Patent US1815616A successfully refreshed from Google Patents.
US4401570A
Expired / Lapsed
US
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Removal of organic contaminants from waste water
Assignee: Shell USA Inc
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Filing: 1982-05-26
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Granted: 1983-08-30
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Expires: 2002-05-26
Abstract
Abstract An aqueous alkaline waste stream containing at least organic ester having insecticidal properties is acidified and extracted with a C 5 -C 10 hydrocarbon to reduce the organic content of the waste stream.
Inventors
- 👤 George C. Blytas
- 👤 Ronald K. June
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:51
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/26; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A process for reducing the total organics content of an aqueous alkali waste stream containing at least one organic ester having insectidical properties selected from the group consisting of α-cyano-3-phenoxy-benzyl 2-(4-chlorophenyl)-3-methylbutanoate, α-cyano-3-phenoxybenzyl 2,2,3,3-tetramethyl cyclopropane carboxylate and α-cyano-3-phenoxybenzyl 2-(2,2-dichlorovinyl)-3,3-dimethyl cyclopropane carboxylate which process comprises adjusting the pH of said stream in the range from about 2.5 to 5.5 extracting said stream with a C 5 to C 10 hydrocarbon, by contacting in a volume ratio of hydrocarbon to water between about 0.2:1 and 5:1, and separating an aqueous product having a lower content of total organics and of said at least one organic ester than said waste stream.
Claim 2
Dependent Claim
107 words
A process for reducing the total organics content of an aqueous alkali waste stream containing at least one organic ester having insectidical properties selected from the group consisting of α-cyano-3-phenoxy-benzyl 2-(4-chlorophenyl)-3-methylbutanoate, α-cyano-3-phenoxybenzyl 2,2,3,3-tetramethyl cyclopropane carboxylate and α-cyano-3-phenoxybenzyl 2-(2,2-dichlorovinyl)-3,3-dimethyl cyclopropane carboxylate which process comprises adjusting the pH of said stream in the range from about 2.5 to 5.5 extracting said stream with a C 5 to C 10 hydrocarbon, by contacting in a volume ratio of hydrocarbon to water between about 0.2:1 and 5:1, and separating an aqueous product having a lower content of total organics and of said at least one organic ester than said waste stream.
Claim 3
Dependent Claim
17 words
A process as in claim 1 wherein said C 5 -C 10 hydrocarbon is substantially aliphatic hydrocarbon.
Claim 4
Dependent Claim
26 words
A process as in claim 1 wherein the extracting step comprises counter-current contacting in a volume ratio of hydrocarbon to water between about 0.5:1 to 2:1.
Claim 5
Dependent Claim
47 words
A process as in claim 1 wherein the extracting step comprises a first extracting stage with simultaneous adjustment of pH of the waste stream in the range from about 2.6 to about 3.6, then separating the hydrocarbon extractant, followed by a second extracting stage with additional hydrocarbon.
Claim 6
Dependent Claim
49 words
A process as in claim 1 which after separating said product: comprises the following additional steps: regenerating by fractional distillation the hydrocarbon which was separated from the extracting step to recover a substantially ester-free distillate product, and then recycling said distillate product to the extracting step of claim 1.
Claim 7
Dependent Claim
16 words
A process as in claim 1 wherein said waste stream contains 10-20,000 ppmw of organic compounds.
Claim 8
Dependent Claim
18 words
A process as in claim 1 wherein said waste stream contains at least one cyano-substituted carboxylic acid ester.
Claim 9
Dependent Claim
20 words
A process as in claim 1 wherein said waste stream contains from 1-10% w of inorganic salts of alkali metals.
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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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |