Solvent cleaning and recovery process

Details Solvent cleaning and recovery process Solvent cleaning and recovery process

1975-07-11

1977-02-22

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 13, 134 22R, 134 38, 203 47, 203 48, 210 42R, B08B 308, B08B 310

Patent

active

040090485

ABSTRACT:
Vinyl halide polymers are removed from the internal surfaces of reaction equipment with a solvent and the solvent recovered by: (1) contacting the polymer-containing solvent with steam forming a slurry; (2) cooling the slurry to form a crumbly precipitate; (3) separating the resulting slurry into an aqueous solvent and a precipitate; (4) adding water to the precipitate to form a second slurry; and (5) separating the second slurry into a second aqueous solvent solution and vinyl halide polymers. The aqueous solvent solutions are dehydrated before being reused in solvent cleaning.

REFERENCES:
patent: 2389958 (1945-11-01), Crawford et al.
patent: 3764384 (1973-10-01), Berni
patent: 3862103 (1975-01-01), Campbell et al.
patent: R27432 (1972-07-01), Torrenzano et al.

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