Otvagina Ksenia V, Penkova Anastasia V, Dmitrenko Maria E, Kuzminova Anna I, Sazanova Tatyana S, Vorotyntsev Andrey V, Vorotyntsev Ilya V
Laboratory of Membrane and Catalytic Processes, Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minin St., Nizhny Novgorod 603950, Russia.
St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia.
Membranes (Basel). 2019 Mar 7;9(3):38. doi: 10.3390/membranes9030038.
Pervaporation has been applied for tetrahydrofuran (THF) dehydration with novel composite membranes advanced by a thin selective layer composed of chitosan (CS) modified by copolymerization with vinyl monomers, acrylonitrile (AN) and styrene, in order to improve the chemical and mechanical stability of CS-based membranes. Composite membranes were developed by depositing a thin selective layer composed of CS copolymers onto a commercially-available porous support based on aromatic polysulfonamide (UPM-20). The topography and morphology of the obtained materials were studied by atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). Thermal properties and stability were determined by coupled evolved gas analysis (EGA-MS). Transport properties were estimated in pervaporation dehydration of THF. The effect of operating parameters for the pervaporation dehydration of THF such as feed compositions and temperatures (295, 308 and 323 K) was evaluated. It was shown that CS modification with different vinyl monomers led to a difference in physical and transport properties. The composite membrane with the thin selective layer based on CS-PAN copolymer demonstrated optimal transport properties and exhibited the highest water content in the permeate with a reasonably high permeation flux.
渗透蒸发已应用于四氢呋喃（THF）脱水，采用的新型复合膜由与乙烯基单体（丙烯腈（AN）和苯乙烯）共聚改性的壳聚糖（CS）构成的薄选择层制成，以提高基于CS的膜的化学和机械稳定性。通过将由CS共聚物组成的薄选择层沉积在基于芳族聚磺酰胺的市售多孔载体（UPM - 20）上制备复合膜。通过原子力显微镜（AFM）、扫描电子显微镜（SEM）和X射线衍射分析（XRD）研究所得材料的形貌和形态。通过耦合逸出气体分析（EGA - MS）测定热性能和稳定性。在THF的渗透蒸发脱水中估算传输性能。评估了THF渗透蒸发脱水操作参数（如进料组成和温度（295、308和323 K））的影响。结果表明，用不同乙烯基单体对CS进行改性会导致物理和传输性能的差异。基于CS - PAN共聚物的薄选择层的复合膜表现出最佳的传输性能，并且在渗透物中表现出最高的水含量以及相当高的渗透通量。
