02287nas a2200241   4500008004100000022001400041245007600055210006900131260000800200300001100208490000800219520153700227653002101764653002001785653001801805653002701823653001801850653001101868100001701879700002001896700002201916856010701938       2024                        eng d  a0376-738800aChemodialysis of organic acids using ABPBI-based hollow fiber membranes0 aChemodialysis of organic acids using ABPBIbased hollow fiber mem  cJAN  a1221530 v6893 a<p>
	Organic acids are a class of essential commodity chemicals used in various industries. Their production methods are shifting from conventional chemicals to fermentation, driven by green process strategies, environmental regulations, cost feasibility, etc. Separating formed acid from the fermentation broth is a primary technological barrier. Conventional methods are complex and impose environmental issues. A promising approach, `Chemodialysis,' capable of transforming the techno-economical feasibility of acid recovery scenario by reducing the number of steps, needs further investigation. This work evaluates scalable hollow fiber membranes based on poly(2,5-benzimidazole) (ABPBI) for chemically assisted dialysis, viz., Chemodialysis. Sorption analyses of commercially significant organic acids (acetic, lactic, and glycolic acid) and nonacidic solutes (NaCl and glucose) were performed using conventional flat sheet samples to assess their role in governing permeation characteristics. The transport properties of acids in the presence of NaCl and glucose as co-solutes were analyzed using hollow fiber membranes. The high selectivity of acid over nonacidic solutes ranges from 400-22,400, coupled with high acid permeability, enhances the applicability of Chemodialysis for the separation of acids using hollow fiber membranes. The fluxes of acids (acetic, glycolic, and lactic) through dense, similar to 100 mu m thick, scalable hollow fiber membranes ranging from 10.9 to 13.12 g/m(2)h are highly appreciable.</p>
10a5-benzimidazole)10aAcid separation10aChemodialysis10aHollow fiber membranes10aOrganic acids10aPoly(21 aGawas, Saroj1 aAlladi, Lavanya1 aKharul, Ulhas, K.  uhttp://library.ncl.res.in/content/chemodialysis-organic-acids-using-abpbi-based-hollow-fiber-membranes02157nas a2200193   4500008004100000022001400041245011300055210006900168260000900237490000800246520143500254653001401689653002601703653004001729100002001769700002101789700002201810856013101832       2025                        eng d  a0021-899500aPoly(2,5-Benzimidazole) as a membrane material for solvent dehydration: effect of bound methanesulfonic acid0 aPoly25Benzimidazole as a membrane material for solvent dehydrati  cNOV 0 v1423 a<p>
	Towards addressing issues of solvent stability of polymeric membrane materials for pervaporation (PV), this work investigates thermochemically robust poly(2,5-benzimidazole) (ABPBI) bound with methane sulfonic acid (MSA) for solvent dehydration, for the first time to our knowledge. Phase inversion membranes with and without bound-MSA were prepared, thermally treated at different temperatures up to 350 degrees C, and analyzed for physical and pervaporation properties. The physical characterizations (FTIR, WAXD, TGA, XPS, SEM, and EDX) and sorption analysis were performed using flat sheet membranes, whereas hollow fiber membranes were used for the pervaporation analysis with chosen solvents (alcohols and two polar aprotic solvents). Physical characterizations established the presence of MSA and the nonporous, dense nature of membranes, irrespective of their treatment temperatures. The sorption of pure solvents in the membrane is primarily affected by thermal treatment of the membranes. The pervaporation analysis was performed using different solvent: Water feed compositions. Using 85:15 as the feed, the average separation factors for dehydration of isopropanol, acetonitrile, and N,N-dimethylformamide (DMF) were 393, 213, and 185, respectively, with an appreciable ``pervaporation separation index.'' The long-term membrane performance till 360 h was analyzed to shed light on practical applicability.</p>
10amembranes10aseparation techniques10asynthesis and processing techniques1 aAlladi, Lavanya1 aLele, Ashish, K.1 aKharul, Ulhas, K.  uhttp://library.ncl.res.in/content/poly25-benzimidazole-membrane-material-solvent-dehydration-effect-bound-methanesulfonic-acid