Patent US3620674A successfully refreshed from Google Patents.
US3620674A
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Process for regenerating volatile bases and volatile acids from the salts formed therewith
Assignee: IFP Energies nouvelles
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Filing: 1968-02-07
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Granted: 1971-11-16
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Expires: 1988-02-07
Abstract
Abstract A two-stage process for regenerating volative bases B'' and weak volatile acids A'' from their salts which comprises contacting, in a first stage, the salt with an organic base B of low volatility to liberate the volatile base B'' in a gaseous form and liberating the weak volatile acid A'' in gaseous form in a second stage while generating the base B of low volatility in the liquid phase.
Inventors
- 👤 Philippe Renault
- 👤 Serge Falcon
- 👤 Jean-Claude Chavin
- 👤 Andre Deschamps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:52
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/026; C01C1/028; C01B; C01B17/00; C01B17/16; C01B17/167; C01B17/48; C01B17/50; C01B17/60; C01B32/00; C01B32/50; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
19 words
A process according to claim 1 wherein the base B contains from 5 to 40 carbon atoms per molecule.
Claim 2
Dependent Claim
48 words
A process according to claim 1, wherein said process is carried out with the use of a solvent selected from the group consisting of water, lactames amides, sulfoxides, sulfones, alcohols, polyols, polyalkleneglycols, mono- and polyethers of polyols and of polyalkyleneglycols and ethers-esters of polyols and of polyalkylene glycols.
Claim 3
Dependent Claim
25 words
A process according to claim 3, wherein the organic base B of low volatility constitutes from 1 to 50 percent by weight of the solution.
Claim 4
Dependent Claim
24 words
A process according to claim 4 wherein the organic base B of low volatility represents 10 to 20 percent by weight of the solution.
Claim 5
Dependent Claim
42 words
A process according to claim 1, wherein the salt is ammonium sulfite obtained by the reaction of ammonia with a gaseous mixture containing sulfurous anhydride at a temperature of 20*-60* C. and wherein the recovered ammonia is recycled to the salt-manufacturing zone.
Claim 6
Dependent Claim
23 words
A process according to claim 6 wherein the organic base of low volatility is triethanolamine and the solvent is triethylene glycol monoethyl ether.
Claim 7
Dependent Claim
40 words
A process according to claim 6, wherein a portion of the starting gaseous mixture, containing sulfurous anhydride, is swept through the first stage during said stage of the process so as to facilitate the liberation of the volatile base B''.
Claim 8
Dependent Claim
30 words
A process according to claim 1, wherein to facilitate the liberation of the volatile base B'' , nitrogen is swept through the first stage during said stage of the process.
Claim 9
Dependent Claim
27 words
A process according to claim 1, wherein, during the second stage stream is swept through said second stage to facilitate the liberation of the weak volatile acid.
Claim 10
Dependent Claim
28 words
A process according to claim 1, wherein 1 to 100 moles of base B are used per mole of base B'' in a combined form in the salt.
Claim 11
Dependent Claim
24 words
A process according to claim 1, wherein the salt A'' B'' is an ammonium sulfide, cyanide, formiate, acetate, carbonate, bicarbonate, sulfite, bisulfite or fluoride.
Claim 12
Dependent Claim
20 words
The process of claim 1, wherein the second stage is conducted at a temperature of about 110* to 170* C.
Claim 13
Dependent Claim
32 words
The process of claim 6, wherein the salt of A'' B'' is ammonium sulphite and the base B of low volatility is triethanolamine which has been added to the solvent tetramethylene sulfone.
Claim 14
Dependent Claim
10 words
The process of claim 14, wherein the solvent is N-methyl-pyrrolidone.
Claim 15
Dependent Claim
11 words
The process of claim 14, wherein the solvent is propyleneglycol carbonate.
Claim 16
Dependent Claim
32 words
The process of claim 6, wherein the salt of A'' B'' is ammonium acetate and the base B of low volatility is triethanolamine which has been added to the solvent tetramethylene sulfone.
Claim 17
Dependent Claim
31 words
The process of claim 6, wherein the salt of A'' B'' is F2HNH4 and the base B of low volatility is triethanolamine which has been added to the solvent diethYlene glycol.
Claim 18
Dependent Claim
22 words
The process of claim 1, wherein said salts are the reaction of products of volatile bases B'' and weak volatile acids A''.
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |