A method for the production of chlorosulfonyl isocyanate

摘要

A method for producing chlorosulfonyl isocyanate wherein chlorocyanogen is reacted with sulfur trioxide to form chlorosulfonyl isocyanate, characterized in that chlorosulfonyl isocyanate or a fluid containing chlorosulfonyl isocyanate is used as a solvent for the reaction, and approximately equimolar amounts of sulfur trioxide and chlorocyanogen, which are respectively diluted with chlorosulfonyl isocyanate or a fluid containing chlorosulfonyl isocyanate, are simultaneously fed under reflux to a reaction system. The above method can be employed for producing chlorosulfonyl isocyanate having a high purity from sulfur trioxide and chlorocyanogen, in a high yield, with good operability, while achieving savings in the equipment and in the effort for temperature control.