聚苯乙烯的超临界流体脱挥

DEVOLATILIZATION OF POLYSTYRENE BY SUPERCRITICAL FLUID

在对聚苯乙烯在超临界二氧化碳中的溶解度研究基础上 ,确定了聚苯乙烯超临界脱挥的操作条件是 ,温度为343K,压力为 1 8MPa。实验发现 ,CO2 流量与 PS投料比为 2 .0～ 3.0标 LCO2 /h.g PS较合适 ,在以上脱挥条件下 ,初始浓度为 1 %的 PS/St的聚合物体系脱挥 3h后 ,则可将 PS中的 St含量降低到约 2 60 ppm。

On the basis of study on the solubility of the St from the PS in SC CO 2, operation pressure was selected in 18 MPa at 343 K. The experimental results show that the optimal feed ratio of CO 2 to PS is 2.0~3.0 L CO 2 (h·g PS). The supercritical fluid devolatilization(SFDV) of the PS is put into effect under the conditions above, the concentration of the St in the PS can be lowered to about 260 ppm from the initial concentration of the St 1% within 3 h.