Patent US3653809A successfully refreshed from Google Patents.
US3653809A
Expired / Lapsed
US
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Process for the removal of acidic constituents from gaseous mixtures
Assignee: Leuna Werke GmbH
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Filing: 1970-03-09
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Granted: 1972-04-04
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Expires: 1990-03-09
Abstract
Abstract Acidic constituents are removed from gaseous mixtures by washing with a solvent which comprises a N-substituted Epsilon caprolactam. The solvent may also contain water and/or an alkanolamine. These solvents are advantageous, because, even in the presence of water, they cause no corrosion.
Inventors
- 👤 Klaus Wehner
- 👤 Horst Grunert
- 👤 Werner Kisan
- 👤 Gerhard Esser
- 👤 Horst Knopel
- 👤 Dietmar Flad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:07
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/62
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
The process according to claim 1 wherein said solvent contains in addition to said N- substituted epsilon -caprolactam at least one member selected from the group consisting of water, diethanolamine and diisopropanolamine.
Claim 2
Dependent Claim
32 words
The process according to claim 2 wherein the solvent consists of a mixture of 60 percent of N- methyl - epsilon - caprolactam, 20 percent of diisopropanolamine and 20 percent of water.
Claim 3
Dependent Claim
44 words
The process according to claim 3 wherein the gaseous mixture contains carbon dioxide, carbon monoxide, nitrogen, methane and hydrogen, and carbon dioxide is present in the amount of 8 percent, and after washing, the purified gas contains less than 0.5 percent of carbon dioxide.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |