US4758420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of polychlorinated organic compounds from porous materials
Assignee: Dow Chemical Co
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Filing: 1986-07-14
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Granted: 1988-07-19
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Expires: 2006-07-14
Abstract
Abstract The present invention relates to a process for the solvent extraction of polychlorinated organic compounds from porous materials. Specifically, the present invention describes a process for the use of a solvent extraction of polychlorinated organic compounds, such as hexachloroethane, hexachlorobutadiene and hexachlorobenzene from porous materials, such as a vinyl ester resin. When the level of hexachlorinated organic compounds is reduced to a level of 7 ppm or below, the porous material may be disposed of in an environmentally acceptable manner such as by incineration or by landfill.
Inventors
- 👤 Vera M. Knowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:35
CPC Classifications
B; B09; B09C; B09C1/00; B09C1/02; B09B; B09B3/00; B09B3/80
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
127 words
A method of reducing the level of hexachlorinated organic compounds selected from hexachloroethane, hexachlorobutadiene, hexachlorobenzene, or mixtures thereof to a non-hazardous level in a solid, porous DERAKANE® vinyl ester resin, which has been previously used as the material of construction of a cell to produce chlorine, which vinyl ester resin was in contact with chlorine during chlorine manufacture which method comprises: (a) contacting the hexachlorinated compound-containing porous vinyl ester resin with an extraction solvent wherein the extraction solvent is selected from chloroform, carbon tetrachloride, trichlorethane, methyl chloroform, tetrachloroethane, perchloroethylene, benzene, toluene, xylene, acetone, methyl ethyl ketone, or mixtures thereof, at a temperature and for a time sufficient to remove the absorbed hexachlorinated organic compound; and (b) separating the hexachlorinated organic compound-containing extraction solvent and vinyl ester resin.
Claim 2
Independent Claim
127 words
A method of reducing the level of hexachlorinated organic compounds selected from hexachloroethane, hexachlorobutadiene, hexachlorobenzene, or mixtures thereof to a non-hazardous level in a solid, porous DERAKANE® vinyl ester resin, which has been previously used as the material of construction of a cell to produce chlorine, which vinyl ester resin was in contact with chlorine during chlorine manufacture which method comprises: (a) contacting the hexachlorinated compound-containing porous vinyl ester resin with an extraction solvent wherein the extraction solvent is selected from chloroform, carbon tetrachloride, trichlorethane, methyl chloroform, tetrachloroethane, perchloroethylene, benzene, toluene, xylene, acetone, methyl ethyl ketone, or mixtures thereof, at a temperature and for a time sufficient to remove the absorbed hexachlorinated organic compound; and (b) separating the hexachlorinated organic compound-containing extraction solvent and vinyl ester resin.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the hexachlorinated organic compound is substantially hexachloroethane.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the extraction solvent is methyl chloroform.
Claim 5
Dependent Claim
11 words
The method of claim 2 wherein the extraction solvent is perchloroethylene.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein the non-hazardous level of hexachlorinated organic compound is less than 50 ppm.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein the temperature in step (a) is between about 10° and 30° C.
Claim 8
Independent Claim
147 words
A method for the disposal of DERAKANE® vinyl ester resin which has been previously used as the material of construction of a cell to produce elemental chlorine, which vinyl ester resin was in direct contact with the elemental chlorine during chlorine production, and is contaminated with hexachlorinated organic compounds wherein the hexachlorinated organic compound is selected from hexachloroethane, hexachlorobutadiene, hexachlorobenzene, or mixtures thereof, which method comprises: (a) contacting the hexachlorinated organic compound-containing vinyl ester resin with an extraction solvent is selected from chloroform, carbon tetrachloride, trichloroethane, methyl chloroform, tetrachloroethane, perchloroethylene, benzene, toluene, xylene, or mixtures thereof, at a temperature and for a time sufficient to reduce the level of hexachlorinated organic compound in the porous material to an environmentally acceptable level; (b) separating the extraction solvent and vinyl ester resin; and (c) disposing of the treated vinyl ester resin of step (b) in an environmentally acceptable manner.
Claim 9
Independent Claim
147 words
A method for the disposal of DERAKANE® vinyl ester resin which has been previously used as the material of construction of a cell to produce elemental chlorine, which vinyl ester resin was in direct contact with the elemental chlorine during chlorine production, and is contaminated with hexachlorinated organic compounds wherein the hexachlorinated organic compound is selected from hexachloroethane, hexachlorobutadiene, hexachlorobenzene, or mixtures thereof, which method comprises: (a) contacting the hexachlorinated organic compound-containing vinyl ester resin with an extraction solvent is selected from chloroform, carbon tetrachloride, trichloroethane, methyl chloroform, tetrachloroethane, perchloroethylene, benzene, toluene, xylene, or mixtures thereof, at a temperature and for a time sufficient to reduce the level of hexachlorinated organic compound in the porous material to an environmentally acceptable level; (b) separating the extraction solvent and vinyl ester resin; and (c) disposing of the treated vinyl ester resin of step (b) in an environmentally acceptable manner.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein the hexachlorinated organic compound is substantially hexachloroethane.
Claim 11
Dependent Claim
11 words
The method of claim 8 wherein the extraction solvent is trichloroethane.
Claim 12
Dependent Claim
11 words
The method of claim 8 wherein the extraction solvent comprises perchloroethylene.
Claim 13
Dependent Claim
24 words
The method of claim 10 wherein in step (a) the environmentally acceptable level of hexachlorinated to decachlorinated organic compound is less than 7 ppm.
Claim 14
Dependent Claim
18 words
The method of claim 11 wherein the temperature in step (a) is between about 10° and 30° C.
Claim 15
Dependent Claim
17 words
The method of claim 12 wherein in step (c) the environmentally acceptable manner of disposal is landfill.
Claim 16
Dependent Claim
16 words
The method of claim 11 in step (c) the environmentally acceptable manner of disposal is incineration.
Claim 17
Dependent Claim
14 words
The method of claim 8 wherein in step (a) the extraction solvent is methylchloroform.
Claim 18
Dependent Claim
30 words
The method of claim 15 wherein in step (a) the temperature is between about 10° and 30° C. and the time of extraction is between about 10 and 120 minutes.
Claim 19
Dependent Claim
16 words
The method of claim 16 wherein the separated extraction solvent of step (b) is subsequently recycled.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |