Cryogenic brine separation of water and isocyanates

Details Cryogenic brine separation of water and isocyanates Cryogenic brine separation of water and isocyanates

1985-11-14

1986-07-29

Siegel, Alan

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

Organic compounds

Isocyanate esters

560338, C07C 7100

Patent

active

046030166

ABSTRACT:
Isocyanates produced by vapor-phase catalytic oxidative dehydrogenation of corresponding N-substituted formamides are readily separated from by-product water by contacting the reaction mixture, in the vapor phase, with a cold brine mixture comprising water and about 25% to about 35% by weight of a salt or salts selected from the group consisting of NaCl, CaCl.sub.2, and MgCl.sub.2, the brine mixture having been maintained at a temperature between about 0.degree. C. and its freezing point prior to contact with the reaction mixture containing isocyanates.

REFERENCES:
patent: 4207251 (1980-06-01), Heyboer

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