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经实验研究,确定了聚苯乙烯超临界流体脱挥的优化操作条件:温度为343K,压力为18MPA,CO2与PS的投料比为2.0~3.0LCO2/H?GPS.在该条件下脱挥3H,可使聚苯乙烯中的挥分含量从1％降至0.2％“,”On the basis of study on the solubility of t he ST from the PSinSC-CO2,operation pressure was selected in18MPa at343K.And the optimal feedratioofCO2toPSwas2.0～3.0LCO2/h.gPS The supercritical fluid devolatilization (SFDV) of the PS was putinto efect under the conditions above,the concentration of the STinthePScanbeloweredtoabout0.2%fromtheinitialconcentrationoftheST1%in3hours.