Process for the preparation of toluene-diisocyanate

Details Process for the preparation of toluene-diisocyanate Process for the preparation of toluene-diisocyanate

2010-09-30

2011-11-22

Parsa, Jafar (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C560S352000

Reexamination Certificate

active

08063241

ABSTRACT:
The present invention relates to a process for the preparation of toluene-diisocyanate. In this process, toluenediamine is reacted with phosgene to give crude toluene-diisocyanate, the crude toluene-diisocyanate is purified by distillation, the distillation residue formed during the distillation is hydrolysed at temperatures of less than 230° C. under absolute pressures of less than 30 bar, and the toluenediamine formed by this process is subsequently recycled into the reaction of toluenediamine and phosgene.

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