Preparation of hexamethylene 1,6-diisocyanate and/or...

Details Preparation of hexamethylene 1,6-diisocyanate and/or... Preparation of hexamethylene 1,6-diisocyanate and/or...

C - Chemistry, Metallurgy

08

G

260/456.5

C08G 18/73 (2006.01)

Patent

CA 1225998

ABSTRACT OF THE DISCLOSURE: Hexamethylene 1,6-diiso- cyanate and/or isomeric aliphatic diisocyanates where alkylene is of 6 carbon atoms, preferably 2-methylpenta- methylene 1,5-diisocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate, are prepared by a process wherein the corresponding dialkylurethanes are vaporized, without decomposition, at from 220 to 300°C, advantageously under reduced pressure, the dialkylurethane vapors are subjec- ted to thermal cleavage under reduced pressure, prefer- ably from 0.1 to 200 mbar, and at above 300°C, preferably from 310 to 480°C, in particular in the presence of a hydrogen halide and/or a donor which forms hydrogen halide under the reaction conditions, so that the hydro- gen halide concentration during cleavage is from 0.001 to 1.0 mole %, based on the dialkylurethanes, and the cleavage products are fractionally condensed. The pro- duct obtained in the 1st condensation stage consists predominantly of the diisocyanates, while that obtained in the 2nd condensation stage is the alcohol.

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