US3768232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent recovery system
Assignee: Triton Group Ltd
•
Filing: 1972-01-06
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Granted: 1973-10-30
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Expires: 1992-01-06
Abstract
Abstract A solvent recovery system comprising an adsorbent bed for stripping the solvent from an air stream and a vacuum distillation and condensation unit for desorbing the solvent from the bed and recovering the solvent for reuse and regenerating the bed for the next adsorption cycle.
Inventors
- 👤 M Farber
- 👤 A Bush
- 👤 F Wiens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:19
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D2253/00; B01D2253/10; B01D2253/102; B01D2256/00; B01D2256/24; B01D2259/00; B01D2259/40; B01D2259/401; B01D2259/404
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
51 words
A system in accordance with claim 1 in which the adsorbent bed means includes a closed container including a bed receiving chamber and having a carrier gas inlet disposed at one side of said chamber, carrier gas outlet disposed to an opposite side of said chamber and a distilled vapor outlet.
Claim 2
Dependent Claim
55 words
A system in accordance with claim 2 in which the carrier gas inlet and distilled vapor outlet are combined and further including a first valve disposed in the carrier gas outlet and a two-way isolation valve disposed in the combined inlet-outlet for selectively communicating said container with said inlet and with said distilled vapor outlet.
Claim 3
Dependent Claim
23 words
A system in accordance with claim 2 in which said adsorbent bed means is formed of a body of activated granular carbon adsorbent.
Claim 4
Dependent Claim
17 words
A system in accordance with claim 2 further including heating means extending through the adsorbent bed means.
Claim 5
Dependent Claim
20 words
A system in accordance with claim 2 in which the heating means includes a plurality of electrical resistance heating rods.
Claim 6
Dependent Claim
21 words
A system in accordance with claim 6 further including fins attached to said rods and extending into the bed of adsorbent.
Claim 7
Dependent Claim
30 words
A system in accordance with claim 2 further including pump means disposed in said carrier gas outlet for inducing the flow of said carrier gas through said adsorbent bed means.
Claim 8
Dependent Claim
23 words
A system in accordance with claim 1 in which said vacuum distillation means includes a vacuum pump connected to the said condensing means.
Claim 9
Dependent Claim
25 words
A system in accordance with claim 9 further including recycle conduit means connecting the output of said vacuum pump to the said carrier gas inlet.
Claim 10
Dependent Claim
37 words
A system in accordance with claim 3 in which said system includes a plurality of said adsorbent bed means and a manifold means independently connecting the two-way isolation valve on each container to the vacuum distillation means.
Claim 11
Dependent Claim
25 words
A system in accordance with claim 11 further including servo means connected to each of said first valves and each of said two-wAy isolation valves.
Claim 12
Independent Claim
94 words
A method of recovering solvent from the output of an industrial process comprising the steps of: flowing vaporized solvent through at least one bed of solid adsorbent to adsorb the solvent thereon; vacuum distilling the adsorbed solvent from the bed including the steps of: reducing the atmospheric pressure on said bed until the boiling temperature of the solvent adsorbed reaches a predetermined value; and heating said bed and solvent to said boiling temperature value or above until said solvent is distilled from said bed; condensing the distilled solvent vapor; and collecting the condensed solvent.
Claim 13
Dependent Claim
24 words
A method in accordance with claim 13 further comprising dispersing the vaporized solvent in a carrier gas and flowing the dispersion through the bed.
Claim 14
Dependent Claim
35 words
A method in accordance with claim 14 in which the carrier gas is air, the adsorbent comprises a bed of activated carbon and the solvent is an alkane oil containing at least 10 carbon atoms.
Claim 15
Dependent Claim
32 words
A method according to claim 13 in which the vacuum distillation is conducted at a pressure below 50 torr and a temperature above the boiling point of the solvent at said pressure.
Claim 16
Dependent Claim
28 words
A method according to claim 16 in which the pressure is below 5 torr and the temperature is at least 100*F above the boiling point of the solvent.
Claim 17
Dependent Claim
23 words
A method according to claim 14 in which the dispersion is induced through the bed by a pump disposed downstream from the bed.
Claim 18
Dependent Claim
25 words
A method according to claim 13 in which the vacuum for vacuum distilling is applied to the bed from a point downstream of the condenser.
Claim 19
Dependent Claim
37 words
A method according to claim 13 further including a plurality of said beds and simultaneously adsorbing the solvent from at least one of said beds and vacuum distilling the solvent from at least one of said beds.
Claim 20
Dependent Claim
45 words
A method according to claim 14 in which the flow of dispersion is continued until the bed contains 25-50 parts by weight of solvent for each 100 parts by weight of adsorbent and then the bed is vacuum distilled to desorb and collect the solvent.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |