Process for the continuous production of organic isocyanates

Details Process for the continuous production of organic isocyanates Process for the continuous production of organic isocyanates

C - Chemistry, Metallurgy

07

C

260/455

C07C 119/042 (1980.01)

Patent

CA 1088091

ABSTRACT OF THE DISCLOSURE: The invention is concerned with an improved process for the continuous manufacture or an organic isocyanate from an organic amine and phosgene in the presence of an organic solvent, wherein the organic isocyanate, organic amine, phosgene and organic solvent are conducted into a reaction chamber to form a reaction solution and a portion of the reaction solution is recycled. In accordance with the invention, phosgene is mixed with the recycled portion of the reaction solution, and 5 to 100% of the phosgene- containing recycled portion of the reaction solution is fed to a nozzle, the exit of the nozzle extending below the surface of the reaction solution contained in the reaction chamber. The phosgene-containing recycled portion of the reaction solution is accelerated through the nozzle such that the recycled reaction solution issues from the nozzle as a drive jet having a velocity of from 1 to 40 m/sec thereby forming a mixing and reaction zone within the reaction chamber, while organic amine or amine solution is simultaneously fed at a velocity of from 0.3 to 30m/sec to the drive jet of the recycled phosgene-containing reaction solution in the mixing and reaction zone, so that the volume ratio of the total amount of phosgene-containing recycled reaction solution to the amount of organic amine or amine solution is from 300:1 to 1:1, whereby an energy dissipation density of from 5 to 1000 kJoule per m3 of phosgene-containing reaction solution plus amine feedis generated in the mixing and reaction zone. The process of the invention allows to virtually completely suppress the formation of by-products and to obtain high yields of iso- cyanate and end products of high purity.

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