This work aims at investigating the special application of ZSM‐5/polydimethylsiloxane (PDMS) membrane being used for pervaporation separation of levulinic acid aqueous solutions. The effects of temperature, downstream pressure, feed concentration, and raw material ratio on the separation performance are investigated by self‐made flat‐sheet films. When the flow rate of feed pump remained at 0.4 ml/min (10 wt% levulinic acid), a levulinic acid permeation flux of 334.13 g/(m²h) and a separation factor of 2.382 at 75°C are observed over the composite membrane doped with 10 wt% ZSM‐5. In addition, the acid resistance is enhanced after the PDMS membranes are doped with ZSM‐5. Besides, the functionalized process also makes the membranes increase in its hydrophobicity. The results demonstrate that the ZSM‐5/PDMS‐based membranes show profound prospects for separating levulinic acid aqueous solution.

中文翻译：

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ZSM-5 / PDMS复合膜全蒸发分离乙酰丙酸水溶液

这项工作旨在研究ZSM-5 /聚二甲基硅氧烷（PDMS）膜在乙酰丙酸水溶液全蒸发分离中的特殊应用。用自制的平板薄膜研究了温度，下游压力，进料浓度和原料比对分离性能的影响。当进料泵的流量保持在0.4 ml / min（10 wt％乙酰丙酸）时，乙酰丙酸渗透通量为334.13 g /（m ^2）h）并且在掺杂10 wt％ZSM-5的复合膜上观察到在75°C时的分离系数为2.382。此外，用ZSM-5掺杂PDMS膜后，耐酸性得到增强。此外，功能化过程还使膜的疏水性增加。结果表明，基于ZSM-5 / PDMS的膜对分离乙酰丙酸水溶液具有广阔的前景。