Process for removing the solvent from an elastomeric polymer sol

Details Process for removing the solvent from an elastomeric polymer sol Process for removing the solvent from an elastomeric polymer sol

1993-06-14

1994-02-01

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

159 3, 159 481, 159DIG10, 264 13, 264349, 26421123, 366 75, 366 76, 425203, 425204, 425205, B29B 1308, B29C 4776

Patent

active

052830217

ABSTRACT:
The process is used to remove the solvent from an elastomeric polymer solution containing at least 8% by weight of elastomeric polymer. The elastomeric polymer solution undergoes a preprocessing step in order to remove a large part of the solvent. Thereafter, the elastomeric polymer solution is fed into a main extruder in order to remove the remaining solvent. The preprocessing step includes: (a) introducing a heating fluid and the elastomeric polymer solution into a static mixer in order to mix the heating fluid and the elastomeric polymer solution and heat rapidly the elastomeric polymer solution to a temperature of 60.degree.-250.degree. C.; (b) spraying the mixture of heating fluid and elastomeric polymer solution under a depressurization atmosphere in order to vaporize the heating fluid and solvent out of the mixture and form a vaporized heating fluid, a vaporized solvent and a powdered elastomeric polymer; (c) introducing the vaporized heating fluid, the vaporized solvent and the powdered elastomeric polymer into a fluid-solid separation chamber; and (d) extruding the powdered elastomeric polymer into the main extruder via a polymer outlet of the fluid-solid separation chamber while removing the vaporized heating fluid and solvent via a vapor outlet of the fluid-solid separation chamber.

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