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首页> 外文会议>16th Annual technical conference and exposition of the American Filtration and Separations Society >NANOFILTRATION OF ORGANIC SOLVENTS
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NANOFILTRATION OF ORGANIC SOLVENTS

机译：有机溶剂的纳米过滤

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Transport mechanisms and process limitations are relatively well understood for aqueousrnnanofiltration systems. Much work has also been done on the use of membranes for thernremoval of suspended matter from organic solvents. The removal of organic soluterncompounds from organic solvents using membrane technology has been addressed by veryrnfew workers, and little is known of the fundamental transport and separation mechanisms.rnThe work aims to enhance the understanding of non-aqueous nanofiltration by focussing onrnthe flux performance of organic solvents through a dense 2 μm polydimethylsiloxanern(PDMS) composite membrane. The flux of alcohols, n-alkanes, I-alkanes and cyclicrncompounds were studied in dead-end mode, at pressures of 10-900 kPa. Fluxes of 10–80rnl/m2hr were obtained for alkanes and cyclic compounds, whereas alcohol flux was aroundrntwo orders of magnitude lower. Results suggest that the solvent flux through PDMS takesrnplace via two distinct mechanisms, namely hydraulic and chemical transport. Hydraulicrntransport appears to dominate at pressures above 300 kPa, whereas chemical transportrnbecomes more apparent at lower pressures.rnComparison of the hydraulic transport data with a Hagen-Poisuelle model gives goodrnagreement for similar solvents. Swelling effects due to solvent-membrane interactions arernidentified as playing a major role in solvent flux behaviour, and compressibility effects arernalso thought to account for deviations from the Hagen-Poisuelle model.rnViscous flow was verified by a non-separation of mixtures of n-alkane and cyclicrncompounds, which suggests that the PDMS layer cannot sustain a dense structure when usedrnin organic solvent nanofiltration applications.rnThis study gives an insight into the mechanisms affecting solvent flux through densernmembranes, and forms a basis for rejection studies of organic solute compounds from organicrnsolvents.
机译：对于水纳米过滤系统，运输机理和工艺限制是相对很好理解的。关于使用膜从有机溶剂中除去悬浮物的工作也已经完成。很少有工作人员使用膜技术从有机溶剂中去除有机溶质化合物，对基本的运输和分离机理知之甚少。这项工作旨在通过关注有机溶剂的通量性能来增进对非水纳米过滤的理解。通过致密的2μm聚二甲基硅氧烷（PDMS）复合膜。在无端模式下，在10-900 kPa的压力下研究了醇，正构烷烃，异构烷烃和环状化合物的通量。烷烃和环状化合物的通量为10–80mL / m2hr，而醇通量则低两个数量级。结果表明，通过PDMS的溶剂流量是通过两种不同的机制发生的，即水力和化学传输。在高于300 kPa的压力下，水力输运似乎占主导地位，而在较低的压力下，化学输运则更为明显。与Hagen-Poisuelle模型进行的水力输运数据比较给出了相似溶剂的良好协议。溶剂-膜相互作用引起的溶胀作用被认为在溶剂通量行为中起主要作用，而可压缩性也被认为是与Hagen-Poisuelle模型的偏差。rn粘性流通过不分离正构烷烃混合物来验证以及环状化合物，这表明当用于有机溶剂纳滤应用时，PDMS层无法维持致密结构。这项研究深入了解了影响溶剂通过致密膜的通量的机制，并为有机溶剂中有机溶质化合物的排斥研究奠定了基础。

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