US3890431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
SO{HD 2 {L removal from gases
Assignee: Ethyl Corp
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Filing: 1973-10-04
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Granted: 1975-06-17
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Expires: 1993-10-04
Abstract
Abstract A process for recovering SO2 is disclosed. It involves reacting SO2 or a system containing SO2 with carboxymethoxy-succinic acid or a water soluble salt thereof to form an aqueous solution complex containing SO2 and carboxymethoxysuccinic acid or a water soluble salt thereof. The complex thus obtained may be treated to remove the sulfur and regenerate the carboxymethoxysuccinic acid or water soluble salt thereof providing a cyclic process.
Inventors
- 👤 Sidney M Blitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:04
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
36 words
A process for collecting SO2 which comprises contacting gaseous SO2 with an aqueous solution of carboxymethoxysuccinic acid or a water soluble salt thereof to produce a complex containing SO2 and carboxymethoxysuccinic acid or the salt thereof.
Claim 2
Dependent Claim
36 words
A process for collecting SO2 which comprises contacting gaseous SO2 with an aqueous solution of carboxymethoxysuccinic acid or a water soluble salt thereof to produce a complex containing SO2 and carboxymethoxysuccinic acid or the salt thereof.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the pH is from about 2.5 to about 8.0.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the temperature is from about 0*C to about 100*C.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the pH is from about 2.5 to about 8.0 and the temperature is from about 0*C to about 100*C.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the carboxymethoxysuccinic acid or salt thereof is subsequently recovered from the complex.
Claim 7
Dependent Claim
28 words
The process of claim 1 wherein the complex is treated with H2S whereby carboxymethoxysuccinic acid or the salt thereof is regenerated and sulfur is liberated as a by-product.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the gaseous SO2 is a minor percentage component in a gas stream.
Claim 9
Dependent Claim
50 words
A PROCESS FOR REMOVING SO2 FROM A GASEOUS STREAM CONTAINING SO2 WHICH COMPRISES BRINGING SAID STREAM INTO CONTACT WITH AN AQUEOUS SOLUTION OF CARBOXYMETHOXYSUCCINIC ACID OR A WATER SOLUBLE SALT THEREOF WHEREBY SO2 IS REMOVED FROM SAID STREAM FORMING A COMPLEX CONTAINING SO2 AND CARBOXYMETHOXYSUCCINIC ACID OR THE SALT THEREOF.
Claim 10
Dependent Claim
50 words
A PROCESS FOR REMOVING SO2 FROM A GASEOUS STREAM CONTAINING SO2 WHICH COMPRISES BRINGING SAID STREAM INTO CONTACT WITH AN AQUEOUS SOLUTION OF CARBOXYMETHOXYSUCCINIC ACID OR A WATER SOLUBLE SALT THEREOF WHEREBY SO2 IS REMOVED FROM SAID STREAM FORMING A COMPLEX CONTAINING SO2 AND CARBOXYMETHOXYSUCCINIC ACID OR THE SALT THEREOF.
Claim 11
Dependent Claim
46 words
The process of claim 8 which includes treating the complex with H2S to regenerate the carboxymethoxysuccinic acid or the salt thereof and liberate sulfur, removing the sulfur and returning the carboxymethoxysuccinic acid or the salt thereof to the bringing into contact step providing a cyclic operation.
Claim 12
Dependent Claim
60 words
A process for removing SO2 or H2SO3 from an aqueous system, which comprises, contacting said system with carboxymethoxysuccinic acid or a water soluble salt thereof to produce an aqueous complex containing SO2 and carboxymethoxysuccinic acid or the salt thereof, treating said complex with H2S to regenerate the carboxymethoxysuccinic acid or the salt thereof and liberate sulfur, and recovering sulfur liberated.
Claim 13
Dependent Claim
60 words
A process for removing SO2 or H2SO3 from an aqueous system, which comprises, contacting said system with carboxymethoxysuccinic acid or a water soluble salt thereof to produce an aqueous complex containing SO2 and carboxymethoxysuccinic acid or the salt thereof, treating said complex with H2S to regenerate the carboxymethoxysuccinic acid or the salt thereof and liberate sulfur, and recovering sulfur liberated.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |