Patent US4502340A successfully refreshed from Google Patents.
Patent US4436534A successfully refreshed from Google Patents.
US4436534A
Expired / Lapsed
US
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Method for reducing desorbent consumption in recovery systems
Assignee: Wheelabrator Clean Air Systems Inc
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Filing: 1982-11-08
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Granted: 1984-03-13
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Expires: 2002-11-08
Abstract
Abstract Methods for reducing the consumption of desorbent such as live steam during the desorption operation of recovery systems for chemical substances by reducing or terminating the input of desorbent to the adsorber at a predetermined time, such as when the level of chemical substance in the desorbent/chemical substance mixture leaving the adsorber reaches a predetermined low level, and recirculating through the adsorber a portion of the exiting desorbent/chemical substance mixture by the use of a propelling means.
Inventors
- 👤 Bernard R. Seguy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:07
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D2253/00; B01D2253/10; B01D2253/102; B01D2259/00; B01D2259/40; B01D2259/402; B01D53/0407; B01D53/0423; B01D53/0438
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
123 words
In a desorption stage in the operation of a system for recovering a chemical substance from a carrier medium, wherein an externally supplied desorbent used in the desorption of an adsorber in said system is heated prior to its introduction to said adsorber, the method for reducing consumption of said preheated desorbent during the desorption of said adsorber comprising the steps of: initiating a flow of said preheated desorbent through the adsorber to commence the desorption operation; reducing the flow of said preheated desorbent entering the adsorber at a predetermined time during the desorption operation; and recirculating through the adsorber for a predetermined time a portion of the mixture leaving the adsorber, without heating said portion, to effect further desorption of the adsorber.
Claim 2
Dependent Claim
123 words
In a desorption stage in the operation of a system for recovering a chemical substance from a carrier medium, wherein an externally supplied desorbent used in the desorption of an adsorber in said system is heated prior to its introduction to said adsorber, the method for reducing consumption of said preheated desorbent during the desorption of said adsorber comprising the steps of: initiating a flow of said preheated desorbent through the adsorber to commence the desorption operation; reducing the flow of said preheated desorbent entering the adsorber at a predetermined time during the desorption operation; and recirculating through the adsorber for a predetermined time a portion of the mixture leaving the adsorber, without heating said portion, to effect further desorption of the adsorber.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the chemical substance is a solvent.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the desorbent is live steam.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the adsorber includes an adsorbent bed comprising activated carbon.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein the flow of desorbent entering the adsorber is reduced in response to the level of chemical substance in the mixture leaving the adsorber reaching a predetermined level.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the manner of reduction of the flow of desorbent entering the adsorber is predetermined.
Claim 8
Dependent Claim
23 words
The method of claim 6 wherein the predetermined manner of reduction of the flow of desorbent entering the adsorber is a constant rate.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein the flow of desorbent entering the adsorber is terminated at said predetermined level.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein the duration of the recirculation period is dependent upon the level of chemical substance in the mixture leaving the adsorber reaching a predetermined level.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein the entire amount of mixture leaving the adsorber is recirculated.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein the portion of mixture recirculated is variable.
Claim 13
Dependent Claim
17 words
The method of claim 1 wherein the recirculation is assisted by the use of a propelling means.
Claim 14
Dependent Claim
14 words
The method of claim 12 wherein the propelling means is a desorbent jet ejector.
Claim 15
Dependent Claim
13 words
The method of claim 12 wherein the propelling means is a mechanical compressor.
Claim 16
Dependent Claim
19 words
The method of claim 1 wherein the recirculated portion of the mixture leaving the adsorber is supplemented with desorbent.
Claim 17
Dependent Claim
28 words
The method of claim 15 wherein the flow of desorbent supplementing the recirculated mixture is less than the flow of desorbent entering the adsorber prior to its reduction.
Claim 18
Dependent Claim
18 words
The method of claim 1 wherein a portion of the mixture leaving the adsorber is diverted for processing.
Claim 19
Dependent Claim
16 words
The method of claim 17 wherein the processing includes passing the diverted mixture through a condenser.
Claim 20
Dependent Claim
17 words
The method of claim 1 wherein following the recirculation period the adsorber is prepared for further adsorption.
Claim 21
Dependent Claim
20 words
The method of claim 19 wherein following the recirculation period the adsorber is placed in a cooling and drying state.
Claim 22
Dependent Claim
20 words
The method of claim 1 wherein following the recirculation period desorbent is passed through the adsorber for a predetermined time.
Claim 23
Dependent Claim
29 words
The method of claim 21 wherein the duration of the period of resumed desorbent flow is dependent upon the level of chemical substance in the mixture leaving the adsorber.
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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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |