Flash evaporation process for concentrating polymer solutions

Details Flash evaporation process for concentrating polymer solutions Flash evaporation process for concentrating polymer solutions

1980-11-19

1983-11-08

Lieberman, Allan

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

106198, 524924, 528501, C08J 300, C08L 6700

Patent

active

044143419

ABSTRACT:
A continuous process for concentrating polymer solutions, particularly solutions of halogenated aromatic polyesters in methylene chloride, is provided. The polymer solutions, are first passed through a heating zone where they are heated to a temperature of not less than the temperature at which the solvent thereof evaporates. The heated solution is then passed through an orifice or a multiplicity of orifices (such as a spinneret) located in an evaporation chamber containing a saturated atmosphere of solvent vapor which is maintained within specifically defined temperature limits where flash evaporation of the solvent takes place in the absence of the formation of polymer gels or skins. The polymer solutions are concentrated to a final concentration higher than the initial polymer solution concentration.

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patent: 3453184 (1969-07-01), Gemassmer et al.
patent: 3493470 (1970-02-01), Irvin
patent: 3634300 (1972-01-01), Fischer et al.
patent: 3635917 (1972-01-01), Roth et al.
patent: 3668161 (1972-06-01), Nauman et al.
patent: 4255314 (1981-03-01), Miyoshi et al.

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