Method for recovering unreacted monomers after preparation of vi

Details Method for recovering unreacted monomers after preparation of vi Method for recovering unreacted monomers after preparation of vi

1992-03-30

1993-05-18

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Removing only nonpolymerized or nonpolymerizable material...

5263442, 528501, C08F 216

Patent

active

052122654

ABSTRACT:
A method for recovering unreacted monomers during preparation of a vinylic polymer comprises the steps of polymerizing a vinyl monomer in an aqueous medium in a polymerizer and then recovering unreacted monomers from the polymerization system, wherein a gas evacuation rate per unit charge weight of the monomer is controlled to the range of from 60 to 300 Nm.sup.3 /hr per ton of the monomer from the initiation of the monomer recovery till the pressure in the polymerizer reaches 2.5 kg/cm.sup.2 G and a superficial gas linear velocity is reduced to a level of not more than 0.008 m/sec when the pressure in the polymerizer reaches 2.5 kg/cm.sup.2 G. The method makes it possible to recover unreacted monomers quickly without causing carrying over of polymer particles formed and is effective to maintain high quality of vinylic polymers produced.

REFERENCES:
patent: 4205149 (1980-05-01), Cich et al.
patent: 4694055 (1987-09-01), Itoh et al.

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