01613nas a2200241   4500008004100000022001400041245013800055210006900193260008600262300001200348490000700360520069800367653001901065653001701084653001301101653001701114653001701131100002501148700002201173700002701195700002201222856012701244       2010                        eng d  a0149-639500aPolyarylate based thin film composite (TFC) membranes: effects of coating parameters, gutter layer, and intrinsic material properties0 aPolyarylate based thin film composite TFC membranes effects of c  a325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcJAN  a163-1710 v453 a<p>Investigations in thin film composite (TFC) membrane formation with polyacrylonitrile ultrafiltration membrane as a support and three polyarylates with sequentially increased polarity are reported. Effects of TFC membrane preparation parameters viz., concentration of the coating solution, dip time, presence of solvent in pores of UF membrane support, and presence of the gutter layer were examined towards the formation of the selective skin layer, which was assessed by gas permeation analysis. TFC membranes prepared using dimethyl bisphenol-A based polyarylate exhibited similar to 3 orders of magnitude higher permeability and comparable selectivity as that of its dense membrane.</p>10aGas permeation10agutter layer10apolarity10apolyarylates10aTFC membrane1 aChendake, Yogesh, J.1 aBhole, Yogesh, S.1 aLohokare, Harshada, R.1 aKharul, Ulhas, K.  uhttps://library.ncl.res.in/content/polyarylate-based-thin-film-composite-tfc-membranes-effects-coating-parameters-gutter-002465nas a2200229   4500008004100000022001400041245009900055210006900154260007800223300001100301490000700312520162300319653001901942653002501961653001901986653002002005653001302025653002202038100002502060700002202085856012802107       2012                        eng d  a1944-399400aTransport of inorganic acids through polybenzimidazole (PBI) based membranes by chemo-dialysis0 aTransport of inorganic acids through polybenzimidazole PBI based  a36 WALCOTT VALLEY DRIVE,, HOPKINTON, MA 01748 USAbDESALINATION PUBLcJAN  a96-1030 v383 a<p>A process of chemo-dialysis involving poly(benzimidazole) (PBI) as a chemically active membrane material is proposed for the transport of inorganic acids. These membranes possessing basic nature selectively bind acid molecules present in the feed solution due to acid-base interactions. They are transported across the membrane by concentration gradient as the driving force. The transported acid molecules are stripped away from other side of the membrane surface by a suitable stripping agent or water. Effects of nature of feed acid (pK(a), molecular size), its concentration in the feed solution and the nature of stripping agent (base or water) on acid transport properties are presented. Membranes showed appreciable transport rates for three acids, viz., H2SO4, HCl and HNO3. The fluxes for different acids varied from 16.1 to 140.7 g/m(2) h under different operating conditions. Most significantly, there was no transport of non-acidic solutes such as NaCl or glucose. This could be made possible since these solutes neither get sorbed in the membrane matrix, nor does the membrane exhibit any porosity for the transport to occur through pores. This resulted in practically infinite selectivity of transported acid over the non-acidic solutes. Use of water as the stripping agent allows recycling of the acid, making the process economically attractive. Moreover, possible recovery of acid and its reuse eliminated the requirement of acid neutralization and disposal; which is a routine practice followed today. Thus, this process of chemo-dialysis is economically attractive and environmentally benign.</p>10aAcid transport10aChemical interaction10aChemo-dialysis10aInorganic acids10aMembrane10aPolybenzimidazole1 aChendake, Yogesh, J.1 aKharul, Ulhas, K.  uhttps://library.ncl.res.in/content/transport-inorganic-acids-through-polybenzimidazole-pbi-based-membranes-chemo-dialysis-0