Claims
- 1. A flash-drying process for removing a solvent from a liquid solution comprising a solvent and an elastomeric polymer or copolymer dissolved in said solvent and said solution having a viscosity of about 10 to about 10,000 centipoises maintained at an elevated temperature and pressure, which comprises flashing said solution into a flashing zone via a pipeline, said flashing zone being provided in connection to the end of said pipeline and being maintained at a lower pressure than the pressure of the solvent solution through a means for releasing said elevated pressure, and feeding an inert stripping agent into the solution at any point between said pressure-releasing means and said flashing zone, thereby evaporating and separating the solvent from the solution.
- 2. The process of claim 1 wherein the inert stripping agent is a member selected from the group consisting of water, steam, nitrogen gas, carbon dioxide gas, hydrocarbons having 1 to 4 carbon atoms and mixtures of at least two of these.
- 3. The process of claim 1 wherein the elastomeric polymer or copolymer is a polymer or copolymer selected from the group consisting of an ethylene/alpha-olefin copolymer rubber, an ethylene/alpha-olefin/diene copolymer rubber, a propylene/alpha-olefin copolymer rubber and diene rubbers.
- 4. The process of claim 1 wherein the amount of the inert stripping agent fed is about 5 mole% to about 300 mole% based on the total amount of the solvent in the solution.
- 5. The process of claim 1 wherein the solution is maintained at a temperature of about 100.degree. to about 250.degree. C. and a pressure of about 3 to about 40 kg/cm.sup.2.G.
Priority Claims (1)
Number |
Date |
Country |
Kind |
54-130162 |
Oct 1979 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 831,121 filed Feb. 21, 1986, which in turn is a continuation of application Ser. No. 521,450 filed Sept. 8, 1983, which in turn is a continuation of application Ser. No. 369,824 filed Apr. 18, 1982, which in turn is a continuation of application Ser. No. 194,917 filed Oct. 7, 1980, all of which are now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1587989 |
Apr 1981 |
GBX |
1590532 |
Jun 1981 |
GBX |
Continuations (4)
|
Number |
Date |
Country |
Parent |
831121 |
Feb 1986 |
|
Parent |
521450 |
Sep 1983 |
|
Parent |
369824 |
Apr 1982 |
|
Parent |
194917 |
Oct 1980 |
|