US2701750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of diethanolamine and salts
Assignee: Standard Oil Development Co
•
Filing: 1952-05-20
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Granted: 1955-02-08
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Expires: 1972-05-20
Abstract
No abstract record available.
Inventors
- 👤 Henry C Paulsen
- 👤 John B Holtzclaw
- 👤 Thomas P Mcnamara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:07
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
AN IMPROVED PROCESS FOR THE REMOVAL OF HYDROGEN SULFIDE FROM GASES CONTAINING HYDROGEN SULFIDE AND ORGANIC ACIDS WHICH COMPRISES CONTACTING SAID GASES WITH AN ETHANOLAMINE SOLUTION WHEREBY SAID HYDROGEN SULFIDE AND SAID ORGANIC ACIDS COMBINE WITH THE ETHANOLAMINE, STEAM STRIPPING THE RESULTING ETHANOLAMINE SOLUTION WHEREBY HYDROGEN SULFIDE IS RECOVERED FROM THE SOLUTION, SEGREGATING AT LEAST A PORTION OF THE STRIPPED SOLUTION, CONTACTING THE SEGREGATED PORTION WITH A CAUSTIC SOLUTION SELECTED FROM THE CLASS CONSISTING OF POTASSIUM HYDROXIDE AND SODIUM HYDROXIDE IN ABOUT 5 TO 30 WEIGHT PERCENT CONCENTRATION IN AN AMOUNT TO CONVERT TO THE CORRESPONDING METAL SALTS SUBSTANTIALY ALL OF SAID ORGANIC ACIDS AND TO REGENERATE SUBSTANTIALLY ALL OF THE ETHANOLAMINE IN SAID PORTION, REMOVING 80 TO 95% OF THE WATER FROM SAID PORTION, CONTACTING THE DEHYDRATED PORTION WITH ABOUT 0.5 TO 3 VOLUMES OF ALCOHOL PER VOLUME OF SAID DEHYDRATED PORTION TO SELECTIVELY DISSOLVE THE ETHANOLAMINE AND TO FORM
Claim 2
Dependent Claim
151 words
AN IMPROVED PROCESS FOR THE REMOVAL OF HYDROGEN SULFIDE FROM GASES CONTAINING HYDROGEN SULFIDE AND ORGANIC ACIDS WHICH COMPRISES CONTACTING SAID GASES WITH AN ETHANOLAMINE SOLUTION WHEREBY SAID HYDROGEN SULFIDE AND SAID ORGANIC ACIDS COMBINE WITH THE ETHANOLAMINE, STEAM STRIPPING THE RESULTING ETHANOLAMINE SOLUTION WHEREBY HYDROGEN SULFIDE IS RECOVERED FROM THE SOLUTION, SEGREGATING AT LEAST A PORTION OF THE STRIPPED SOLUTION, CONTACTING THE SEGREGATED PORTION WITH A CAUSTIC SOLUTION SELECTED FROM THE CLASS CONSISTING OF POTASSIUM HYDROXIDE AND SODIUM HYDROXIDE IN ABOUT 5 TO 30 WEIGHT PERCENT CONCENTRATION IN AN AMOUNT TO CONVERT TO THE CORRESPONDING METAL SALTS SUBSTANTIALY ALL OF SAID ORGANIC ACIDS AND TO REGENERATE SUBSTANTIALLY ALL OF THE ETHANOLAMINE IN SAID PORTION, REMOVING 80 TO 95% OF THE WATER FROM SAID PORTION, CONTACTING THE DEHYDRATED PORTION WITH ABOUT 0.5 TO 3 VOLUMES OF ALCOHOL PER VOLUME OF SAID DEHYDRATED PORTION TO SELECTIVELY DISSOLVE THE ETHANOLAMINE AND TO FORM
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) | 1958-02-07 | 1958-08-09 | 1959-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-07 | 1962-08-09 | 1963-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-07 | 1966-08-09 | 1967-02-08 | $7700.00 | Window Closed / Lapsed |