US3941664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for diluent removal from poly(arylene sulfide) reactor product
Assignee: Phillips Petroleum Co
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Filing: 1972-08-29
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Granted: 1976-03-02
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Expires: 1992-08-29
Abstract
Abstract A method for control of the steam flashing of poly(arylene sulfide) reaction product to remove substantially all of the reaction diluent from a reaction mixture containing poly(arylene sulfide) polymer, organic polar diluent, byproduct alkali metal halide, and reaction mixture impurities is provided by measuring the vapor effluent from the flashing operation, producing a signal representative of this flow, controlling the rate of flow of the effluent from the reactor in response to this signal, and controlling the rate of flow of steam admixed with the reactor effluent in ratio to the effluent flow.
Inventors
- 👤 Jack S. Scoggin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:06
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
In a process for recovering polar organic diluent from reactor effluent slurry comprising poly(arylene sulfide), polar organic diluent, alkali metal halide, and reaction impurities, by mixing the reactor effluent with steam and reducing the pressure to flash the mixture, with a method for control, the improvement comprising: 1. generating a signal characteristic of the flow rate of flashed vapor from the flashing operation; 2. controlling the rate of flow of effluent from the reactor in response to said signal; and 3. controlling the rate of flow of steam admixed with the reactor effluent in predetermined ratio to the flow of flashed vapor in response to said signal.
Claim 2
Dependent Claim
107 words
In a process for recovering polar organic diluent from reactor effluent slurry comprising poly(arylene sulfide), polar organic diluent, alkali metal halide, and reaction impurities, by mixing the reactor effluent with steam and reducing the pressure to flash the mixture, with a method for control, the improvement comprising: 1. generating a signal characteristic of the flow rate of flashed vapor from the flashing operation; 2. controlling the rate of flow of effluent from the reactor in response to said signal; and 3. controlling the rate of flow of steam admixed with the reactor effluent in predetermined ratio to the flow of flashed vapor in response to said signal.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein entrained solids particles are removed from the flashed vapor upstream of the flashed vapor flow determination.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein polar organic diluent is N-methylpyrrolidone.
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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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |