US3947351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid diffusion-dialysis process utilizing anion exchange membrane of 4-55 micron thickness
Assignee: AGC Inc
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Filing: 1973-05-24
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Granted: 1976-03-30
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Expires: 1993-05-24
Abstract
Abstract An acid diffusion-dialysis membrane, which can be used for separating an acid from a mixture of an acid and a salt, or a mixture of an acid and a water-soluble organic compound, e.g., glucose, by non-electrolytic dialysis, is prepared by forming a film from the combination of (I) a vinyl group containing benzene monomer or a vinyl group containing pyridine monomer, (II) a non-conjugated divinyl-containing monomer, and (III) a thermoplastic polymer which is swellable or soluble in the monomer mixture, polymerizing said monomer mixture in the film, and then introducing anion exchange groups into the resulting polymerized product. The acid diffusion-dialysis membrane is characterized by a high acid diffusion-dialysis coefficient and a high acid-salt selectivity ratio, and further by a relatively high mechanical strength.
Inventors
- 👤 Tatsuro Asawa
- 👤 Tomoki Gunjima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:36
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0006; B01D61/00; B01D61/24; B01D61/243; B01D67/0081; B01D67/0093; B01D67/00933; C; C08; C08F; C08F255/00; C08F255/02; C08F259/00; C08F259/02; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; B01D2323/00; B01D2323/30; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
In a process for effecting diffusion-dialysis of acids, the improvement which comprises: using a membrane 4 - 55μ thick prepared by polymerizing a monomer mixture of 100 parts by weight of γ-chloromethylstyrene and 3 - 20 parts by weight of divinylbenzene in contact with 150 - 400 parts by weight of a thermoplastic polymer, having a molecular weight of greater than 10,000 and being selected from the group consisting of polyvinylchloride, polyvinylidene chloride, polyethylene and polypropylene, and then is reacted with trimethylamine for amination.
Claim 2
Dependent Claim
84 words
In a process for effecting diffusion-dialysis of acids, the improvement which comprises: using a membrane 4 - 55μ thick prepared by polymerizing a monomer mixture of 100 parts by weight of γ-chloromethylstyrene and 3 - 20 parts by weight of divinylbenzene in contact with 150 - 400 parts by weight of a thermoplastic polymer, having a molecular weight of greater than 10,000 and being selected from the group consisting of polyvinylchloride, polyvinylidene chloride, polyethylene and polypropylene, and then is reacted with trimethylamine for amination.
Claim 3
Dependent Claim
44 words
The process of claim 1, wherein said thermoplastic polymer is dipped into said monomer mixture which in addition to said divinylbenzene and γ-chloromethylstyrene contains 50 - 300 parts by weight of a diluent selected from the group consisting of isooctane, petroleum ether and gasoline.
Claim 4
Dependent Claim
36 words
The process according to claim 1, wherein the thermoplastic polymer is in the form of a film and contact between said film and said monomer mixture is effected by impregnating the monomer mixture into said film.
Claim 5
Dependent Claim
35 words
The process according to claim 1, wherein the thermoplastic polymer is in the form of a powder or granule and is admixed with said monomer mixture and is formed into a film prior to polymerization.
Claim 6
Dependent Claim
24 words
The process according to claim 1, wherein said monomer mixture further contains a polymerization initiator and thermal polymerization is effected by thermal polymerization techniques.
Claim 7
Dependent Claim
21 words
The process according to claim 1, wherein said monomer mixture further contains a photosensitizer and polymerization is effected by photo-polymerization techniques.
Claim 8
Dependent Claim
17 words
The process according to claim 1, wherein said monomer mixture is polymerized by ionizing radiation polymerization techniques.
References Cited (Backward Citations)
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US3298969A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |