Recovery device and recovery method of unreacted monomer in vinyl chloride polymerization device

摘要

The reactor is charged with a vinyl chloride monomer or a mixture of vinyl chloride monomer with other monomers copolymerizable with vinyl chloride monomer, polymerized vinyl chloride monomer and then the vinyl chloride polymer with unreacted monomer remaining in the reactor. A recovery method is disclosed that includes recovering the contents of a reactor containing a into a blowdown tank. The pressure of the blowdown tank is kept below 1 kg / cm 2 G and unreacted monomer is recovered from the blowdown tank to the gas holder. An apparatus using this recovery method is also described. Since the time required for the recovery operation of the unreacted monomer can be significantly shortened, not only the time required for the polymerization step but also an increase in productivity are brought about. In addition, because low pressure designs other than blowdown tanks can be realized, manufacturing costs can be significantly reduced.