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乙醇分子在PPES,PPEK,PPESK膜中动态吸收和解吸实验研究
Study on sorption and desorption of ethanol molecules in PPES,PPEK and PPESK Membranes
【摘要】 用重量吸收法测定了298.15,303.15,308.15K下乙醇蒸气在PPEK,PPES,PPESK膜中吸收和解吸动力学数据.结果表明,随着温度的升高,乙醇在膜中的吸收/解吸行为由Non-Fick扩散向Fick扩散转变,乙醇蒸气在三种膜中吸收速度v(PPES)>v(PPESK)>v(PPEK),解吸速度v(PPEK)>v(PPESK)>v(PPES).
【Abstract】 The sorption and desorption curves of ethanol vapor in PPES,PPEK,PPESK membranes at 293.15 K, 298.15 K, 303.15 K have been measured using gravimetric sorption method(GS). It has been shown that the diffusion types are transferred from the non-Fickian diffusion to the Fickian diffusion as temperature increases. The tendency of sorption velocities of ethanol vapor in three kinds of the membranes were v(PPES)>v(PPESK)>v(PPEK) and the tendency of desorption velocities of ethanol vapor in three kinds of the membranes were v(PPEK)>v(PPESK)>v(PPES).
【Key words】 <Keyword>fickian diffusion; Non-fickian diffusion; sorption; desorption;
- 【文献出处】 膜科学与技术 ,Membrane Science and Technology , 编辑部邮箱 ,2005年03期
- 【分类号】TQ028.8
- 【被引频次】1
- 【下载频次】140