Pervaporation separation of acetic acid‐water mixtures using modified membranes. I. Blended polyacrylic acid (PAA)‐nylon 6 membranes

Abstract

SynopsisMembranes consisting of ionically crosslinked polyacrylic acid (PAA) and Nylon 6 were prepared and tested for the pervaporation separation of acetic acid-water mixtures. The polyacrylic acid (PAA) membranes were crosslinked in aluminum nitrate aqueous solution while the polyacrylic acid (PAA)-Nylon 6 blends were cast from homogeneous PAA-Nylon 6 mixtures to appropriate thicknesses and then crosslinked in aqueous aluminum nitrate solutions. Optimum pervaporation results were obtained from blends of Nylon 6 and PAA in the weight ratio of 60-75 wtX Nylon 6 and 25-40 w t 8 PAA which have separation factors (water/acetic acid) of over 60 and flux rates higher than 100 g/m2 h at 15°C for the separation of acetic acid-water mixtures. The flux rates and separation factors could be altered by changing the blend composition of the membrane. The effects of the feed compmition on the separation factors were investigated.

Modification of poly(vinyl alcohol) membranes using sulfur-succinic acid and its application to pervaporation separation of water-alcohol mixtures

“…It is reported that the nylon 6/poly-(acrylic acid) blended membrane showed an in-EXPERIMENTAL crease of the separation efficiency and then a decrease. 2 This supported the existence of the hydroMaterials philic/hydrophobic balance criterion.…”

“…In order to adjust and control the select a polymer which is suitable for separating hydrophilic/hydrophobic balance properties of a polar-polar mixture systems, such as water-almembrane, several techniques have been tried, cohol mixtures, because of complex interactions such as crosslinking a polymer, 2,4 grafting a selecbetween the membrane material and the feed tive species onto an inert film, 4,5 copolymerizamixture to be separated. According to Huang and tion, [6][7][8] and blending a hydrophilic polymer with colleagues, [1][2][3][4] materials, including water-soluble a relatively hydrophobic polymer. 9 In reality, the introduction of a dicarboxylic acid (such as maleic This article was partly presented at the 8th North Ameriacid) as the crosslinking agent into poly(vinyl alcan Membrane Society Annual Meeting, May 18- 22, 1996, cohol) (PVA) enhances the selectivity of the memOttawa, Canada.…”

Pervaporation separation of aqueous alcohol solution through the membrane ofo-trimethylsilylphenylacetylene initiated by a tungsten carbene complex

“…There are a lot of researchers related to many kinds of membrane materials for separation aqueous alcohol mixtures by pervaporation. 6 -9 In addition, in order to improve the pervaporation performances (water permselectivity), many experimental attempts have been made to control the specific interaction between the membrane and the permeate by synthesis of a new hydrophilic polymer, 10 blending and crosslinking, 11 copolymerization, 12 and grafting a hydrophilic species onto an inert substrate. 13 Recently, several substituted polyacetylenes have been synthesized using groups V and VI transition metal catalyst.…”

Selective separation of water from aqueous alcohol mixtures through functionalized syndiotactic poly(styrene‐co‐4‐methylstyrene) membranes by pervaporation

“…Proceeding from the viewpoint of that mentioned above, many researchers have focused their attention on improving the membrane separation performance, including: membrane formation process, 60 Co ␥-ray irradiation or plasma grafting, polymer blending, chemical grafting, and preparing new polymers. [1][2][3][4][5][6][7][8] However, the key to successful pervaporation lies in the intrinsic properties of the polymers used to prepare membranes. From this, the development of novel pervaporation membranes with good separation performance is exceedingly important, because the syndiotactic polystyrene (SPS) exhibits excellent physical properties, such as a low dielectric constant, excellent hydrolytic and dimensional stability, good heat stability, chemical resistance, as well as low specific density.…”