Patent AT175037B successfully refreshed from Google Patents.
US4286972A
Expired / Lapsed
US
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Vapor phase adsorption using nonstoichiometric carbon-sulfur compounds
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1978-01-03
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Granted: 1981-09-01
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Expires: 1998-01-03
Abstract
Abstract Nonstoichiometric carbon-sulfur compounds have been found to be effective adsorbents for separating organic vapors from a gaseous mixture. Separation of aromatic compounds from gaseous mixtures is particularly effective using such compounds. The spent adsorbent may then be regenerated.
Inventors
- 👤 David W. Savage
- 👤 Chin H. Chang
- 👤 John M. Longo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:51
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; B01D; B01D53/00; B01D53/02
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
56 words
A process for regenerating a nonstoichiometric carbon-sulfur compound of the formula C x S, where x ranges from about 4 to about 15, the adsorptive capacity of said compound having become reduced due to the adsorption of organic vapors thereon, which comprises removing at least a portion of said adsorbed vapors from said nonstoichiometric carbon-sulfur compound.
Claim 2
Dependent Claim
56 words
A process for regenerating a nonstoichiometric carbon-sulfur compound of the formula C x S, where x ranges from about 4 to about 15, the adsorptive capacity of said compound having become reduced due to the adsorption of organic vapors thereon, which comprises removing at least a portion of said adsorbed vapors from said nonstoichiometric carbon-sulfur compound.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein x ranges from about 4 to about 10.
Claim 4
Dependent Claim
35 words
The process of claim 1 wherein the C x S has a surface area ranging between 300 and 2500 square meters per gram and a pore volume of at least 0.2 cubic centimeters per gram.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein said removal is effected by contacting said nonstoichiometric carbon-sulfur compound with a stripping gas.
Claim 6
Dependent Claim
23 words
The process of claim 4 wherein said stripping gas is selected from the group consisting of steam, inert gas, alcohols and mixtures thereof.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein said stripping gas comprises steam.
Claim 8
Dependent Claim
24 words
the process of claim 1 wherein said removal is effected by heating said compound to a temperature between about 70° and about 1200° F.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein said compound is heated to a temperature between 150° and 700° F.
Claim 10
Dependent Claim
15 words
The process of claim 7 wherein an inert gas is used as a heat carrier.
Claim 11
Dependent Claim
18 words
The process of claim 1 wherein said removal is effected by contacting said compound with a liquid solvent.
Claim 12
Dependent Claim
12 words
The process of claim 10 wherein said liquid solvent is a hydrocarbon.
Claim 13
Dependent Claim
29 words
The process of claim 11 wherein said liquid solvent is a branched hydrocarbon having at least one trisubstituted carbon atom, at least one tetra-substituted carbon atom or mixtures thereof.
Claim 14
Dependent Claim
19 words
The process of claim 10 wherein the temperature during said contacting ranges from about 70° to about 700° F.
Claim 15
Dependent Claim
21 words
The process of claim 10 wherein the organic vapors removed from said nonstoichiometric carbon-sulfur compound are recovered from said liquid solvent.
Claim 16
Dependent Claim
98 words
A process for removing organic vapors from a gaseous mixture which comprises (a) contacting said mixture with a nonstoichiometric carbon-sulfur compound of the formula C x S, where x ranges from 4 to about 15, said compound having a surface area of at least 300 square meters per gram, for a period of time sufficient to adsorb at least a portion of said organic vapors from said mixture onto said compound, thereby reducing the adsorptive capacity of said compound, (b) regenerating said nonstoichiometric carbon-sulfur compound by removing at least a portion of said organic vapors from said compound.
Claim 17
Dependent Claim
98 words
A process for removing organic vapors from a gaseous mixture which comprises (a) contacting said mixture with a nonstoichiometric carbon-sulfur compound of the formula C x S, where x ranges from 4 to about 15, said compound having a surface area of at least 300 square meters per gram, for a period of time sufficient to adsorb at least a portion of said organic vapors from said mixture onto said compound, thereby reducing the adsorptive capacity of said compound, (b) regenerating said nonstoichiometric carbon-sulfur compound by removing at least a portion of said organic vapors from said compound.
Claim 18
Dependent Claim
13 words
The process of claim 15 wherein x ranges from 4 to about 10.
Claim 19
Dependent Claim
36 words
The process of claim 15 wherein the C x S has a surface area ranging from 300 to about 2500 square meters per gram and a pore volume of at least 0.2 cubic centimeters per gram.
Claim 20
Dependent Claim
27 words
The process of claim 15 wherein said organic vapors are selected from the group consisting of aromatic hydrocarbons, phenolic hydrocarbons, halogenated hydrocarbons, nitrated hydrocarbons and mixtures thereof.
Claim 21
Dependent Claim
20 words
The process of claim 18 wherein said removal is effected by contacting said carbon-sulfur compound with a liquid hydrocarbon solvent.
Claim 22
Dependent Claim
41 words
The process of claim 15 wherein the contacting in (a) is effected at a pressure ranging from about 300 to about 1500 psia and the regeneration in (b) is effected at a pressure ranging between about 0 to about 200 psia.
Claim 23
Dependent Claim
23 words
The process of claim 15 wherein the pressure ratio of the contacting in (a) to the regeneration in (b) is at least 2:1.
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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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |