Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1975-08-11
1976-12-14
Bashore, S. Leon
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
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.
Bigliani Antonio
Testa Francesco
Bashore S. Leon
Caroff Marc L.
Societa Italiana Resine S.I.R. S.p.A.
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