US6348083B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and installation for the recovery and/or purification of the nitrous oxide contained in a waste gas
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 2000-02-17
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Granted: 2002-02-19
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Expires: 2020-02-17
Abstract
Abstract An installation and a process for the recovery and/or purification of at least one portion of the nitrous oxide (N 2 O) contained in a flow of waste gas containing nitrous oxide and at least one other gaseous compound, in which: (a) at least one nitrous oxide portion contained in the flow of waste gas is separated by permeation, and (b) at least a portion of the gaseous nitrous oxide separated in step (a) is recovered. Preferably, the source of the flow of waste gas is an industrial unit using an industrial process giving off the waste gas, preferably a unit for the production of adipic acid, a unit for the production of nitrous oxide, a unit for the production of glycoxylic acid or a unit for the production of nitric acid.
Inventors
- 👤 Gilbert Chevalier
- 👤 Philippe Urner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:59
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56; B01D53/22; Y; Y02; Y02C; Y02C20/00; Y02C20/10; Y02P; Y02P20/00; Y02P20/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
171 words
Process for the recovery and/or purification of at least one portion of nitrous oxide (N 2 O) contained in a flow of waste gas comprising nitrous oxide and at least one other gaseous component, comprising the steps of: (a) separating by permeation at least one portion of the nitrous oxide contained in the flow of waste gas, the flow of waste gas containing from 20 to 99.9% by volume of nitrous oxide, the flow of waste gas being a waste gas from an industrial process selected from the group consisting of a waste gas emanating from a process for the production of adipic acid, a waste gas emanating from a process for the production of nitrous oxide, a waste gas emanating from a process for the production of nitric acid, a waste gas emanating from a process for the production of glycoxylic acid and a waste gas emanating from a process for the production of phenol; and (b) recovering at least one portion of the nitrous oxide separated in step (a).
Claim 2
Dependent Claim
171 words
Process for the recovery and/or purification of at least one portion of nitrous oxide (N 2 O) contained in a flow of waste gas comprising nitrous oxide and at least one other gaseous component, comprising the steps of: (a) separating by permeation at least one portion of the nitrous oxide contained in the flow of waste gas, the flow of waste gas containing from 20 to 99.9% by volume of nitrous oxide, the flow of waste gas being a waste gas from an industrial process selected from the group consisting of a waste gas emanating from a process for the production of adipic acid, a waste gas emanating from a process for the production of nitrous oxide, a waste gas emanating from a process for the production of nitric acid, a waste gas emanating from a process for the production of glycoxylic acid and a waste gas emanating from a process for the production of phenol; and (b) recovering at least one portion of the nitrous oxide separated in step (a).
Claim 3
Dependent Claim
22 words
Process according to claim 1 , wherein the flow of waste gas contains from 50 to 99.9% by volume of nitrous oxide.
Claim 4
Dependent Claim
26 words
Process according to claim 1 , wherein the at least one other gaseous component is selected from the group consisting of nitrogen, oxygen and carbon monoxide.
Claim 5
Dependent Claim
22 words
Process according to claim 1 , wherein step (a) comprises passing the flow of waste gas through at least one permeation module.
Claim 6
Dependent Claim
21 words
Process according to claim 1 , wherein in step (b), a gas containing 80 to 100% of nitrous oxide is recovered.
Claim 7
Dependent Claim
20 words
Process according to claim 1 , wherein the waste gas is at a temperature between −30° C. and +80° C.
Claim 8
Dependent Claim
22 words
Process according to claim 1 , wherein the waste gas is at a pressure of 10 5 Pa to 10 7 Pa.
Claim 9
Dependent Claim
16 words
Process according to claim 4 , wherein the at least one permeation module comprises membrane fibers.
Claim 10
Dependent Claim
21 words
Process according to claim 5 , wherein in step (b), a gas containing at least 90% of nitrous oxide is recovered.
Claim 11
Dependent Claim
20 words
Process according to claim 6 , wherein the waste gas is at a temperature between −20° C. and +60° C.
Claim 12
Dependent Claim
22 words
Process according to claim 7 , wherein the waste gas is at a pressure of 10 6 Pa to 6.10 6 Pa.
Claim 13
Dependent Claim
170 words
Industrial installation for the recovery and/or purification of at least one portion of nitrous oxide (N 2 O) contained in a flow of waste gas comprising nitrous oxide and at least one other gaseous compound, comprising: at least one source of a flow of waste gas containing nitrous oxide and at least one other gaseous compound, the source of the flow of waste gas comprising an industrial unit using an industrial process discharging the waste gas, the industrial unit using an industrial process discharging the waste gas being selected from the group consisting of a unit for the production of adipic acid, a unit for the production of nitrous oxide, a unit for the production of phenol, a unit for the production of glycoxylic acid and a unit for the production of nitric acid, permeation means permitting separating by permeation at least one nitrous oxide portion contained in the flow of waste gas, and means for recovering at least one portion of the nitrous oxide separated by the permeation means.
Claim 14
Dependent Claim
170 words
Industrial installation for the recovery and/or purification of at least one portion of nitrous oxide (N 2 O) contained in a flow of waste gas comprising nitrous oxide and at least one other gaseous compound, comprising: at least one source of a flow of waste gas containing nitrous oxide and at least one other gaseous compound, the source of the flow of waste gas comprising an industrial unit using an industrial process discharging the waste gas, the industrial unit using an industrial process discharging the waste gas being selected from the group consisting of a unit for the production of adipic acid, a unit for the production of nitrous oxide, a unit for the production of phenol, a unit for the production of glycoxylic acid and a unit for the production of nitric acid, permeation means permitting separating by permeation at least one nitrous oxide portion contained in the flow of waste gas, and means for recovering at least one portion of the nitrous oxide separated by the permeation means.
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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) | 2005-02-18 | 2005-08-20 | 2006-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-02-18 | 2009-08-20 | 2010-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-02-18 | 2013-08-20 | 2014-02-19 | $7700.00 | Window Closed / Lapsed |