C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 17/38 (2006.01) C07C 21/06 (2006.01) C07C 41/34 (2006.01) C07C 43/16 (2006.01) C07C 67/48 (2006.01) C07C 69/15 (2006.01) C07C 69/54 (2006.01) C07C 253/34 (2006.01) C07C 255/08 (2006.01) C07D 307/60 (2006.01) C08F 6/00 (2006.01)
Patent
CA 2065486
Abstract of the Disclosure 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 Nm3/hr per ton of the monomer from the initiation of the monomer recovery till the pressure in the polymerizer reaches 2.5 kg/cm2G 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/cm2G. 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.
Amano Tadashi
Shigemitsu Minoru
Shin-Etsu Chemical Co. Ltd.
Swabey Ogilvy Renault
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