Process for separating technically pure 2,4-diisocyanatotoluene

Details Process for separating technically pure 2,4-diisocyanatotoluene Process for separating technically pure 2,4-diisocyanatotoluene

1983-05-12

1985-02-12

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 7100

Patent

active

044990235

ABSTRACT:
Technically pure 2,4-diisocyanatotoluene or an isomer mixture having an increased 2,4-diisocyanatotoluene content is obtained from an isomer mixture of 2,4- and 2,6-diisocyanatotoluene. The 2,4- and 2,6-diisocyanatotoluene mixture is first cooled to a temperature of from 4.degree. to 9.degree. C. and further cooled to between -2.degree. to -6.degree. C. at a rate of 0.5.degree. to 3.degree. C. per hour. The temperature of the mixture is maintained at that temperature for at least 30 minutes. Any liquid present is removed and the solid remaining is then melted. Melting is preferably carried out by heating the solid at a rate of 0.5.degree. to 3.degree. C. per hour until the remaining solid has a 2,4-diisocyanatotoluene content of at least 98%. The liquid melt is removed and the solid having the desired 2,4-diisocyanatotoluene content is then melted.

REFERENCES:
patent: 3217024 (1965-11-01), Park et al.
patent: 4246187 (1981-01-01), Yabroff

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