Separation of 2,4-tolylene diisocyanate from mixtures of 2,4- an

Details Separation of 2,4-tolylene diisocyanate from mixtures of 2,4- an Separation of 2,4-tolylene diisocyanate from mixtures of 2,4- an

1979-07-17

1981-01-20

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C119048

Patent

active

042461871

ABSTRACT:
Separation of 2,4-tolylene diisocyanate from a mixture of 2,4- and 2,6-tolylene diisocyanate by cooling the mixture of isocyanate by passage through a heat exchanger to crystallize a portion of 2,4-tolylene diisocyanate to form a slurry containing no more than about 25% by weight 2,4-tolylene diisocyanate crystals suspended in mother liquor, maintaining the resulting slurry for a nominal residence time of at least about 2 hours at about a constant temperature and centrifuging the slurry to separate 2,4-tolylene diisocyanate crystals from the mother liquor.

REFERENCES:
patent: 3217024 (1965-11-01), Park et al.
patent: 3591617 (1971-07-01), Buchsbaum

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