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Abstract：
Composite membranes with a polyvinyl alcohol (PVA) selective layer composed of well-dispersed hydrophilic kaolinite particles coated on a polyvinylidene fluoride (PVDF) support were developed. They were applied to the pervaporation dehydration of the industrially important epichlorohydrin (ECH)/isopropanol (IPA)/water ternary mixture. In comparison with raw kaolinite (RK), hydrophilic kaolinite (HK) enhanced the mechanical properties, hydrophilicity, and thermal stability of the PVA selective layer, as confirmed by universal testing, the contact angle, and TGA analyses, respectively. The pervaporation results revealed that the addition of HK particles significantly enhanced the separation factor (3-fold). Only a marginal reduction in flux was observed with ECH/IPA/water, 50/30/20 (w/w %) at 40 °C. An HK particle concentration of 4 wt.% with respect to PVA delivered the highest flux performance of 0.86 kg/m2h and achieved a separation factor of 116. The PVA-kaolinite composite membrane exhibited pronounced resistance to the ECH-containing feed, demonstrating a sustained flux and separation factor throughout an extended pervaporation stability test lasting 250 h.
摘要：
开发了具有聚乙烯醇（PVA）选择性层的复合膜，该聚乙烯醇（PVA）选择性层由涂覆在聚偏二氟乙烯（PVDF）载体上的分散良好的亲水性高岭石颗粒组成。它们被应用于工业上重要的表氯醇(ECH)/异丙醇(IPA)/水三元混合物的渗透蒸发脱水。与原始高岭石(RK)相比，亲水性高岭石（HK）提高了机械性能，亲水性,和PVA选择性层的热稳定性，正如通用测试所证实的那样，接触角,和TGA分析，分别。渗透蒸发结果表明,加入HK颗粒显著提高了分离因子(3倍)。ECH/IPA/水仅观察到通量的边际降低，50/30/20(w/w%),40℃。HK颗粒浓度为4重量%。相对于PVA的%提供了0.86kg/m2h的最高通量性能，并实现了116的分离因子。PVA-高岭石复合膜对含ECH的进料表现出明显的抗性，在持续250小时的扩展渗透蒸发稳定性测试中，证明了持续的通量和分离因子。
