Chitosan‐Modified Polyvinyl Alcohol Membrane High Performance in Biodiesel/Methanol Pervaporation Separation

Abstract

The chitosan doped polyvinyl alcohol film are prepared by blending heating method. The prepared membrane is characterized by Fourier Transform Infrared Spectrometer (FTIR), scanning electron microscope (SEM), atomic force microscope (AFM) and universal testing machine. The surface of the cast membranes is generally flat, and the pervaporation process would cause the membrane to have a wrinkled shape. These membranes can be used for pervaporation to separate methanol/biodiesel mixtures. This paper studies the effects of different chitosan additions, feed temperature and feed concentration on membrane performance. When the chitosan doping amount is 30 % by mass of polyvinyl alcohol at 40°C, the maximum flux reaches 569.212 g m À 2 h À 1 . At the same time, the separation factor increases as the methanol concentration in the liquid decreases. When the methanol mass fraction is 10 %, the separation factor can reach 116.717.

Separation of acetone‐water mixtures by pervaporation using NaMMT‐loaded PVA‐chitosan nanocomposite IPN membranes

“…PVA was blended with chitosan (CS) for pervaporative separation of methanol from biodiesel. 21 For 30% CS in the blend, the membrane showed the highest flux of 569.21 g/m 2 h while for 10% methanol in feed, the separation factor achieved was 116.71. In a similar way in the present work, the blend of PVA and the natural polymer CS has been used as a PV membrane.…”

“…To increase the flux and water selectivity further, PVA was modified by several methods such as blending with other polymers, 6,7,9 using various crosslinkers 7,9,16,17 and also by incorporating different adsorptive fillers, 18 polyelectrolytes, 19 polymer coated fillers and copolymers 20 into the matrix of PVA. PVA was blended with chitosan (CS) for pervaporative separation of methanol from biodiesel 21 . For 30% CS in the blend, the membrane showed the highest flux of 569.21 g/m 2 h while for 10% methanol in feed, the separation factor achieved was 116.71.…”

“…It consists of 2-amino-2-deoxygluco-pyranose (glucosamine) linked by β (1-4)-glucosidic bonds with a small amount of unreacted, that is, 'acetylated' N-acetyl-2-amino-2-deoxy-D-glcopyranose (N-acetylglucosamine) units. 21 CS easily dissolves in acid solution. The amino (-NH 2 ) and the hydroxyl (-OH) functionalities of CS provide the hydrophilicity at the expense of poor chemical resistance.…”

“…The polymer PVA was chosen since PV membrane based on PVA has already been commercialized and PVA-CS blend membrane was also reported. 9,21,26,28 To increase the hydrophilicity of this blend membrane further, in the present work maleic acid (MA) was used as a common crosslinker for both PVA and CS, and the nano-sized sodium montmorillonite (NaMMT) clay was incorporated during the blending of these two polymers in water. This nano-clay not only increases the water permeability but it also enhances the durability of the membranes.…”

Synthesis of dual‐functionalized mixed matrix membrane with amino‐GO‐Bent/PVDF for efficient separation of CO2/CH4 and CO2/N2

“…Compared with traditional processes such as drying, evaporation, absorption, and adsorption, the membrane gas separation process does not involve phase changes and regeneration and can save up to 90% of energy. [5][6][7][8][9] Therefore, membrane-based separation technology is attractive because of its continuity and simplicity of operation, high efficiency, low energy consumption, simple equipment, low cost, modular and environmental friendliness, and is regarded as an ideal gas separation method. [10][11][12][13][14][15] Currently, among various membrane materials, polymeric membrane materials are mainly considered for industrial CO 2 separation because of their easy processing, simple synthesis method, and low cost.…”