US4820318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of organic compounds from gas streams using carbon molecular sieves
Assignee: Honeywell International Inc
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Filing: 1987-12-24
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Granted: 1989-04-11
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Expires: 2007-12-24
Abstract
Abstract Volatile organic compounds such as ketones and fluorocarbons are removed from vapor streams by contacting the vapor stream with a bed of an adsorbent comprising a binderless carbon molecular sieve. The carbon molecular sieves are characterized by their method of manufacture which includes forming a polymer from oxygen-free precursors and carbonizing directly to the finished sieve material in the absence of oxygen.
Inventors
- 👤 Chin-Hsiung Chang
- 👤 Gary J. Seminara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:44
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01J; B01J20/00; B01J20/02; B01J20/20; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902; Y10S95/903
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
128 words
A process for removing a volatile organic compound from a gas stream which comprises contacting the gas stream at adsorption-promoting conditions with a bed of an adsorbent comprising a carbon molecular sieve which has been manufactured by a method comprising the steps of: (a) polymerizing a cross-linking agent and a precursor monomer, with both the cross-linking agent and the monomer being essentially free of molecular oxygen, and producing a cross-linked polymer; (b) shaping a quantity of the polymer into an article having a desired configuration without employing a binder material; and, (c) carbonizing the resultant shaped article into a finished product comprising carbon molecular sieves and having a density of 0.7-1.05 gm/ml, an average pore volume of 0.4-0.8 cc/gm and having the same overall shape as the article.
Claim 2
Dependent Claim
128 words
A process for removing a volatile organic compound from a gas stream which comprises contacting the gas stream at adsorption-promoting conditions with a bed of an adsorbent comprising a carbon molecular sieve which has been manufactured by a method comprising the steps of: (a) polymerizing a cross-linking agent and a precursor monomer, with both the cross-linking agent and the monomer being essentially free of molecular oxygen, and producing a cross-linked polymer; (b) shaping a quantity of the polymer into an article having a desired configuration without employing a binder material; and, (c) carbonizing the resultant shaped article into a finished product comprising carbon molecular sieves and having a density of 0.7-1.05 gm/ml, an average pore volume of 0.4-0.8 cc/gm and having the same overall shape as the article.
Claim 3
Dependent Claim
35 words
The process of claim 1 further characterized in that the adsorption-promoting conditions include a pressure of from about 1.0 to 10 atmospheres absolute and a temperature of from about -20 to about 40 degrees C.
Claim 4
Dependent Claim
16 words
The process of claim 2 further characterized in that the volatile organic compound contains a halogen.
Claim 5
Dependent Claim
16 words
The process of claim 3 further characterized in that the volatile organic compound is a fluorocarbon.
Claim 6
Dependent Claim
42 words
The process of claim 2 further characterized in that the volatile organic compound is chosen from the group consisting of C 1 -C 3 ketones, C 1 -C 3 alcohols, C 1 -C 3 aldehydes, C 2 -C 7 alkanes and nitromethane.
Claim 7
Dependent Claim
22 words
The process of claim 1 further characterized in that the organic compound is present in a gas stream comprising oxygen and nitrogen.
Claim 8
Dependent Claim
13 words
The process of claim 2 further characterized in that the adsorbent is hydrophobic.
Claim 9
Dependent Claim
20 words
The process of claim 1 further characterized in that the carbonization step is preformed in the substantial absence of oxygen.
Claim 10
Dependent Claim
22 words
The process of claim 1 further characterized in that a bulk or solution method of polymerization is employed in the cross-linking step.
Claim 11
Dependent Claim
20 words
The process of claim 9 further characterized in that the carbonization step is performed in the substantial absence of oxygen.
Claim 12
Dependent Claim
16 words
The process of claim 10 further characterized in that the monomer is a vinyl chloride monomer.
Claim 13
Dependent Claim
17 words
The process of claim 11 further characterized in that divinyl benzene is employed as the cross-linking agent.
Claim 14
Dependent Claim
14 words
The process of claim 10 further characterized in that the monomer is vinylidene chloride.
Claim 15
Dependent Claim
28 words
The process of claim 1 further characterized in that the article is held at a temperature above 800degrees C. for at least one hour during the carbonization step.
Claim 16
Dependent Claim
25 words
The process of claim 14 further characterized in that the weight of the article is reduced by at least 60 percent during the carbonization step.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |