聚合物系动态超临界流体脱挥过程中的质量传递

MASS TRANSFER IN DYNAMIC SUPERCRITICAL FLUID DEVOLATILIZATION PROCESS FOR POLYMER SYSTEMS

测定了温度为 343K ,压力为 18MPa ,CO2 流量分别为 1 93、 3 2 7和 5 6 2L·min-1条件下聚苯乙烯颗粒基质中的挥分量与时间的关系 ,以研究聚合物系动态超临界流体脱挥 (SFDV)过程的质量传递规律 .根据传质理论建立了一个理想的动态SFDV过程的传质模型 ,用本模型对实验数据进行分析 ,结果表明本模型反映了聚合物系SFDV过程的基本特征 .因此 ,本模型能用于工业聚合物系SFDV装置的设计及基质中挥分含量的定量分析 .

Volatile matter quantities of styrene/polystyrene (ST/PS) system at different times were determined by dynamic supercritical fluid devolatilization (SFDV) using pure CO2 at 343 K at ISMPa and different flows of 1.93, 3.27 and 5.62 L&middotmin-1 gas CO2, to investigate mass transfer out of polymer matrix in dynamic SFDV process. An ideal diffusion model was derived by means of mass transfer theory. Comparison of model predictions with experimental results showed that the model reflected the essential features of polymer dynamic SFDV process. The model is useful in the design of industrial polymer SFDV process and quantitative analysis of volatile matter in polymer matrices.