Dynamic Supercritical Fluid Devolatilization of Polymers

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Dynamic Supercritical Fluid Devolatilization of Polymers

YE Shuming^a; JIANG Kai^a; JIANG Chunyue^b; PAN Qinmin^c

^a College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou 310027, China ^b College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, China ^c Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario,Canada N2L 3G1

Received:1900-01-01 Revised:1900-01-01 Online:2005-12-28 Published:2005-12-28
Contact: YE Shuming

聚合物系动态超临界流体脱挥

叶树明^a; 蒋凯^a; 蒋春跃^b; 潘勤敏^c

^a College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou 310027, China
^b College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, China
^c Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario,Canada N2L 3G1

通讯作者: 叶树明

Abstract

Abstract: A number of studies have been reported on the applications of supercritical fluids to polymeric processes. The presence of volatiles can affect the end-use properties of polymer materials. Therefore, these volatiles must be reduced to a level below the maximum permissible limit. Conventional heat-rele vant techniques for polymer devolatilization sometimes have limited effectiveness. Devolatilization with supercritical fluids, however, can enhance removal of volatiles from polymers. A model for diffusion-limited extraction is used to characterize dynamic supercritical fluid devolatilization of spherical polymer particles. The rate of supercritical fluid devolailization for styrene/polystyrene system is measured at 343 K and 18 MPa and at CO2 flow rate of 1.93, 3.27 and 5.62 L·min^-1, respectively. The model analysis, which is consistent with experimental results, indicates that the supercritical flluid devolatilization is not solubility-limited but diffusion-limited when CO2 flow rate is above 4.00L·min^-1.

Key words: supercritical fluid devolatilization, supercritical CO2, diffusion coefficient, styrene, polystyrene

摘要： A number of studies have been reported on the applications of supercritical fluids to polymeric processes. The presence of volatiles can affect the end-use properties of polymer materials. Therefore, these volatiles must be reduced to a level below the maximum permissible limit. Conventional heat-rele vant techniques for polymer devolatilization sometimes have limited effectiveness. Devolatilization with supercritical fluids, however, can enhance removal of volatiles from polymers. A model for diffusion-limited extraction is used to characterize dynamic supercritical fluid devolatilization of spherical polymer particles. The rate of supercritical fluid devolailization for styrene/polystyrene system is measured at 343 K and 18 MPa and at CO2 flow rate of 1.93, 3.27 and 5.62 L·min^-1, respectively. The model analysis, which is consistent with experimental results, indicates that the supercritical flluid devolatilization is not solubility-limited but diffusion-limited when CO2 flow rate is above 4.00L·min^-1.

关键词: 聚合物系;动态超临界流体脱挥;苯乙烯;超临界二氧化碳;扩散系数;聚苯乙烯

YE Shuming, JIANG Kai, JIANG Chunyue, PAN Qinmin. Dynamic Supercritical Fluid Devolatilization of Polymers[J]. , DOI: .

叶树明, 蒋凯, 蒋春跃, 潘勤敏. 聚合物系动态超临界流体脱挥[J]. , DOI: .

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