US4267055A
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Separation of more planar molecules from less planar molecules
Assignee: Rohm and Haas Co
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Filing: 1979-09-04
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Granted: 1981-05-12
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Expires: 1999-09-04
Abstract
Abstract Planar organic molecules, such as divinylbenzene or para-dioxin molecules, are adsorbed from mixtures of planar and non-planar molecules, such as commercial divinylbenzenes containing non-planar ethylvinylbenzene, or commercial 2,4,5-T herbicide containing non-planar 2,4,5-trichlorophenoxyacetic acid, by partially pyrolyzed, macroporous, resinous polymer particles.
Inventors
- 👤 James W. Neely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:18
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/40; C07C59/58; C07C59/64; C07C59/66; C07C59/68; C07C59/70; B; B01; B01D; B01D53/00; B01D53/02; B01J; B01J20/00; B01J20/22; B01J20/26; C07C7/00; C07C7/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A process for selectively removing planar molecules from a mixture containing planar and non-planar molecules which comprises contacting the mixture with a particulate adsorbent which is the product of controlled thermal degradation, at a temperature of about 500° C. or greater, of a macroporous synthetic polymer containing macropores ranging from about 50 to about 100,000 Angstroms in average critical dimension, and a carbon-fixing moiety, and derived from one or more ethylenically unsaturated monomers, or monomers which may be condensed to yield macroporous polymers, or mixtures thereof, until planar molecules have been selectively adsorbed, and subsequently separating the adsorbent from the mixture.
Claim 2
Dependent Claim
101 words
A process for selectively removing planar molecules from a mixture containing planar and non-planar molecules which comprises contacting the mixture with a particulate adsorbent which is the product of controlled thermal degradation, at a temperature of about 500° C. or greater, of a macroporous synthetic polymer containing macropores ranging from about 50 to about 100,000 Angstroms in average critical dimension, and a carbon-fixing moiety, and derived from one or more ethylenically unsaturated monomers, or monomers which may be condensed to yield macroporous polymers, or mixtures thereof, until planar molecules have been selectively adsorbed, and subsequently separating the adsorbent from the mixture.
Claim 3
Dependent Claim
26 words
The process according to claim 1 wherein the particulate adsorbent is the product of controlled thermal degradation at from about 800° C. to about 1200° C.
Claim 4
Dependent Claim
20 words
The process according to claim 1 wherein the macroporous synthetic polymer is derived from a mixture of styrene and divinylbenzene.
Claim 5
Dependent Claim
12 words
The process according to claim 1 wherein the carbon-fixing moiety is sulfonate.
Claim 6
Dependent Claim
21 words
The process according to claim 4 wherein sulfuric acid is imbibed into the pores of the polymer prior to thermal degradation.
Claim 7
Dependent Claim
34 words
The process according to claim 1 wherein the planar molecules are divinylbenzene molecules and the mixture containing planar and non-planar molecules is a mixture of divinylbenzene and a minor amount of at least ethylvinylbenzene.
Claim 8
Dependent Claim
23 words
The process according to claim 6 wherein the adsorbed planar molecules are eluted from the adsorbent subsequent to its separation from the mixture.
Claim 9
Dependent Claim
41 words
The process according to claim 1 wherein the planar molecules are halogenated dibenzo-p-dioxin molecules and the mixture containing planar and non-planar molecules is a mixture of 2,4,5-trichlorophenoxyacetic acid or its water-soluble salts, and a minor amount of at least halogenated dibenzo-p-dioxin.
Claim 10
Dependent Claim
44 words
The process according to claim 1 wherein the planar molecules are inhibitors selected from the group consisting of quinone, hydroquinone, hydroquinone methyl ester, and mixtures thereof, and the mixture containing planar and non-planar molecules is an acrylic monomer inhibited with an inhibitor recited above.
Claim 11
Dependent Claim
32 words
The process according to claim 1 wherein the planar molecules are molecules of hydroquinone methyl ester and the mixture containing planar and non-planar molecules is methyl methacrylate inhibited with hydroquinone methyl ester.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |