Separation of Carboxylic Acids from Carboxylates by Diffusion Dialysis

Narȩbska, Ånna; Staniszewski, Marek

doi:10.1080/01496390701787388

Cited by 28 publications

(10 citation statements)

References 19 publications

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“…It utilizes the difference in the electrochemical potential on both sides of the membrane as the driving force [13]. Donnan dialysis has applications in many areas, such as chemical analysis for pre-concentration, extraction processes, hydrometallurgy, and separating acids from their salts [14,15], radioactive-flow deacidification, the removal of copper and zinc using commercial cationic membranes, the removal of inorganic anions such as fluoride, nitrate, bromate, and borate from drinking water, and the removal of Cr(VI) ions using commercial anion-exchange membranes such as SB-6470, AFN, ACM, and Raipore 1030 [16]. The efficiency of the process depends on selecting a suitable functional work membrane.…”

Section: Introductionmentioning

confidence: 99%

Ion-selective interpenetrating polymer networks supported inside polypropylene microporous membranes for the removal of chromium ions from aqueous media

2015

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The ion-exchange properties of interpenetrating polymer networks (IPNs) have been studied to provide metal-ion transport with high selectivity. Polypropylene (PP) membranes incorporating poly [(ar-vinylbenzyl) trimethylammonium chloride], P(ClVBTA), poly[2-(acryloyloxy)ethyl]trimethylammonium chloride] P(ClAETA), poly(acrylic acid) P(AA), poly(2-acrylamidoglycolic acid) P(AGA), poly(glycidylmethacrylate-N-methyl-D-glucamine) P(GMA-NMG), poly(2-acrylamido-2-methyl-1-propane sulfonic acid) P(AMPS), and poly[sodium (styrene sulfonate)], P(SSNa) were modified via an ''in situ'' radical-polymerization. The surface of PP was activated by a hydrophilic grafted polyelectrolyte and then pressure injection was used for impregnation of the reactive solution in the membrane. The following conditions were varied: the functional monomer, grafted polyelectrolyte, and cross-linked concentration. The modified PP membranes were characterized using SEM/EDS, FT-IR, electrokinetic potential, and Donnan dialysis for the chromium ion transport. The modified membranes exhibited hydrophilic character with a water-uptake capacity between 15 and 40 % and a percentage of modification between 2.5 and 5.5 % in comparison with the behavior of the unmodified polypropylene membrane as the blank probe. Hexavalent chromium ions were efficiently transported by the modified membranes containing P(ClVBTA) (61.2 %) and only 5.8 % of trivalent chromium were extracted at pH 3.0 using a 1 mol/L NaCl solution as the extraction reagent. Similarly, Cr(III) transport using membranes modified with P(SSNa) achieved 42.1 % extraction at pH 3.0 using 1 mol/L NaCl as the extraction reagent and 2.5 % extraction was achieved for Cr(VI). Unmodified PP membrane shows Cr(VI) extraction percentage between 1.6 and 3.1 %, and Cr(III)extraction percentage between 2.3 and 2.6 %.

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Section: Introductionmentioning

confidence: 99%

Ion-selective interpenetrating polymer networks supported inside polypropylene microporous membranes for the removal of chromium ions from aqueous media

2015

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“…Meanwhile, because electrical neutrality needs to be preserved, some co-ions with small hydration radius and little charge can always have high mobility and transport through the membrane, which makes DD process fulfilled [1,2]. The DD technique has been applied as an industrial membrane process ever since 1984 [3]. Up to now, it has been successfully exploited to recover acids and valuable metals from waste solution generated in the steel, metal-refining, electroplating, cation exchange resin regeneration, and non-ferrous metal smelting industries [4,5].…”

Section: Introductionmentioning

confidence: 99%

Diffusion dialysis of hydrochloride acid at different temperatures using PPO–SiO2 hybrid anion exchange membranes

Luo

et al. 2010

Journal of Membrane Science

163

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“…Moreover, papers on the separation of mixtures containing carboxylic acids and carboxylates have also been published [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, two types of equip-ment are used: a two-compartment mixed cell [4][5][6][7][8][9][10] and a continuous dialyzer [8,[11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Determination of Diffusivity From Steady‐state Mass Transfer Measurements in a Continuous Dialyzer Under Conditions of Non‐zero Solution Flux Through a Membrane

Palatý¹,

Bendová²

2009

Chem Eng & Technol

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The transport of selected inorganic acids (HCl, H 3 PO 4 ) through an anion-exchange membrane, Neosepta-AFN, was investigated in a two-compartment counter-current continuous dialyzer with single passes at steady state. The basic data obtained were completed by the measurement of sorption isotherms. The mass transfer rate of the individual acids was quantified by the diffusivity of acid in the membrane, which was determined from the acid concentrations in the streams entering and leaving the dialyzer. For this purpose, two ordinary differential equations describing the steady-state concentration profiles of acid in both the compartments of the dialyzer were numerically solved in connection with an optimizing procedure. In the mathematical model used, the mass transfer resistances in the liquid films on both sides of the membrane and the flux of solution through the membrane were taken into account. All the experiments, carried out at a constant temperature of 25°C with subsequent data treatment, revealed that the diffusivity of hydrochloric acid is about one order of magnitude higher than that of phosphoric acid. Moreover, regarding the dependence of the diffusivity of hydrochloric acid upon its concentration in the membrane, a maximum at an acid concentration of 0.622 kmol/m 3 can be identified, while the diffusivity of phosphoric acid remains practically constant.

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Separation of Carboxylic Acids from Carboxylates by Diffusion Dialysis

Cited by 28 publications

References 19 publications

Ion-selective interpenetrating polymer networks supported inside polypropylene microporous membranes for the removal of chromium ions from aqueous media

Ion-selective interpenetrating polymer networks supported inside polypropylene microporous membranes for the removal of chromium ions from aqueous media

Diffusion dialysis of hydrochloride acid at different temperatures using PPO–SiO2 hybrid anion exchange membranes

Determination of Diffusivity From Steady‐state Mass Transfer Measurements in a Continuous Dialyzer Under Conditions of Non‐zero Solution Flux Through a Membrane

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