Patent US3857782A successfully refreshed from Google Patents.
US3857782A
Expired / Lapsed
US
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Semipermeable membrane process and device employing an aminoethylated polymeric material as the semipermeable membrane
Assignee: Kovalus Separation Solutions LLC
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Filing: 1971-11-04
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Granted: 1974-12-31
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Expires: 1991-11-04
Abstract
Abstract An improved permeation process particularly useful for separating low molecular weight solids, such as urea and salts as in osmotic and dialytic separation processes, employs a semipermeable membrane material characterized by having polyaminoethylene grafts. Aminoethylated polymeric materials, such as cellulose and polyamides or polyethylene imine are employed in capillary fiber form in permeation processes and devices which materials exhibit improved permeation rates, particularly for low molecular weight solids in aqueous solutions.
Inventors
- 👤 R Crowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:30
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0093; B01D67/00931; B01D71/00; B01D71/06; B01D71/56; B01D71/76; B01D71/82; B01D2323/00; B01D2323/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
IN A SEPARATORY PROCESS WHICH COMPRISES: EXPOSING UNDER FLUID PRESSURE ONE SIDE OF A SELECTED POLYMERIC PPERMEABLE MEMBRANE TO A FLUID HAVING AT LEAST ONE COMPONENT PERMEABLE TO SAID MEMBRANE, AND SEPARATING THAT PORTION OF THE FLUID WHICH PERMEATER THE MEMBRANE FROM THAT PORTION OF THE FLUID WHICH DOES NOT PERMEATE THE MEMBRANE, THE IMPROVEMENT WHICH COMPRISES: EMPLOYING AS THE SELECTED PERMEABLE POLYMERIC MEMBRANE MATERIAL A POLYMER SELCTED FROM THE GROUP CONSISTING OF POLYETHYLENE IMINE AND A POLYAMIDE CONTAINING REACTIVE NH GROUPS AND MODIFIED BY THE REACTION OF THE NH GROUPS OF THE POLYAMIDE WITH AN ETHYLENE IMINE TO CONTAIN FROM ABOUT 5 TO 60 PERCENT BY WEIGHT ETHYLENE IMINE, GENERALLY IN THE FORM OF POLYETHYLENE IMINE GRAFTS THEREON.
Claim 2
Dependent Claim
119 words
IN A SEPARATORY PROCESS WHICH COMPRISES: EXPOSING UNDER FLUID PRESSURE ONE SIDE OF A SELECTED POLYMERIC PPERMEABLE MEMBRANE TO A FLUID HAVING AT LEAST ONE COMPONENT PERMEABLE TO SAID MEMBRANE, AND SEPARATING THAT PORTION OF THE FLUID WHICH PERMEATER THE MEMBRANE FROM THAT PORTION OF THE FLUID WHICH DOES NOT PERMEATE THE MEMBRANE, THE IMPROVEMENT WHICH COMPRISES: EMPLOYING AS THE SELECTED PERMEABLE POLYMERIC MEMBRANE MATERIAL A POLYMER SELCTED FROM THE GROUP CONSISTING OF POLYETHYLENE IMINE AND A POLYAMIDE CONTAINING REACTIVE NH GROUPS AND MODIFIED BY THE REACTION OF THE NH GROUPS OF THE POLYAMIDE WITH AN ETHYLENE IMINE TO CONTAIN FROM ABOUT 5 TO 60 PERCENT BY WEIGHT ETHYLENE IMINE, GENERALLY IN THE FORM OF POLYETHYLENE IMINE GRAFTS THEREON.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said membrane is a hollow capillary fiber.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein the membrane has a high permeability to low molecular weight components and contains from about 40 to 65 percent by weight of combined ethylene imine.
Claim 5
Dependent Claim
27 words
A reverse osmosis process according to the process of claim 1 wherein the membrane contains from about 10 to 40 percent by weight of combined ethylene imine.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said membrane is in a tubular form, the membrane material cast onto the internal portion of a tubular support.
Claim 7
Dependent Claim
40 words
The process of claim 1 wherein the membrane is exposed to a fluid which comprises a water solution containing urea, salts and proteinaceous matter and which membrane has a selectivity which permits the passage of the water, salt and urea.
Claim 8
Dependent Claim
30 words
The process of claim 1 wherein the membrane is a hollow capillary fiber and in which the exterior portion of the fiber material has been reacted with the ethylene imine.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the ethylene imine is an alkyl ethylene imine.
Claim 10
Dependent Claim
10 words
The capillary fibers prepared by the process of claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |