Patent US3933989A successfully refreshed from Google Patents.
US3933989A
Expired / Lapsed
US
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Method for disposal of waste synthetic high polymer
Assignee: Kawasaki Motors Ltd
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Filing: 1974-01-11
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Granted: 1976-01-20
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Expires: 1994-01-11
Abstract
Abstract Waste synthetic high polymer, especially those containing polyvinyl chloride and the like chlorine-containing synthetic resins are heated at 200°-500°C to thereby form a hot molten bath of fusible materials contained in the waste resin mixture and the chlorine-containing resins are effectively decomposed in the molten bath kept at the temperature of 200°-500°C with the generation of hydrogen chloride gas which can be recovered as hydrochloric acid.
Inventors
- 👤 Hayami Itoh
- 👤 Mamoru Yamada
- 👤 Yasuo Nozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:47
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/12; C; C01; C01B; C01B7/00; C01B7/01; C10; C10B; C10B53/00; C10B53/07; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y02P20/143
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A method for the disposal treatment of a mixture of a relatively thermally stable waste synthetic high polymer which is fusible at temperatures below 500°C and a thermally unstable waste synthetic high polymer which includes chlorine containing materials, which comprises: a. providing a heating vessel; b. heating said waste synthetic high polymer in said vessel at a temperature of 200° to 500°C, thereby to melt said thermally stable portion thereof to form a hot molten bath in said vessel; and c. simultaneously with step (b) deomposing said thermally unstable portion of said waste synthetic high polymer to form hydrogen chloride and to form hydrocarbon gas and removing said hydrogen chloride and hydrocarbon gas from said vessel; d. separating the removed hydrogen chloride from the hydrocarbon gas and burning at least a portion of said hydrocarbon gas as fuel for heating said waste synthetic high polymer in step (b); and e. after substantially all the chlorine has been removed from said waste synthetic high polymer, disposing of said hot molten bath.
Claim 2
Independent Claim
170 words
A method for the disposal treatment of a mixture of a relatively thermally stable waste synthetic high polymer which is fusible at temperatures below 500°C and a thermally unstable waste synthetic high polymer which includes chlorine containing materials, which comprises: a. providing a heating vessel; b. heating said waste synthetic high polymer in said vessel at a temperature of 200° to 500°C, thereby to melt said thermally stable portion thereof to form a hot molten bath in said vessel; and c. simultaneously with step (b) deomposing said thermally unstable portion of said waste synthetic high polymer to form hydrogen chloride and to form hydrocarbon gas and removing said hydrogen chloride and hydrocarbon gas from said vessel; d. separating the removed hydrogen chloride from the hydrocarbon gas and burning at least a portion of said hydrocarbon gas as fuel for heating said waste synthetic high polymer in step (b); and e. after substantially all the chlorine has been removed from said waste synthetic high polymer, disposing of said hot molten bath.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said disposal is conducted on a continuous basis.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein hydrogen chloride generated by the thermal decomposition of said chlorine-containing materials is recovered as hydrochloric acid.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein the disposing of said hot molten bath containing said decomposed waste synthetic high polymer is by spray burning.
Claim 6
Dependent Claim
32 words
The method of claim 1 wherein at least a portion of said hot molten bath containing said decomposed waste synthetic high polymer is burned as fuel for heating said hot molten bath.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein the disposing of said hot molten bath containing said decomposed waste synthetic high polymer is by casting and molding the decomposed resin therein.
References Cited (Backward Citations)
JPS4732509U
Cited
US3829558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |