PERVAPORATIVE REMOVAL OF VOLATILE ORGANIC COMPOUNDS FROM MULTICOMPONENT AQUEOUS MIXTURES
PERVAPORATIVE REMOVAL OF VOLATILE ORGANIC COMPOUNDS FROM MULTICOMPONENT AQUEOUS MIXTURES
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DOI：
10.1081/ss-120014443
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发表时间：
2002-01
影响因子：
2.8
通讯作者：
W. Kujawski;Renata Roszak
中科院分区：
文献类型：
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作者：
W. Kujawski;Renata Roszak
本研究涉及使用不同的亲有机膜（即，PERVAP-1060-聚二甲基硅氧烷、PERVAP-1070-沸石填充的聚二甲基硅氧烷、PEBAX-4033-聚醚嵌段酰胺）。研究了以下二元和三元液体混合物：水-乙酸甲酯、水-乙酸乙酯、水-乙酸丁酯、水-甲基叔丁基醚（MTBE）和水-甲醇-MTBE。这些混合物的有机成分可以在纺织、制药和石化工业的废水中找到。实验的重点是用于从水中去除有机物的研究膜的效率。在实验过程中，测定了间歇式渗透蒸发的分离因子（α）、渗透通量（J）和有机物去除率（Dr）。考察了进料温度、进料中有机物初始含量、进料体积与膜面积比（V/S）对膜分离效果的影响。结果表明，所有膜对水中挥发性有机物的去除都具有选择性。膜的选择性和传递特性以及效率参数不仅强烈地依赖于膜的种类和分离的进料混合物的种类，而且还依赖于工艺参数。PERVAP-1060膜在去除水中有机物方面表现出最好的效率，而PERVAP-1070膜是最具选择性的。PEBAX-4033膜的低得多的效率是由于PEBAX-4033膜的选择性层含有疏水和亲水嵌段这一事实造成的。比较给定膜与二元和三元混合物接触时的性质，指出与后者接触时的选择性和渗透通量较低。
The present study concerns with the separation of binary and ternary water–organics mixtures by pervaporation using different organophilic membranes (i.e., PERVAP-1060—polydimethylsiloxane, PERVAP-1070—zeolite filled polydimethylsiloxane, PEBAX-4033—polyether block amide). The following binary and ternary liquid mixtures were investigated: water–methyl acetate; water–ethyl acetate; water–butyl acetate, water–methyl t-butyl ether (MTBE), and water–methanol–MTBE. The organic components of these mixtures can be found in the wastewaters from textile, pharmaceutical, and petrochemical industries. The experiments were focused on the efficiency of investigated membranes used for the removal of organics from water. During the experiments, the following parameters characterizing system were determined: the separation factor (α), the permeate flux (J), and the degree of the removal of organics from water (D r) in the batch mode pervaporation. The influence of the feed temperature, the initial content of organics in the feed, and the feed volume to the membrane area (V/S) ratio were investigated. It was proved that all membranes were selective in the removal of volatile organic compounds from water. The selectivity and transport properties as well as the efficiency parameters were dependent strongly not only on the kind of the membrane and the kind of the separated feed mixture but also on the process parameters. The PERVAP-1060 membrane showed the best efficiency in the removal of organics from water, whereas the PERVAP-1070 membrane was the most selective one. Much lower efficiencies found for PEBAX-4033 membrane were caused by the fact that the selective layer of PEBAX-4033 membrane contained both the hydrophobic and hydrophilic blocks. Comparing the properties of a given membrane in contact with binary and ternary mixtures, it was stated that the selectivities and permeate fluxes were lower in contact with the latter ones.