B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
260/455
B01D 3/00 (2006.01)
Patent
CA 1048523
RECOVERY OF SOLVENTS EMPLOYED IN THE PRODUCTION OF ISOCYANATES FROM ESTERS OF CARBAMiC ACIDS (URETHANES) ABSTRACT OF THE DISCLOSURE In the method for the production of isocyanates from esters of carbamic acids (urethanes) by thermally decomposing said ester while said ester is dissolved in a suitable inert reaction medium solvent to produce the isocyanate and alcohol and removing the isocyanate and alcohol and a carrier agent and separately recovering the isocyanate, alcohol and carrier, the improvement which comprises recovering said reaction medium solvent together with any isocyanate and urethane values con- tained therein by stripping said solvent and the isocyanate/urethane values from the reactor bottoms away from any heavy by-product residues present in the reactor bottoms effluent. Inert stripping solvents or inert gases or mixtures of gas and solvent are used as the stripping medium and include the solvents, gases or mixtures thereof employed as carrier agents and are preferably the same recovered carrier agents employed during the thermal de- composition reaction. 1.
227192
O'toole James T.
Rosenthal Rudolph
Zajacek John G.
Atlantic Richfield Company
Na
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