Patent US4025495A successfully refreshed from Google Patents.
US4025495A
Expired / Lapsed
US
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Preparation of organic polysulfide polymers using heavy residues from vinylchloride manufacture
Assignee: Tessenderlo Chemie NV SA
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Filing: 1975-07-07
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Granted: 1977-05-24
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Expires: 1995-07-07
Abstract
Abstract A process for abating a waste disposal problem in the manufacture of vinyl chloride wherein 1,2 dichlorethane is an intermediate and a heavy residue is recovered as still bottoms, said process comprising reacting said heavy residue at 50° to 100° C., in aqueous medium with an alkali metal or an alkaline earth metal polysulfide, the proportion of polysulfide being equal at least to 30% by weight of the molar theoretical quantity, the average sulfur rank of polysulfide being more than 1 and up to and including 5, the pH of the reaction medium not exceeding 10.5 when the reaction is completed, and the obtained precipitate being separated from the reaction mother liquor, said precipitate being valuable organic polysulfide polymers containing 4-80% by weight of sulfur.
Inventors
- 👤 Fernand Peerts
- 👤 Yvon Delaunois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:13
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/14; C08G75/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
146 words
A process for abating a waste disposal problem in the manufacture of vinyl chloride wherein 1,2 dichlorethane is an intermediate and a heavy residue is recovered as still bottoms, from the purification by distillation of dichloroethane and/or vinyl chloride having an organic-origin chloride content ranging between 55 and 80% by weight, said process comprising reacting said heavy residue at 50° to 100° C., in aqueous medium with an alkali metal or an alkaline earth metal polysulfide, the proportion of polysulfide being equal at least to 30% by weight of the molar theoretical quantity, the average sulfur rank of polysulfide being more than 1 and up to and including 5, the pH of the reaction medium not exceeding 10.5 when the reaction is completed, and the obtained precipitate being separated from the reaction mother liquor, said precipitate being organic polysulfide polymers containing 4-80% by weight of sulfur.
Claim 2
Dependent Claim
146 words
A process for abating a waste disposal problem in the manufacture of vinyl chloride wherein 1,2 dichlorethane is an intermediate and a heavy residue is recovered as still bottoms, from the purification by distillation of dichloroethane and/or vinyl chloride having an organic-origin chloride content ranging between 55 and 80% by weight, said process comprising reacting said heavy residue at 50° to 100° C., in aqueous medium with an alkali metal or an alkaline earth metal polysulfide, the proportion of polysulfide being equal at least to 30% by weight of the molar theoretical quantity, the average sulfur rank of polysulfide being more than 1 and up to and including 5, the pH of the reaction medium not exceeding 10.5 when the reaction is completed, and the obtained precipitate being separated from the reaction mother liquor, said precipitate being organic polysulfide polymers containing 4-80% by weight of sulfur.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the alkali metal polysulfide is a sodium polysulfide obtained by reacting sodium sulfide with sulfur.
Claim 4
Dependent Claim
32 words
A process according to claim 1, wherein the heavy residue and the polysulfide are mixed at 50° to 80° C. and the reaction is terminated at a temperature of about 90°-100° C.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the reaction is achieved in the presence of a dispersing agent.
Claim 6
Dependent Claim
16 words
A process according to claim 4, wherein the dispersing agent is iron, aluminum or magnesium hydroxide.
Claim 7
Dependent Claim
19 words
A process according to claim 4, wherein the dispersing agent is magnesium hydroxide obtained in situ from magnesium chloride.
Claim 8
Dependent Claim
36 words
A process according to claim 1, wherein the precipitate is washed with water in order to separate the soluble impurities, slurried in water and coagulated by acidification of the reaction medium at a pH below 5.
Claim 9
Dependent Claim
33 words
A process according to claim 1, wherein the organic polysulfide polymers contain from 4 to 50% by weight of sulfur and the average rank is between 1 and up to and including 2.7.
Claim 10
Dependent Claim
30 words
A process according to claim 1, wherein the organic polysulfide polymers contain from 50 to 80% by weight of sulfur and the average sulfur rank is between 3.4 to 5.
Claim 11
Dependent Claim
7 words
Polysulfide polymer obtained according to claim 1.
Claim 12
Dependent Claim
7 words
Polysulfide polymer obtained according to claim 3.
Claim 13
Dependent Claim
7 words
Polysulfide polymer obtained according to claim 7.
Claim 14
Dependent Claim
7 words
Polysulfide polymer obtained according to claim 8.
Claim 15
Dependent Claim
7 words
Polysulfide polymer obtained according to claim 9.
Claim 16
Dependent Claim
21 words
A coating composition comprising the polysulfide polymer of claim 13 dispersed in a solvent in which said polysulfide polymer is miscible.
Claim 17
Dependent Claim
10 words
A coating composition according to claim 15, further comprising pigment.
References Cited (Backward Citations)
US2466963A
Cited
US3111545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |