Patent US4532028A successfully refreshed from Google Patents.
US4532028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing content of halogenated aromatics in hydrocarbon solutions
Assignee: Niagara Mohawk Power Corp
•
Filing: 1983-10-24
•
Granted: 1985-07-30
•
Expires: 2003-10-24
Abstract
Abstract The level of halogenated aromatics is reduced in a hydrocarbon stream by treatment with an alkaline reactant in a sulfoxide solvent.
Inventors
- 👤 Robert L. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:02
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/30; A62D3/34; C; C10; C10G; C10G19/00; A62D2101/00; A62D2101/20; A62D2101/22; A62D2101/28; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
Method for reducing the content of halogenated aromatic hydrocarbons in a hydrocarbon solution which comprises heating under agitation a hydrocarbon solution having therein up to about 50,000 parts per million of said solution of halogenated aromatic hydrocarbon as a contaminant with a nonaqueous alkaline reactant in a sulfoxide solvent, said alkaline reactant selected from the group consisting of (i) an alkali metal alcoholate, (ii) a mixture of an alkali metal hydroxide and an alcohol or (iii) mixtures thereof.
Claim 2
Dependent Claim
78 words
Method for reducing the content of halogenated aromatic hydrocarbons in a hydrocarbon solution which comprises heating under agitation a hydrocarbon solution having therein up to about 50,000 parts per million of said solution of halogenated aromatic hydrocarbon as a contaminant with a nonaqueous alkaline reactant in a sulfoxide solvent, said alkaline reactant selected from the group consisting of (i) an alkali metal alcoholate, (ii) a mixture of an alkali metal hydroxide and an alcohol or (iii) mixtures thereof.
Claim 3
Dependent Claim
14 words
The method of claim 1 in which said hydrocarbon solution is a transformer oil.
Claim 4
Dependent Claim
15 words
The method of claim 1 in which said halogenated aromatic hydrocarbon is a polychlorinated biphenyl.
Claim 5
Dependent Claim
14 words
The method of claim 1 in which the sulfoxide is a lower alkyl sulfoxide.
Claim 6
Dependent Claim
12 words
The method of claim 4 in which the sulfoxide is dimethyl sulfoxide.
Claim 7
Dependent Claim
21 words
The method of claim 1 in which the reaction is conducted at a reaction temperature from about 25° to 200° C.
Claim 8
Dependent Claim
20 words
The method of claim 6 in which the reaction is conducted at temperatures from about 90° C. to 120° C.
Claim 9
Dependent Claim
16 words
The method of claim 1 in which the alkaline reactant is an alkali metal lower alkanoate.
Claim 10
Dependent Claim
19 words
The method of claim 1 in which the alkaline reactant is an alkali metal hydroxide and a polyethylene glycol.
Claim 11
Dependent Claim
52 words
The method of claim 1 including the steps of separating the mixture after reaction into a hydrocarbon phase and a solvent phase; removing insoluble reaction product from the solvent; adding additional alkaline reactant to said purified solvent phase and recycling the solvent phase and the hydrocarbon phase for removal of remaining contaminant.
Claim 12
Dependent Claim
27 words
The method of claim 1 in which the contaminated hydrocarbon is a transformer oil having therein up to about 5,000 parts per million of a polychlorinated biphenyl.
References Cited (Backward Citations)
US2481300A
Cited
US3481991A
Cited
GB1143170A
Cited
GB1316277A
Cited
JPS4982570A
Cited
US4327027A
Cited
US4337368A
Cited
US4326090A
Cited
US4351718A
Cited
US4353793A
Cited
US4477354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |