Method for cleansing vinyl chloride polymerization reactors

Details Method for cleansing vinyl chloride polymerization reactors Method for cleansing vinyl chloride polymerization reactors

1975-07-23

1976-12-21

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 13, 134 22R, 134 38, 203 47, B08B 704

Patent

active

039986551

ABSTRACT:
Incrustations of vinyl chloride polymers and copolymers are removed from the polymerization reactors by dissolving said incrustations at a temperature above 60.degree. C in a solvent chosen from the substituted amides up to a polymeric compound content in the resulting solution not exceeding 7% by weight, concentrating the resulting solution to a 10-30 wt. % polymeric compound content by evaporating a mixture of solvent and water, extruding the concentrated solution into an aqueous coagulating bath and recovering the spun product. The solvent is recovered by fractional distillation of the vaporized mixture and of the solvent-enriched coagulating bath.

REFERENCES:
patent: 3740267 (1973-06-01), Haylock
patent: 3764384 (1973-10-01), Berni
patent: 3879506 (1975-04-01), Melacini et al.

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