US4738694A
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US
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Process and plant for purification by adsorption on activated carbon and corresponding adsorber vessel
Assignee: L' AIR LIQUIDE POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE 75 QUAI D'ORSAY - 75007 PARIS (FRANCE) SA
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Filing: 1986-04-22
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Granted: 1988-04-19
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Expires: 2006-04-22
Abstract
Abstract A gas is purified by adsorption on activated carbon contained in an adsorber vessel. The carbon is desorbed by passing an inert gas therethrough at a sufficiently high temperature. The desorbed impurity is removed by refrigeration and the refrigeration is supplied by the vaporization of an inert gas in liquid phase. This vaporized inert gas, in turn, comprises the desorption gas.
Inventors
- 👤 Claude Godino
- 👤 Philippe Duval
- 👤 Benoit Ghnassia-Daudin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:44
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0446; B01D53/0438; B01D2253/00; B01D2253/10; B01D2253/102; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40088; B01D2259/4009
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
103 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap maintained at a temperature of condensation of said impurity, the desorption comprising a preheating stage in which a charge of inert gas is circulated in a closed loop through the activated carbon until its content of impurity reaches a predetermined threshold, and an elution stage in which a stream of inert gas is circulated through the activated carbon and sent to the refrigerating trap.
Claim 2
Dependent Claim
103 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap maintained at a temperature of condensation of said impurity, the desorption comprising a preheating stage in which a charge of inert gas is circulated in a closed loop through the activated carbon until its content of impurity reaches a predetermined threshold, and an elution stage in which a stream of inert gas is circulated through the activated carbon and sent to the refrigerating trap.
Claim 3
Dependent Claim
97 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, comprising passing said gas through activated carbon to absorb said impurity on said activated carbon, and thereafter desorbing the impurity from the activated carbon by passing a current of inert gas through the activated carbon and then to a refrigerating trap at a temperature of condensation of said impurity, cooling said refrigerating trap by vaporizing an inert gas stored in liquid phase, and passing at least a part of the inert gas thus vaporized through said activated carbon to desorb the activated carbon.
Claim 4
Dependent Claim
97 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, comprising passing said gas through activated carbon to absorb said impurity on said activated carbon, and thereafter desorbing the impurity from the activated carbon by passing a current of inert gas through the activated carbon and then to a refrigerating trap at a temperature of condensation of said impurity, cooling said refrigerating trap by vaporizing an inert gas stored in liquid phase, and passing at least a part of the inert gas thus vaporized through said activated carbon to desorb the activated carbon.
Claim 5
Dependent Claim
22 words
A process according to claim 2, characterised in that the activated carbon and/or the inert gas is heated during the desorption operation.
Claim 6
Dependent Claim
26 words
A process according to claim 3, characterised in that the activated carbon is cooled after the end of the desorption operation and/or during the adsorption stage.
Claim 7
Dependent Claim
33 words
A process according to claim 2, characterised in that at least a part of the vaporized inert gas is used for rendering inert a machine from which comes the gas to be treated.
Claim 8
Dependent Claim
26 words
A process according to claim 2, for the purification of a humid gas, characterised in that said gas is previously passed through a molecular sieve bed.
Claim 9
Dependent Claim
138 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap (2) maintained at a temperature of condensation of said impurity and cooled by vaporization of said inert gas stored in the liquid form, at least a part of the inert gas thus vaporized being used for effecting the desorption of the activated carbon, the desorption comprising a preheating stage in which a charge of inert gas is circulated in a closed loop through the activated carbon until its content of impurity reaches a predetermined threshold, and an elution stage in which a stream of inert gas is circulated through the activated carbon and sent to said refrigerating trap (2).
Claim 10
Dependent Claim
138 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap (2) maintained at a temperature of condensation of said impurity and cooled by vaporization of said inert gas stored in the liquid form, at least a part of the inert gas thus vaporized being used for effecting the desorption of the activated carbon, the desorption comprising a preheating stage in which a charge of inert gas is circulated in a closed loop through the activated carbon until its content of impurity reaches a predetermined threshold, and an elution stage in which a stream of inert gas is circulated through the activated carbon and sent to said refrigerating trap (2).
Claim 11
Dependent Claim
106 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap (2) maintained at a temperature of condensation of said impurity and cooled by vaporization of said inert gas stored in the liquid form, at least a part of the inert gas thus vaporized being used for effecting the desorption of the activated carbon, and circulating a charge of inert gas in a closed loop through the activated carbon during the heating stage and/or during the cooling stage.
Claim 12
Dependent Claim
106 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap (2) maintained at a temperature of condensation of said impurity and cooled by vaporization of said inert gas stored in the liquid form, at least a part of the inert gas thus vaporized being used for effecting the desorption of the activated carbon, and circulating a charge of inert gas in a closed loop through the activated carbon during the heating stage and/or during the cooling stage.
Claim 13
Dependent Claim
108 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap (2) maintained at a temperature of condensation of said impurity and cooled by vaporization of said inert gas stored in the liquid form, at least a part of the inert gas thus vaporized being used for effecting the desorption of the activated carbon, and passing the desorption gas through a molecular sieve bed (41) between its outlet of the activated carbon and its inlet in the refrigerating trap (2).
Claim 14
Dependent Claim
108 words
A process for eliminating an impurity from a gas by adsorption on activated carbon, characterized in that the activated carbon is desorbed by passing a current of inert gas through the activated carbon and then in a refrigerating trap (2) maintained at a temperature of condensation of said impurity and cooled by vaporization of said inert gas stored in the liquid form, at least a part of the inert gas thus vaporized being used for effecting the desorption of the activated carbon, and passing the desorption gas through a molecular sieve bed (41) between its outlet of the activated carbon and its inlet in the refrigerating trap (2).
Claim 15
Dependent Claim
32 words
A process according to claim 9, characterised in the the molecular sieve (41) is regenerated by means of a heated current of said inert gas, preferably with preheating of the molecular sieve.
Claim 16
Dependent Claim
75 words
A plant for purifying a gas by adsorption, of the type comprising an adsorber vessel (11) filled with activated carbon, characterised in that it comprises means (29) for vaporizing a liquified inert gas, means (13, 20) for feeding the adsorber vessel with at least a part of the thus vaporized inert gas, and means (2) for cooling the gas issuing from said vessel (1) by heat exchange with the inert gas in course of vaporization.
Claim 17
Dependent Claim
75 words
A plant for purifying a gas by adsorption, of the type comprising an adsorber vessel (11) filled with activated carbon, characterised in that it comprises means (29) for vaporizing a liquified inert gas, means (13, 20) for feeding the adsorber vessel with at least a part of the thus vaporized inert gas, and means (2) for cooling the gas issuing from said vessel (1) by heat exchange with the inert gas in course of vaporization.
Claim 18
Dependent Claim
28 words
A plant according to claim 11, characterised in that it comprises means (5, 6) for circulating in a closed loop the gas contained in the adsorber vessel (1).
Claim 19
Dependent Claim
27 words
A plant according to claim 12, characterised in that it comprises a molecular sieve bed (41) interposed between the adsorber vessel 1 and the refrigerating trap (2).
Claim 20
Dependent Claim
60 words
A plant for purifying a gas by adsorption, comprising an adsorber vessel filled with activated carbon, a refrigerating trap, means for feeding the vessel with inert gas, means for heating the activated carbon, means for circulating a charge of inert gas in a closed loop through the activated carbon, and means for sending gas from said vessel to said trap.
Claim 21
Dependent Claim
60 words
A plant for purifying a gas by adsorption, comprising an adsorber vessel filled with activated carbon, a refrigerating trap, means for feeding the vessel with inert gas, means for heating the activated carbon, means for circulating a charge of inert gas in a closed loop through the activated carbon, and means for sending gas from said vessel to said trap.
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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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |