METHOD AND APPARATUS FOR REMOVING UNREACTED MONOMER

摘要

PROBLEM TO BE SOLVED: To efficiently recover unreacted vinyl chloride-based monomer without impairing the quality and productivity of a polymer and to obtain a high quality vinyl chloride-based paste resin sparingly including coarse agglomerate. SOLUTION: When performing steam stripping with a multistage column, at least two foam separators 6 are installed in parallel in a gas discharge line 7 joining the overhead of the column with a vacuum pump and continuous operation is performed by mutually switching the separators.