid stream from the second compartment of the mandrel; two permselective membranes spaced from each other by a backing to provide a first fluid passageway therebetween; means defining a second fluid passageway for presenting the fluid feed to the two membranes upon the spiral wrapping of said two membranes about the mandrel to form a compact module roll, said second passageway beiing divided into two juxtapositioned regions which two regions at a spaced distance first compartment the mandrel are interconnected to direct flow of the fluid feed from the first region into the second region with said first region being in fluid communication with the firstcompartment of the mandrel to receive the incoming fluid feed and said second region being in fluid communication with the second compartment of the mandrel whence the effluent fluid stream is removed; means for removal of fluid from the first Fluid passageway to exterior of the module; and means restraining the unspiralling of the compact module roll under operational conditions.
Claim 3
Dependent Claim
32 words
A module in accordance with claim 1 wherein the permselective membranes are cast on a permeable polymeric cloth and the polymeric cloth acts as a backing material in the first fluid passageway.
Claim 4
Dependent Claim
61 words
A module in accordance with claim 1 wherein a permeable tricot spacer cloth is positioned between the two permselective membranes, acting as a backing material to define the first fluid passageway, with the opening of said tricot spacer cloth being relatively loose so as to promote high longitudinal fluid flow in a general direction parallel to and exteriorly of the mandrel.
Claim 5
Dependent Claim
43 words
A module in accordance with claim 1 wherein the two permselective membranes are cast on a permeable polymeric cloth and a tricot spacer cloth is located therebetween with said permeable polymeric cloths together with the tricot spacer cloth defining the first fluid passageway.
Claim 6
Dependent Claim
29 words
A module in accordance with claim 1 wherein the means defining the second fluid passageway is an open grid sheet material through which the fluid feed may readily flow.
Claim 7
Dependent Claim
23 words
A module in accordance with claim 1 wherein the second fluid passageway comprises two thin, open channels which provide the two juxtapositioned regions.
Claim 8
Dependent Claim
24 words
A module in accordance with claim 1 wherein the two successive juxtapositioned fluid flow regions progressively diminish in width in direction of fluid flow.
Claim 9
Dependent Claim
55 words
A module in accordance with claim 1 wherein the means defining the second fluid passageway includes an open polymeric grid material having adhesive lines which adhesive lines serve to define the boundaries of the two juxtapositioned regions and to bond the structure layers together upon the spirally wrapping of the two membranes about the mandrel.
Claim 10
Dependent Claim
24 words
A module in accordance with claim 8 wherein the two successive juxtapositioned fluid flow regions progressively diminish in width in direction of fluid flow.
Claim 11
Dependent Claim
46 words
A module in accordance with claim 8 wherein each of the two juxtapositioned regions comprise thin, open channels that promote hydrodynamic shearing at the adjacent membrane surfaces with fluid flow therethrough, thereby minimizing concentration polarization and increasing permeate flow across the membranes into the first passageway.
Claim 12
Dependent Claim
21 words
A module in accordance with claim 10 wherein the channels have a depth in the range of 10 to 100 mils.
Claim 13
Dependent Claim
24 words
A module in accordance with claim 10 wherein the two successive juxtapositioned fluid flow regions progressively diminish in width in direction of fluid flow.
Claim 14
Dependent Claim
90 words
A module in accordance with claim 1 wherein there are at least two generally, laterally-extending co-extensive leaves which are separately in fluid communication with the two compartment mandrel with each leaf comprising as defined heretofore two permselective membranes with a first fluid passageway therebetween, and means defining a second fluid passageway for presenting the fluid feed to the outside of said two membranes of the respective leaves, said plurality of leaves being spirally wrapped around the mandrel in overlapping relationship one upon the other to form a compact module roll.
Claim 15
Dependent Claim
56 words
A module in accordance with claim 1 especially adapted for dialysis operation wherein there is a means for introducing a second fluid stream to the first fluid passageway at one end of the module and a means for removal of said second fluid stream from the first fluid passageway at the other end of the module.
Claim 16
Dependent Claim
57 words
A module in accordance with claim 1 especially adapted for separating a permeate gas from a gaseous feed stream introduced to the first compartment of said mandrel for flow through the second fluid passageway wherein the module is positioned in a closed vessel and means is provided for collecting and removing gas permeate from the first passageway.
Claim 17
Dependent Claim
49 words
A module in accordance with claim 1 wherein the means restraining the unspiralling of the compact mOdule roll under operational conditions comprises an outer tape wrapping about the circumference thereof, said tape wrapping being of the length of the module and covering the outer surface of said module roll.
Claim 18
Dependent Claim
37 words
A module in accordance with claim 16 wherein the structure described is snugly situated in a close fitting tubular member which member provides additional restraint to unspiralling, thus permitting use of the module at still higher pressures.
Claim 19
Dependent Claim
34 words
A module in accordance with claim 1 wherein the means restraining the unspiralling of the compact module roll comprises a tubular member which snugly engages the outer circumferential surface of the compact module roll.
Claim 20
Dependent Claim
46 words
A module in accordance with claim 18 wherein the tubular member is a metallic tube having an elongated slit running the length thereof with a clamping means spanning the slit which clamping means in its closed position firmly compresses the tube about the encircled module roll.
Claim 21
Dependent Claim
88 words
A module in accordance with claim 19 wherein the compact module roll prior to positioning in the metallic tube has a partially restrained diameter and the metallic tube has a first expanded position and a second unexpanded, clamped position, with the metallic tube in its expanded first position having an inside diameter larger than the partially restrained diameter of the compact module roll, thus facilitating in the assembling of the module, the positioning of the partially restrained compact module into the metallic tube in its expanded first position.
References Cited (Backward Citations)
US2883058A
Cited
US3827564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |