US4407989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation treatment of polymer from polymer solution
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1982-02-16
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Granted: 1983-10-04
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Expires: 2002-02-16
Abstract
Abstract A process for the separation treatment of a polymer solution characterized by, in separating and recovering polymer and polymerization solvent by flashing a polymer solution, heating said polymer solution under an elevated pressure sufficient to maintain said solution in a liquid phase, sending said solution into a flashing tank kept at an inner surface temperature of 140 DEG C. or above and a pressure ranging from ordinary pressure to 5 kg/cm2 G, flashing said solution to evaporate and separate the solvent, thereby concentrating said solution so that concentration of the polymer in said solution becomes 80% by weight or more, and recovering the concentrated solution from the bottom part of the flashing tank.
Inventors
- 👤 Hiroyoshi Takao
- 👤 Yoshio Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:04
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
In a process for the separation treatment of a polymer solution, the improvement in separating and recovering polymer and polymerization solvent by flashing a polymer solution, which comprises heating said polymer solution under an elevated pressure sufficient to maintain said solution in a liquid state, sending said solution into a flashing tank kept at an inner surface temperature of 140° C. or above and a pressure ranging from ordinary pressure to 5 kg/cm 2 G, flashing said solution to evaporate and separate the solvent, thereby concentrating said solution so that concentration of the polymer in said solution becomes 80% by weight or more, and recovering the concentrated solution from the bottom part of the flashing tank.
Claim 2
Dependent Claim
116 words
In a process for the separation treatment of a polymer solution, the improvement in separating and recovering polymer and polymerization solvent by flashing a polymer solution, which comprises heating said polymer solution under an elevated pressure sufficient to maintain said solution in a liquid state, sending said solution into a flashing tank kept at an inner surface temperature of 140° C. or above and a pressure ranging from ordinary pressure to 5 kg/cm 2 G, flashing said solution to evaporate and separate the solvent, thereby concentrating said solution so that concentration of the polymer in said solution becomes 80% by weight or more, and recovering the concentrated solution from the bottom part of the flashing tank.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the temperature of inner surface of the tank is 180° C. or above.
Claim 4
Dependent Claim
24 words
A process according to claim 1 or claim 2, wherein the concentration of polymer in the concentrated solution is 90% by weight or more.
Claim 5
Dependent Claim
58 words
A process according to claim 1, wherein the temperature of inner surface of flashed product duct, which is a duct for supplying the polymer and solvent vapor after flashing into the flashing tank, is maintained at 140° C. or above by providing a heating jacket on the outside of the flashed product duct or by some other means.
Claim 6
Dependent Claim
22 words
A process according to claim 4, wherein the temperature of inner surface of the flashed product duct is 180° C. or above.
Claim 7
Dependent Claim
44 words
A process according to claim 4, wherein said flashed product duct is so shaped that it is inserted into the flashing tank through the side wall of the flashing tank and bent towards the bottom of the flashing tank with a radius of curvature.
Claim 8
Dependent Claim
39 words
A process according to claim 6, wherein said radius of curvature with which flashed product duct is bent in the flashing tank is in the range of 1/8 to 6/8 based on the inner diameter of the flashing tank.
Claim 9
Dependent Claim
30 words
A process according to claim 4, wherein the velocity of solvent vapor at the tip of the flashed product duct is in the range of 0.5 m/sec to 6 m/sec.
Claim 10
Dependent Claim
31 words
A process according to claim 4, wherein the velocity of solvent vapor at the tip of the flashed product duct is not smaller than 0.5 m/sec and smaller than 1 m/sec.
Claim 11
Dependent Claim
29 words
A process according to any one of claims 1 to 3, wherein the polymer in said polymer solution is an ethylene-α-olefin binary copolymer or an ethylene-α-olefin-nonconjugated polyene ternary copolymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |