US4470909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of halocarbons from aqueous solutions
Assignee: Wyeth Holdings LLC
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Filing: 1982-09-30
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Granted: 1984-09-11
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Expires: 2002-09-30
Abstract
Abstract A method for removing halogenated hydrocarbons from water is disclosed. The method comprises contacting said aqueous solution with a phosphine oxide either alone or on a solid support.
Inventors
- 👤 John H. Bright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:46
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3248; B01D; B01D15/00; C; C02; C02F; C02F1/00; C02F1/28; C02F1/285; C07; C07C; C07C17/00; C07C17/38; C07C17/389; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
66 words
A method for removing halogenated hydrocarbons from aqueous solutions thereof which comprises: (a) contacting said aqueous solutions for a time sufficient to extract said halogenated hydrocarbon with a phosphine oxide compound wherein said phosphine oxide compound has the formula: R.sub.3 P═O wherein the three R groups are each individually alkyl, cycloalkyl, aralkyl and substituted-aralkyl; and (b) separating the extracted aqueous solution from said phosphine oxide compound.
Claim 2
Independent Claim
66 words
A method for removing halogenated hydrocarbons from aqueous solutions thereof which comprises: (a) contacting said aqueous solutions for a time sufficient to extract said halogenated hydrocarbon with a phosphine oxide compound wherein said phosphine oxide compound has the formula: R.sub.3 P═O wherein the three R groups are each individually alkyl, cycloalkyl, aralkyl and substituted-aralkyl; and (b) separating the extracted aqueous solution from said phosphine oxide compound.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein said phosphine oxide is on a solid support.
Claim 4
Dependent Claim
25 words
A method according to claim 2 wherein solid support material is a copolymer of at least one monovinyl compound and at least one polyvinyl compound.
Claim 5
Dependent Claim
14 words
A method according to claim 3 wherein said solid support material is divinylbenzene-cross-linked polystyrene.
Claim 6
Dependent Claim
40 words
A method according to claim 2 wherein said alkyl moiety is branched or linear and contains from about 6 to 18 carbon atoms and where said cycloalkyl moiety contains about 6 to 8 carbon atoms and is substituted or unsubstituted.
Claim 7
Independent Claim
19 words
A method according to claims 1, 2, 3, 4 or 5 wherein said phosphine oxide compound is trialkylphosphine oxide.
Claim 8
Dependent Claim
20 words
A method according to claim 6 wherein said trialkylphosphine oxide is tri-n-octylphosphine oxide or tri-n-hexylphosphine oxide or a mixture thereof.
Claim 9
Dependent Claim
18 words
A method according to claim 2 wherein said inert, solid support material is a naturally occurring inorganic material.
Claim 10
Dependent Claim
13 words
A method according to claim 8 wherein said support material is diatomaceous earth.
Claim 11
Dependent Claim
13 words
A method according to claim 2 wherein said support material is silica gel.
Claim 12
Independent Claim
23 words
A method according to claims 2, 3, 4 or 5 wherein said phosphine oxide compound is incorporated on said support material by impregnation.
Claim 13
Independent Claim
20 words
A method according to claims 3 or 4 wherein said phosphine oxide compound is incorporated on said support by encapsulation.
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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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |