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Maxwell-Stefan理论模拟NaA沸石膜分离一氯甲烷中微量水的渗透特性

Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2009-12-15

Journal: 过程工程学报

Included Journals: CSCD、ISTIC、PKU、Scopus

Volume: 9

Issue: 6

Page Number: 1068-1073

ISSN: 1009-606X

Key Words: NaA沸石膜;Maxwell-Stefan理论;蒸汽渗透;水的渗透性能;一氯甲烷

Abstract: 通过热浸渍晶种法制备了高质量的NaA沸石膜,并将其应用于蒸汽渗透脱除一氯甲烷中的微量水.实验结果表明,NaA膜对该体系显示了优异的分离性能,水对一氯甲烷的分离系数高达74831,产品中的水含量从0.2582%(ω)降低到0.005%(ω).将基于Maxwell-Stenfan理论和Langmuir理想吸附理论推导的吸附-扩散模型用于模拟水渗透流速与渗透侧真空度和进料温度的关系,预测趋势与实验值吻合很好,且拟合得到的参数与文献报道较接近,表明水蒸汽在NaA沸石膜中的传递为表面扩散机制,水蒸汽的吸附对渗透速率的贡献很大.水蒸汽的吸附热为-34.15 kJ/mol.

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