Inhibition of polymerization during distillation of monomers.

摘要

Unintentional or premature polymerization of ethylenically unsaturated organic compounds during distillation for purification and recovery is inhibited by means of a liquid phase-vapor phase inhibitor system comprising a liquid phase inhibitor containing a phenolic inhibitor and a soluble manganese or cerium compound and a vapor phase inhibitor selected from the group of nitric oxide and N-phenyl-N-nitrosohydroxylamine ammonium salt.