Patent US5085592A successfully refreshed from Google Patents.
Patent US4507271A successfully refreshed from Google Patents.
US4507271A
Expired / Lapsed
US
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Removal of nitrous oxide from gases containing hydrogen, nitric oxide and nitrous oxide
Assignee: BASF SE
•
Filing: 1983-11-28
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Granted: 1985-03-26
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Expires: 2003-11-28
Abstract
Abstract Nitrous oxide is removed from gases containing hydrogen, nitric oxide and nitrous oxide by a process in which the gases are treated with molecular sieves.
Inventors
- 👤 Frans van Deyck
- 👤 Franz-Josef Weiss
- 👤 Roger Verberckt
- 👤 Erwin Thomas
- 👤 Benedikt Mangelschots
- 👤 Paul Pijl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:11
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/14; C01B21/1409; C01B21/1418; B; B01; B01D; B01D53/00; B01D53/02; Y; Y02; Y02C; Y02C20/00; Y02C20/10; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A process for preparing hydroxylammonium salts comprising the steps of treating a gas containing hydrogen, nitric oxide and nitrous oxide with molecular sieves to remove nitrous oxide therefrom, and then catalytically reducing the nitric oxide with hydrogen in the treated gas in the presence of a strong mineral acid to form hydroxylammonium salts.
Claim 2
Dependent Claim
53 words
A process for preparing hydroxylammonium salts comprising the steps of treating a gas containing hydrogen, nitric oxide and nitrous oxide with molecular sieves to remove nitrous oxide therefrom, and then catalytically reducing the nitric oxide with hydrogen in the treated gas in the presence of a strong mineral acid to form hydroxylammonium salts.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1, wherein the molecular sieve used is an A, X or Y zeolite.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1, wherein, before the treatment, water is removed from the gas containing nitrous oxide.
Claim 5
Dependent Claim
22 words
A process as claimed in claim 1, wherein the treatment with molecular sieves is carried out at from -35° to 50° C.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 1, wherein the treatment with molecular sieves is carried out under an absolute pressure of from 1 to 51 bar.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 1, wherein the molecular sieves are regenerated under reduced pressure and/or by treatment with an inert or oxidizing gas.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 6, wherein the regeneration is carried out at from 0° to 300° C.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 1, wherein the treatment is effected in not less than 2 zones, adsorption and regeneration being carried out alternately.
Claim 10
Dependent Claim
39 words
A process as claimed in claim 1, wherein the gas treated is one which is obtained in the preparation of hydroxylammonium salts by catalytic reduction of nitric oxide with hydrogen in the presence of a strong aqueous mineral acid.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |