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

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

B - Operations, Transporting

01

D

260/496.1

B01D 9/02 (2006.01)

Patent

CA 1140583

ABSTRACT OF THE DISCLOSURE 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.

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