NF membranes have been prepared from α, β, γ‐cyclodextrin (CD) composite with polysulfone and characterized by pore size, thickness, pure water permeability, contact angle measurement and membrane morphology study. The permeation performances of the prepared membranes have been tested for separation of acetic acid from dilute aqueous solution. Effect of concentration, pressure, flow rate on flux and rejection have been calculated and interpreted. Different permeation models have been tested for experimental values and validated by comparing the values with the experimental data. It has observed that in β‐CD membranes 99% recovery of acetic acid from aqueous solution has been obtained and found to be the best membrane for separation of acetic acid from dilute solution. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40537.

a-Cyclodextrin membranes were prepared by the phase inversion method using four types of casting solvents such as N-methyl pyrrolidone (NMP), dimethyl sulfoxide (DMSO), dimethyl acetamide (DMAc), and dimethyl formamide (DMF) herein-after termed as a-CD-NMP, a-CD-DMSO, a-CD-DMAc, and a-CD-DMF, respectively. The membranes were characterized by IR, XRD, TGA-DTA, DSC, and SEM analysis and show that solvents like NMP, DMA, DMF give good uniform morphological membranes and are better than that of DMSO. Thermal decompositions of the pure polymer and composite membranes indicate different range of thermal degradation of the membrane. This study reveals that the casting solvents NMP, DMF, DMAC have nearly same significant effect on morphology and other properties of the membranes. This is explained in terms of demixing behavior of the polymer and the combined effect of solvent volatility and polymer-solvent interactions as estimated from Hansen solubility parameter. Solvent hydrophobicity also affects the performance of the membrane and can be determined in terms of water permeability.

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Membranes for separation of alcohols from aqueous solutions were prepared from α, β, γ-cyclodextrin separately and characterized for Membrane thickness, Pore diameter, Pure water permeability, Water uptake, Contact angle and membrane morphology study. Permeation performance of the membranes was tested for primary alcohols such as methanol, ethanol and butanol. Effect of process parameters on flux and rejection of the membranes were studied and permeation models were analyzed. It was observed that β-CD membranes give 99% separation of alcohols from 1.73 molL-1-0.766 molL-1 solution at pressure 3 bar. Highest flux value was found to be 91.3 Lm-2 hr-1-87.3 Lm-2 hr-1 .