Method of recovering pure toluene diisocyanate from a polymeric

Details Method of recovering pure toluene diisocyanate from a polymeric Method of recovering pure toluene diisocyanate from a polymeric

1976-12-15

1983-02-08

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C119048

Patent

active

043728910

ABSTRACT:
Polymeric residue including toluene diisocyanate is combined with a solvent having a low affinity for polymer solution and a high affinity for toluene diisocyanate to dissolve toluene diisocyanate leaving the polymeric materials in suspension. The polymeric compounds are precipitated and filtered, the filtrate solution distilled and the toluene diisocyanate recovered as a pure product.

REFERENCES:
patent: 3144474 (1964-08-01), Kantyka et al.
patent: 3211631 (1965-10-01), Fuchs
patent: 3479384 (1969-11-01), Heiss

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