EXTRACTION OF ORGANIC-COMPONENTS FROM AQUEOUS STREAMS BY VACUUM MEMBRANE DISTILLATION

被引：110

作者：

SARTI, GC

GOSTOLI, C

BANDINI, S

机构：

[1] Dipartimento di Ingegneria Chimica e di Processo, Università degli Studi di Bologna, I-40136 Bologna, Viale Risorgimento

来源：

JOURNAL OF MEMBRANE SCIENCE | 1993年 / 80卷 / 1-3期

关键词：

VACUUM MEMBRANE DISTILLATION; VOLATILE ORGANICS; EVAPORATION; MICROPOROUS MEMBRANES;

D O I：

10.1016/0376-7388(93)85129-K

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The removal of volatile organic compounds from aqueous streams by vacuum membrane distillation (VMD) has been analyzed. VMD is an evaporation process which takes place through microporous hydrophobic membranes; at low pressure the mass transfer through the membrane is generally dominated by the Knudsen mechanism, while the process selectivity is essentially determined by the liquid-vapor equilibrium conditions existing at the interface. Dilute aqueous mixtures containing ethanol or methylterbutyl ether have been experimentally investigated, in a wide range of operating conditions. The role of concentration-polarization phenomena on the separation factor was also investigated. A detailed model of the transport phenomena involved in the process is developed and compared with the experimental data. A VMD system is finally designed for the purification of waste waters and the related treatment costs are evaluated.

引用

页码：21 / 33

页数：13

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