Process for the production of polyisocyanates

Details Process for the production of polyisocyanates Process for the production of polyisocyanates

1992-11-06

1994-02-08

Dees, Jose' G.

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

Organic compounds

Isocyanate esters

203 28, 203 60, 203 69, 560352, C07C26304

Patent

active

052849694

ABSTRACT:
A process for the continuous catalyst-free production of polyisocyanates by thermal decomposition of the N-substituted carbamic acid esters corresponding to the polyisocyanates, in which the carbamic acid esters to be decomposed, in the form of a 5 to 90% by weight solution in an inert high-boiling solvent, are heated to a temperature of 100.degree. to 400.degree. C. and are subsequently introduced with expansion as a sidestream into a distillation column (4), in the sump of which a pressure of 0.001 to 5 bar and a temperature of 150.degree. to 400.degree. C. are maintained so that the high boiler is kept boiling in the sump, and the decomposition products are simultaneously condensed continuously and selectively at the head of the distillation column. The high boiler, which optionally contains impurities, is continuously removed via the sump outlet in a quantity substantially corresponding to the quantity of high boiler introduced into the column as solvent for the carbamic acid ester.

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