Patent US4246246A successfully refreshed from Google Patents.
Patent US4157376A successfully refreshed from Google Patents.
US4157376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purification of gases
Assignee: Individual
•
Filing: 1977-10-04
•
Granted: 1979-06-05
•
Expires: 1997-10-04
Abstract
Abstract A process for the removal of hydrogen fluoride and/or hydrogen chloride from gases comprising passing the gas to be purified through anion-exchange sorbent composed of a textured chemisorption fiber based on carbo-chain polymers with vinylpyridine groups or aliphatic amino groups. On exhaustion the sorbent is regenerated with water. The process of the present invention makes it possible to purify gases substantially completely irrespective of the initial concentrations of impurities in the gas being treated and ensures practically unlimited number of sorption-regeneration cycles with the same sorbent.
Inventors
- 👤 Alexandr I. Vulikh
- 👤 Maina K. Zagorskaya
- 👤 Natalia A. Fokina
- 👤 Gennady A. Nikandrov
- 👤 Lidia A. Reznichenko
- 👤 Mikhail P. Zverev
- 👤 Arkady N. Barash
- 👤 Valentina I. Surkova
- 👤 Alexei M. Mavrin
- 👤 Nikolai V. Troyan
- 👤 Nadezhda F. Kalyanova
- 👤 Ivan G. Shimko
- 👤 Alexandr A. Alovyainikov
- 👤 Lev I. Pechalin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:28
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A process for the removal of acidic gases selected from the group consisting of hydrogen fluoride and hydrogen chloride, comprising passing the gas being treated through an anion-exchange sorbent composed of a textured chemisorption fiber comprising polymers selected from the group consisting of carbo-chain polymers with aliphatic amino groups and carbo-chain polymers with vinylpyridine groups, followed by aqueous regeneration of the anion-exchange sorbent.
Claim 2
Dependent Claim
63 words
A process for the removal of acidic gases selected from the group consisting of hydrogen fluoride and hydrogen chloride, comprising passing the gas being treated through an anion-exchange sorbent composed of a textured chemisorption fiber comprising polymers selected from the group consisting of carbo-chain polymers with aliphatic amino groups and carbo-chain polymers with vinylpyridine groups, followed by aqueous regeneration of the anion-exchange sorbent.
Claim 3
Dependent Claim
50 words
A process as claimed in claim 1, wherein the textured chemisorption fiber comprising carbo-chain polymers with vinylpyridine groups comprises a copolymer consisting of 50 to 80% by weight of acrylonitrile and 50 to 20% by weight of a vinylpyridine monomer selected from the group consisting of 2-vinylpyridine, 4-vinylpyridine and 2-methyl-5-vinylpyridine.
Claim 4
Dependent Claim
64 words
A process as claimed in claim 1, wherein the textured chemisorption fiber comprising carbo-chain polymers with vinylpyridine groups comprises 20 to 50% by weight of a halide-containing polymer of the vinyl series selected from the group consisting of polyvinylidene chloride, polyvinylidene fluoride and polyvinyl chloride, and 80 to 50% by weight of a polyvinylpyridine selected from the group consisting of poly-2-vinylpyridine, poly-4-vinylpyridine and poly-2-methyl-5-vinylpyridine.
Claim 5
Dependent Claim
50 words
A process as claimed in claim 1, wherein the textured chemisorption fiber comprising carbo-chain polymers with vinylpyridine groups comprises a copolymer consisting of 20 to 50% by weight of polypropylene and 80 to 50% by weight of a vinylpyridine monomer selected from the group consisting of 2-vinylpyridine, 4-vinylpyridine and 2-methyl-5-vinylpyridine.
Claim 6
Dependent Claim
71 words
A process as claimed in claim 1, wherein the textured chemisorption fiber comprising carbo-chain polymers with aliphatic amino groups comprises 20 to 60% by weight of a polyamine selected from the group consisting of polyethylene polyamine and polyethylene imine, and 80 to 40% by weight of a halide-containing polymer of the vinyl series selected from the group consisting of polyvinylidene chloride, polyvinylidene fluoride and a copolymer of vinylidene fluoride with tetrafluoroethylene.
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) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |