Dehydration of 1,4-dioxane by pervaporation using crosslinked calcium alginate-chitosan blend membranes

Reddy, A. Subba; Kalyani, Swayampakula; Kumar, Nadavala Siva; Boddu, Veera M.; Krishnaiah, A.

doi:10.1007/s00289-008-1003-x

Cited by 26 publications

(15 citation statements)

References 24 publications

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“…Pervaporation separation index (PSI) is a measure of the separation capability of a membrane and is expressed as a product of separation factor and flux

PSI = Ji \times α

…”

Section: Methodsmentioning

confidence: 99%

Thin film composite sodium alginate membranes for dehydration of acetic acid and isobutanol

Badiger

Shukla

Kalyani

et al. 2013

J of Applied Polymer Sci

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Dehydration of widely used organic solvents such as acetic acid (AA) and isobutanol (IB) is challenging tasks, which form close boiling mixtures with water. Sodium alginate (SA) thin film composite membranes were prepared and crosslinked with 2,4-toluene diisocyanate (TDI) and glutaraldehyde for dehydration of IB and AA/water mixtures through pervaporation (PV). The crosslinked and uncrosslinked SA composite membranes were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and universal testing machine for intermolecular interactions, crystalline nature, thermal stability, surface morphology, and tensile strength, respectively. At a feed composition of 98 wt % IB and 95 wt % AA aqueous solutions, the TDI crosslinked SA composite membrane exhibited separation factors of 3229 and 708 with reasonable fluxes of 0.021 and 0.012 kg m 22 h 21 , respectively. The results obtained in the study for IB and AA systems were compared with other SA membranes reported in the literature. The membranes appeared to have potential for commercial PV ability to dehydrate the solvents up to desirable purity levels (>99%) and feasibility of preparing them in a composite form which would enable scale-up into modular configurations.

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“…Pervaporation separation index (PSI) is a measure of the separation capability of a membrane and is expressed as a product of separation factor and flux

PSI = Ji \times α

…”

Section: Methodsmentioning

confidence: 99%

Thin film composite sodium alginate membranes for dehydration of acetic acid and isobutanol

Badiger

Shukla

Kalyani

et al. 2013

J of Applied Polymer Sci

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“…In pervaporation process, the upstream layer of the membrane is always swollen and plasticized due to absorption of selective permeants. However, the membrane at the downstream side is virtually dry due to continuous evacuation of permeate, and therefore membrane acts as a restrictive barrier for permeation of molecules even though it was swollen at the upstream side [40]. This restriction becomes predominant with increasing the thickness of the dry layer.…”

Section: Effect Of Membrane Thickness On Pervaporationmentioning

confidence: 99%

Preparation and pervaporation performance of chitosan-poly(methacrylic acid) polyelectrolyte complex membranes for dehydration of 1,4-dioxane

Choudhari

Premakshi

2016

Polym Eng Sci

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Polyelectrolyte complex (PEC) membranes composed of chitosan (CS) and poly(methacrylic acid) (PMAA) were prepared by mixing the polymer solutions in different ratios. The chemical interaction and crystallinity of the resulting PEC membranes were respectively analyzed by Fourier transform infrared spectroscopy (FTIR) and wide-angle Xray diffraction (WAXD). Differential scanning calorimetry (DSC) was used to characterize the thermal properties of the membranes. The membranes thus obtained were subjected to pervaporation (PV) separation of water-dioxane mixtures. Among the PEC membranes, membrane containing 30 wt% ratio of PMAA (M-3) exhibited the highest separation selectivity of 840 with a flux of 12.07 3 10 22 kg/m 2 h at 308C at 15 wt% of water in the feed. By the incorporation of NaY zeolite into PEC up to 5 wt%, we have been able to overcome the trade-off phenomenon existing between flux and selectivity in PV process. From the temperature dependent diffusion and permeation values, the Arrhenius activation parameters were estimated. The resulting activation energy values obtained for water permeation (E pw ) are much lower than those of dioxane permeation (E po ), suggesting that the developed membranes have higher separation efficiency for waterdioxane system. Based on the heat of sorption (DH s ) values, the mode of sorption was discussed. POLYM. ENG. SCI.,

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“…Sodium alginate (SA) is a low cost, environmentally safe, nontoxic, weak acidic, and an anionic, linear‐chained natural polysaccharide. In recent years, it has gained more importance due to its excellent properties and gel‐forming ability with polyvalent metal ions or glutaraldehyde, and it has been used in various applications such as controlled drug delivery ; in the dehydration of some organic solvents by pervaporation ; the removal of dyes or heavy metal ions from aqueous solutions ; in textile industry ; and in food industry . SA is a binary copolymer of β‐(1–4)‐linked‐D‐mannuronic acid (M) and α‐(1–4)‐linked‐L‐guluronic acid (G) units with varying contents of M and G blocks.…”

Section: Introductionmentioning

confidence: 99%

“…The crosslinking of SA with polyvalent metal ions can improve the properties of film such as water resistance, mechanical and barrier properties, cohesiveness, and rigidity . The gel‐forming ability of alginates is closely related to the content and length of G blocks . G blocks are mainly responsible for the gel formation with the egg‐box structure, whereas M blocks are responsible for the ion exchange and sorption property of SA .…”

Section: Introductionmentioning

confidence: 99%

Dielectric, thermal, and swelling properties of calcium ion-crosslinked sodium alginate film

et al. 2013

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In this study, Ca 21 -crosslinked sodium alginate (SA) gel films (SA-Ca/SA2-Ca) have been prepared, and their structural and thermal characterizations were investigated using fourier transform infrared spectroscopy, Xray diffraction, differential scanning calorimetry, and thermogravimetric analysis, respectively. Dielectric characterization was performed at room temperature in the frequency range of 12 Hz-100 kHz. The equilibrium swelling value (ESV) of gel films was determined both in distilled water and in 0.1 M sodium chloride (NaCl) solution at room temperature. Sodium alginate films (SA/ SA2) were also prepared for use as reference. The effect of the crosslinking of sodium alginate on the dielectric and thermal properties of gel films was investigated by comparing the properties of gel films with those of SA/ SA2 films. Although ESV of Ca 21 -crosslinked SA film in distilled water is about 350 g H 2 O /g polymer , it decreased into one third in 0.1 M NaCl solution. The crosslinking of SA did not significantly affect the thermal properties, but it decreased the b-relaxation associated with the polar side groups. Frequency spectra of electric modulus, impedance and Cole-Cole plots confirmed the higher conductance values of SA-Ca films at low frequencies than those of SA film due to the presence of by-product of crosslinking. POLYM. ENG. SCI., 54:1372-1382,

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Dehydration of 1,4-dioxane by pervaporation using crosslinked calcium alginate-chitosan blend membranes

Cited by 26 publications

References 24 publications

Thin film composite sodium alginate membranes for dehydration of acetic acid and isobutanol

Thin film composite sodium alginate membranes for dehydration of acetic acid and isobutanol

Preparation and pervaporation performance of chitosan-poly(methacrylic acid) polyelectrolyte complex membranes for dehydration of 1,4-dioxane

Dielectric, thermal, and swelling properties of calcium ion-crosslinked sodium alginate film

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