Vatani M, Raisi A, Pazuki G
Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic) Hafez Ave, P. O. Box 15875-4413 Tehran Iran
RSC Adv. 2018 Jan 26;8(9):4713-4725. doi: 10.1039/c7ra13382k. eCollection 2018 Jan 24.
In the present study, dual-layer mixed matrix membranes (MMMs) were prepared by incorporating ZSM-5 zeolite into poly(ether--amide) (PEBA) as an active layer on the polyethersulfone (PES) membrane as a support layer for pervaporation separation of ethyl acetate (EAc) from EAc/water mixtures. The ZSM-5 zeolite nanoparticles were synthesized by the hydrothermal technique and characterized using XRD, XRF and FESEM analysis. The ATR-FTIR, SEM, DSC and contact angle tests were used to characterize the fabricated MMMs. The effect of ZSM-5 concentration on the performance of the membranes was investigated by the pervaporation experiments and the results showed that loading 10% wt% ZSM-5 into the PEBA matrix had the best separation performance. The effect of feed concentration (1-5 wt%) and operating temperature (30-50 °C) on the separation factor and permeation flux of the neat PEBA/PES and PEBA/PES membranes containing 10 wt% ZSM-5 were studied at laminar and turbulent feed flow regimes. Analysis of variance was used to investigate the interaction effect of EAc concentration and temperature on the performance of the prepared membranes. It was observed that both feed concentration and temperature had positive effects on the total permeation flux and separation factor. The ZSM-5/PEBA/PES membrane containing 10 wt% ZSM-5 showed a separation factor and total flux of 124.94 and 1882 g m h at laminar flow and 134.22 and 1985 g m h at turbulent flow, respectively for a feed concentration of 5 wt% and temperature of 50 °C.
在本研究中，通过将ZSM-5沸石掺入聚（醚 - 酰胺）（PEBA）中制备双层混合基质膜（MMM），作为活性层，以聚醚砜（PES）膜作为支撑层，用于从乙酸乙酯（EAc）/水混合物中进行渗透汽化分离乙酸乙酯（EAc）。采用水热技术合成了ZSM-5沸石纳米颗粒，并通过XRD、XRF和FESEM分析对其进行了表征。利用ATR-FTIR、SEM、DSC和接触角测试对制备的MMM进行了表征。通过渗透汽化实验研究了ZSM-5浓度对膜性能的影响，结果表明，在PEBA基质中负载10%（重量）的ZSM-5具有最佳的分离性能。在层流和湍流进料流态下，研究了进料浓度（1-5重量%）和操作温度（30-50°C）对纯PEBA/PES和含有10重量%ZSM-5的PEBA/PES膜的分离因子和渗透通量的影响。采用方差分析研究了EAc浓度和温度对制备膜性能的相互作用影响。观察到进料浓度和温度对总渗透通量和分离因子均有积极影响。对于进料浓度为5重量%和温度为50°C的情况，含有10重量%ZSM-5的ZSM-5/PEBA/PES膜在层流时的分离因子和总通量分别为124.94和1882 g m⁻² h⁻¹，在湍流时分别为134.22和1985 g m⁻² h⁻¹。
