RECUPERATING ETHYLENE AND VINYLACETATE FROM STREAM OF RESIDUAL GAS FORMED DURING SYNTHESIS OF COPOLYMER OF VINYL ESTER AND ETHYLENE Russian patent published in 2011 - IPC C08F6/10 C08F2/30 C08F218/08 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of recuperating unreacted monomers contained in a stream of residual gas formed during synthesis of a copolymer of vinyl ester and ethylene. Described is a method of producing copolymers containing vinyl ester or ethylene or ethylene unsaturated monomers via radical emulsion or suspension polymerisation in an aqueous medium at absolute pressure between 5 and 100 bars. At the end of polymerisation, the reaction mixture is throttled with reduction of its absolute pressure to 0.1-5 bars. Unreacted monomers are recuperated from the residual gas through multi-step fractionated condensation with deep cooling. At the first condensation step, water vapour is condensed at temperature ranging from -90 to -60°C, and at the third condensation step, ethylene is condensed at temperature ranging from 140 to 100 °C.

EFFECT: design of a method which enables extraction of valuable substances from the formed residual gas, where the said substances can be cheaply recycled.

9 cl, 2 dwg, 1 tbl, 1 ex