Multistage continuous preparation of (cyclo) aliphatic...

Details Multistage continuous preparation of (cyclo) aliphatic... Multistage continuous preparation of (cyclo) aliphatic...

C - Chemistry, Metallurgy

07

C

C07C 263/06 (2006.01) C07C 265/14 (2006.01)

Patent

CA 2478300

Disclosed is a multistage process for continuous and phosgene-free preparation of (cyclo)aliphatic diisocyanates. The process comprises: (A) reacting (i) a (cyclo)aliphatic diamine with (ii) urea or a urea derivative and (iii) an alcohol to give a (cyclo)aliphatic diurethane and by-products comprising low-boiling, middle-boiling and high-boiling fractions; (B) freeing the (cyclo)aliphatic diurethane of the low-, and middle-boiling fractions; (C) thermally cleaving the (cyclo)aliphatic diurethane to give the (cyclo)aliphatic diisocyanate and a cleavage residue in a cleavage apparatus; (D) continuously discharging a portion of the cleavage residue from the cleavage apparatus and removing the high-boiling fractions from the portion of the cleavage residue; and (E) re-urethanizing the portion of the cleavage residue with the alcohol to form the cycloaliphatic diurethane, and reintroducing the cycloaliphatic diurethane into step (B). According to the process, deposits due to the high boiler components by- products can be avoided and a high yield can be ensured.

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