Apparatus for enhancing product quality of acrylonitrile-styrol copolymer

The invention relates to a petrochemical industry apparatus, and provides an apparatus for enhancing the product quality of an acrylonitrile-styrol copolymer, which is characterized in that a 1# flash evaporation device for removing acrylonitrile is provided and a 2# flash evaporation device used for removing toluene, styrene and residual acrylonitrile with minute quantity is provided. According to the invention, toluene is used as a diluent which has important meaning. The invention has the following beneficial effects that the thermal load of two flash evaporation device preheaters is smaller than that of the current devices, compared with the current apparatus, the dissipating energy is saved by 43500kJ/ton SAN resin product, the acrylonitrile is removed under the temperature of 110 DEG C, polymerization generation proportion of an acrylonitrile monomer which is not reacted is reduced, the yellow index of the product can be decreased to less than 5%; under same temperature, the viscosity of the toluene is