Patent US3839302A successfully refreshed from Google Patents.
US3839302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of poly(arylene sulfide) reaction product
Assignee: Phillips Petroleum Co
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Filing: 1973-10-01
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Granted: 1974-10-01
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Expires: 1993-10-01
Abstract
Abstract A method is provided for improving the color and other properties of recovered poly(arylene sulfide) by steam treating a reaction slurry of poly(arylene sulfide) solid polymer particles, an organic amide, and by-product alkali metal halide with steam after concentration of the reaction slurry.
Inventors
- 👤 J Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:11
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0277; C08G75/0281; C08G75/0209; C08G75/0213; C08G75/025; C08G75/0254
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A METHOD FOR TREATING A POLY(ARYLENE SULFIDE) REACTION PRODUCT SAID METHOD COMPRISING: A. PRODUCING A REACTION SLURRY COMPRISING POLY(ARYLENE SULFIDE), AN ORGANIC AMIDE, AND ALKALI METAL HALIDE; B. PRODUCING A CONCENTRATED SLURRY AT A CONCENTRATION IN THE RANGE OF ABOUT 0.45 TO ABOUT 0.55 MOL POLYMER REPEATINF UNIT PER MOL ORGANIC AMIDE BY EVAPORATION OF SAID REACTION SLURRY AT REDUCED PRESSURE; C. INCREASING THE PRESSURE ON SAID CONCENTRATED SLURRY TO ABOUT 140 TO ABOUT 160 PSIG USING STEAM; D. HEATING SAID CONCENTRATED SLURRY TO A TEMPERATURE IN THE RANGE OF UP TO AT LEAST THE ORIGINAL REACTION SLURRY TEMPERATURE; E. REDUCING THE PRESSURE ON SAID CONCENTRATED SLURRY IN ADIABATIC EXPANSION; AND F. RECOVERING THE POLY(ARYLENE SULFIDE) REACTION PRODUCT.
Claim 2
Independent Claim
118 words
A METHOD FOR TREATING A POLY(ARYLENE SULFIDE) REACTION PRODUCT SAID METHOD COMPRISING: A. PRODUCING A REACTION SLURRY COMPRISING POLY(ARYLENE SULFIDE), AN ORGANIC AMIDE, AND ALKALI METAL HALIDE; B. PRODUCING A CONCENTRATED SLURRY AT A CONCENTRATION IN THE RANGE OF ABOUT 0.45 TO ABOUT 0.55 MOL POLYMER REPEATINF UNIT PER MOL ORGANIC AMIDE BY EVAPORATION OF SAID REACTION SLURRY AT REDUCED PRESSURE; C. INCREASING THE PRESSURE ON SAID CONCENTRATED SLURRY TO ABOUT 140 TO ABOUT 160 PSIG USING STEAM; D. HEATING SAID CONCENTRATED SLURRY TO A TEMPERATURE IN THE RANGE OF UP TO AT LEAST THE ORIGINAL REACTION SLURRY TEMPERATURE; E. REDUCING THE PRESSURE ON SAID CONCENTRATED SLURRY IN ADIABATIC EXPANSION; AND F. RECOVERING THE POLY(ARYLENE SULFIDE) REACTION PRODUCT.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said organic amide is N-methyl pyrrolidone and said alkali metal halide is sodium chloride.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said steam pressured concentrated slurry is heated to a temperature in the range of 500* to about 625*F.
Claim 5
Dependent Claim
26 words
A method wherein the pressure on the heated concentrated slurry of claim 3 is reduced to about atmospheric and the poly(arylene sulfide) reaction product is recovered.
Claim 6
Dependent Claim
37 words
A method of claim 4 wherein said heated concentrated slurry is transferred from one vessel at said pressure of about 140 to about 160 psig to another vessel at a reduced pressure to accomplish the adiabatic expansion.
Claim 7
Dependent Claim
57 words
A method of claim 5 wherein the concentration of said concentrated slurry is about 0.47 mols poly(arylene sulfide) repeating unit per mol organic amide, the pressure on the concentrated slurry is increased to about 150 psig using steam, the temperature of the slurry is then increased to about 540*F and the pressure is then reduced to atmospheric.
References Cited (Backward Citations)
US3707528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |