Process for cleaning vinyl chloride polymerization reactors

Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment

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134 38, 252153, 252364, 252544, B08B 308

Patent

active

039973603

ABSTRACT:
Polymeric deposits formed on internal surfaces of the reactors during polymerization or copolymerization of vinyl chloride are removed by dissolving them at a temperature above 60.degree. C with a solvent mixture comprising from 0 to 7% by weight of water, the remainder consisting of toluene and dimethylformamide in a weight ratio of toluene to dimethylformamide of from 50:50 to 90:10.

REFERENCES:
patent: 3764384 (1973-10-01), Berni
patent: 3784477 (1974-01-01), Esposito
Journal of Polymer Science, "Effects of Solvent Structure in Polyvinyl Chloride-Solvent Systems", vol. 31, 1958, pp. 77, 79, 80, 83-85, 88.

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