US4410422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing polyhalogenated hydrocarbons from nonpolar organic solvent solutions
Assignee: General Electric Co
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Filing: 1981-10-23
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Granted: 1983-10-18
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Expires: 2001-10-23
Abstract
Abstract A method is provided for reducing the level of polychlorinated aromatic hydrocarbons, "PCB's", while dissolved in an organic solvent, for example, transformer oil. Removal of polychlorinated aromatic hydrocarbon from the contaminated organic solvent can be accomplished by treating the contaminated solution with a mixture of alkali mercaptide in the presence of a phase transfer catalyst.
Inventors
- 👤 Daniel J. Brunelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:42
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/30; A62D3/34; C; C10; C10G; C10G19/00; C10G19/02; C10G19/04; C10G29/00; C10G29/20; C10G29/28; A62D2101/00; A62D2101/20; A62D2101/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
A method of treating a PCB-contaminated solution of a substantially inert non-polar organic solvent having a concentration of polyhalogenated aromatic hydrocarbon at up to 1% by weight to reduce the polyhalogenated aromatic hydrocarbon concentration to less than 50 ppm, which comprises agitating at a temperature of 65° C. to 200° C. a mixture which comprises, by weight, (A) up to 1% of polyhalogenated aromatic hydrocarbon, (B) about 0.1 to 10% of RSH, where R is a C 2-20 hydrocarbon radical, (C) about 0.1 to 10% of alkali metal hydroxide, (D) about 0.1 to 20% of a phase transfer catalyst, and (E) about 80-99.7% of substantially inert non-polar organic solvent, where the sum of (A)+(B)+(C)+(D)+(E) is equal to 100%.
Claim 2
Independent Claim
118 words
A method of treating a PCB-contaminated solution of a substantially inert non-polar organic solvent having a concentration of polyhalogenated aromatic hydrocarbon at up to 1% by weight to reduce the polyhalogenated aromatic hydrocarbon concentration to less than 50 ppm, which comprises agitating at a temperature of 65° C. to 200° C. a mixture which comprises, by weight, (A) up to 1% of polyhalogenated aromatic hydrocarbon, (B) about 0.1 to 10% of RSH, where R is a C 2-20 hydrocarbon radical, (C) about 0.1 to 10% of alkali metal hydroxide, (D) about 0.1 to 20% of a phase transfer catalyst, and (E) about 80-99.7% of substantially inert non-polar organic solvent, where the sum of (A)+(B)+(C)+(D)+(E) is equal to 100%.
Claim 3
Dependent Claim
13 words
A method in accordance with claim 1, where R is a phenyl radical.
Claim 4
Dependent Claim
15 words
A method in accordance with claim 1, where the alkali metal hydroxide is potassium hydroxide.
Claim 5
Dependent Claim
15 words
A method in accordance with claim 1, where the polyhalogenate aromatic hydrocarbon is chlorinated biphenyl.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 1, where the nonpolar organic solvent is transformer oil.
References Cited (Backward Citations)
CA564683A
Cited
US4337368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |