Patent ID: 9533885
Date: 2017-01-03
CPC Classifications: B01D,C01B,C07C,Y02P

Claim:
1. A process for the conversion of an amine to a corresponding isocyanate component by phosgenation of said amine, the process comprising the steps of providing a reaction mixture comprising an amine and phosgene to a phosgenation reactor; at least partially converting the amine and the phosgene in said reaction mixture into the corresponding isocyanate component and hydrogen chloride, thereby providing a liquid isocyanate stream comprising said isocyanate component, phosgene and hydrogen chloride; removing at least part of said phosgene and at least part of said hydrogen chloride from said liquid isocyanate stream thereby providing an initial gaseous stream comprising phosgene and hydrogen chloride; evacuating at least part of the hydrogen chloride from said initial gaseous stream, said evacuation comprises a process comprising feeding said initial gaseous stream to a membrane separation unit having a retentate side and a permeate side, said membrane separation unit separating said initial gaseous stream into a first and a second gaseous stream.