Polymer solution purification

Details Polymer solution purification Polymer solution purification

1979-12-21

1981-07-14

Sever, Frank

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 91, 525366, 525382, 526340, 528501, B01D 336, B01D 340

Patent

active

042785065

ABSTRACT:
In preparing a solvent-polymer mixture for a subsequent reaction, e.g., metallation, wherein undesirable components lower boiling than the solvent, such as water, should be removed from the solvent and polymer, the undesirable components are removed by stripping using previously purified solvent, thereby preventing reboiler fouling. The stripping vapors are generated from solvent obtained from a source other than the fractionation column in which the stripping occurs in order to reduce costs. The process of this invention is particularly useful in removing water from a butadiene/styrene copolymer-cyclohexane solvent mixture prior to metallation of the copolymer.

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patent: 2943082 (1960-06-01), Cottle
patent: 3257372 (1966-06-01), Moon
patent: 3259555 (1966-07-01), Lankton et al.
patent: 3414482 (1968-12-01), Folz
patent: 3462347 (1969-08-01), Chapman et al.
patent: 3857759 (1974-12-01), Fiore
patent: 3978161 (1976-08-01), Nielsen et al.

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