Process for separating and recovering the constituents of an exh

Details Process for separating and recovering the constituents of an exh Process for separating and recovering the constituents of an exh

1976-12-16

1977-08-23

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

With disparate physical separation

Utilizing removing solid from liquid

203 79, 203 92, 203 95, 159 47R, 134 12, 134 13, 260561R, 260674A, 528484, 528500, B01D 336, B08B 308

Patent

active

040438740

ABSTRACT:
The constituents of an exhausted toluene-dimethylformamide solvent mixture used for removing polyvinyl chloride deposits from polymerization reactors, are separated by adding water to said mixture and distilling off toluene, thereby to obtain a distillation residue having a water content of at least 2 wt.% and a toluene content not exceeding 10 wt.%, precipitating the polymer by cooling the distillation residue, adding a further amount of water, distilling off any toluene present, recovering the precipitate and distilling the residual aqueous solution to recover the dimethylformamide.

REFERENCES:
patent: 2530144 (1950-11-01), Bannon
patent: 3352840 (1967-11-01), Oktay
patent: 3975230 (1976-08-01), Yang et al.
patent: 3997360 (1976-12-01), Testa et al.
patent: 3998655 (1976-12-01), Benetta et al.
patent: 4009048 (1977-02-01), Jensen et al.
patent: RE27432 (1972-07-01), Torrenzano et al.

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