Membrane Separations Group, Chemical Engineering Division, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India.
Membrane Separations Group, Chemical Engineering Division, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India.
Carbohydr Polym. 2018 Aug 1;193:28-38. doi: 10.1016/j.carbpol.2018.03.069. Epub 2018 Mar 20.
Present work reports the synthesis of a novel Chitosan-Polytetrafluoroethylene composite membrane with solvent resistant property for efficient separation of methanol/toluene mixture by pervaporation. The composite was crossed with tetraethyl orthosilicate (TEOS) to prevent or reduce membrane swelling and improve the separation factor. The synthesized membranes were characterized by SEM, FTIR and DSC analysis. Molecular dynamics (MD) simulation and computational fluid dynamics were coupled to predict the structural and diffusive properties besides concentration profile inside the membrane. Diffusion coefficients of methanol and toluene were found to be 1.7 × 10 and 1.8 × 10 m/s, respectively. The effect of crosslinking on process parameters such as flux and separation factor was analyzed. The study confirmed that increasing TEOS concentration reduced the methanol flux but enhanced separation factor with respect to this alcohol. The membranes exhibited a flux of 0.13 kg/m h and separation factor of 58.4 for azeotropic feed composition of 68 wt% methanol.
本工作报道了一种具有溶剂稳定性的新型壳聚糖-聚四氟乙烯复合膜的合成，该复合膜可通过渗透蒸发有效地分离甲醇/甲苯混合物。该复合膜用四乙氧基硅烷（TEOS）交联，以防止或减少膜溶胀，提高分离因子。通过 SEM、FTIR 和 DSC 分析对合成的膜进行了表征。将分子动力学 (MD) 模拟和计算流体动力学相结合，以预测膜内结构和扩散特性以及浓度分布。发现甲醇和甲苯的扩散系数分别为 1.7×10 和 1.8×10 m/s。分析了交联对通量和分离因子等工艺参数的影响。研究证实，随着 TEOS 浓度的增加，甲醇通量降低，但相对于该醇，分离因子提高。对于共沸进料组成（甲醇 68wt%），膜的通量为 0.13kg/m h，分离因子为 58.4。
