US4208530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of atactic polymers
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1978-12-26
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Granted: 1980-06-17
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Expires: 1998-12-26
Abstract
Abstract In a process for the recovery of an atactic polymer which comprises heating liquid propylene containing the dissolved atactic polymer at a gauge pressure of 13 to 40 kg/cm2 in a vaporizer to vaporize the propylene, and separating the atactic polymer from the vaporized propylene thereby recovering the polymer in a molten state, the improvement comprising maintaining the vaporization temperature of propylene at 45 DEG C. to 90 DEG C. and the temperature of a heating medium for the vaporizer at 60 DEG C. to 150 DEG C. According to this process, a long run can be used in the recovery of the atactic polymer.
Inventors
- 👤 Kiyoshi Matsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:24
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/06; C08F6/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
In a process for the recovery of an atactic polymer which comprises heating liquid propylene containing the dissolved atactic polymer at a gauge pressure of 13 to 40 kg/cm 2 in a vaporizer to vaporize the propylene, and separating the atactic polymer from the vaporized propylene thereby recovering the polymer in a molten state, the improvement comprising maintaining the vaporization temperature of propylene at about 45° C. to 90° C. and the temperature of a heating medium for the vaporizer at about 60° C. to 150° C.
Claim 2
Dependent Claim
87 words
In a process for the recovery of an atactic polymer which comprises heating liquid propylene containing the dissolved atactic polymer at a gauge pressure of 13 to 40 kg/cm 2 in a vaporizer to vaporize the propylene, and separating the atactic polymer from the vaporized propylene thereby recovering the polymer in a molten state, the improvement comprising maintaining the vaporization temperature of propylene at about 45° C. to 90° C. and the temperature of a heating medium for the vaporizer at about 60° C. to 150° C.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein said vaporizer has a tubular structure and is equipped with a heating jacket.
Claim 4
Dependent Claim
17 words
The process of claim 2, wherein the vaporizer is a single pipe surrounded by a heating jacket.
Claim 5
Dependent Claim
23 words
The process of claim 2, wherein the vaporizer is of a vertical construction composed of two or more pipes in a heating jacket.
Claim 6
Dependent Claim
52 words
The process of claim 1, wherein the feed rate to the vaporizer of said liquid propylene solution is increased to 1.1 times or more the mean feed flow of the propylene solution, for a duration of from 0.5 to 5 seconds at intervals of 5 minutes to 12 hours during the separation.
Claim 7
Dependent Claim
29 words
The process of claim 5, wherein said solution feed rate is increased at intervals regulated depending upon the rate at which the heat transfer coefficient of the vaporizer drops.
Claim 8
Dependent Claim
18 words
The process of claim 5, wherein said solution feed to the vaporizer is stopped prior to said increase.
Claim 9
Dependent Claim
35 words
The process of claim 1 or 5, wherein said liquid propylene is supplied to the vaporizer together with a solvent in an amount of 1 to 20% by weight based on the liquid propylene solution.
Claim 10
Dependent Claim
26 words
The process of claim 8, wherein said solvent is a hydrocarbon having 4 or more carbon atoms, an alcohol, an alkylene oxide or a mixture thereof.
Claim 11
Dependent Claim
30 words
The process of claim 1, wherein said vaporization temperature is about 55° C. to 75° C. and the temperature of said heating medium is about 100° C. to 120° C.
Claim 12
Dependent Claim
33 words
The process of claim 5, wherein said increased feed rate to the vaporizer of said liquid propylene solution is 1.1 to 10 times based on the mean feed flow of the propylene solution.
Claim 13
Dependent Claim
33 words
The process of claim 11, wherein said increased feed rate to the vaporizer of said liquid propylene solution is 1.3 to 3 times based on the mean feed flow of the propylene solution.
References Cited (Backward Citations)
US3644583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |