Application of heterogeneous ion exchange membranes for simultaneous separation and recovery of lithium and boron from aqueous solution with bipolar membrane electrodialysis (EDBM)

This study describes the use of poly(phenylene oxide) polymer-based ion-exchange polymers, polystyrene-based ion-exchange particles and a porous support for fabricating bipolar membranes and the results of an assessment of the applicability of these materials to water splitting. In order to achieve good mechanical as well as good ion-exchange properties, bipolar membranes were prepared by laminating poly(phenylene oxide) and polystyrene based ion-exchange membranes with a sulfonated polystyrene-block-(ethylene-ran-butylene)-block-polystyrene) (S-SEBS) modified interface. PE pore-supported ion-exchange membranes were also used as bipolar membranes. The tensile strength was 13.21 MPa for the bipolar membrane which utilized only a cation/anion-exchange membrane. When ion-exchange nanoparticles were introduced for high efficiency, a reduction in the tensile strength to 6.81 MPa was observed. At the same time, bipolar membrane in the form of a composite membrane using PE support exhibited the best tensile strength of 32.41 MPa. To confirm the water-splitting performance, an important factor for a bipolar membrane, pH changes over a period of 20 min were also studied. During water slitting using CA-P-PE-BPM, the pH at the CEM part and the AEM part changed from 5.4 to 4.18 and from 5.4 to 5.63, respectively.

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The Application of Electrochemical Technology in the Production of Ethylenediamine

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.685.731 ◽

2016 ◽

Vol 685 ◽

pp. 731-734

Author(s):

N.A. Bykovsky ◽

L.N. Puchkova ◽

N.N. Fanakova

Keyword(s):

Aqueous Solution ◽

Ion Exchange ◽

Light Fraction ◽

Ion Exchange Membranes ◽

Electrochemical Technology ◽

Initial Stage

The processing of the light fraction formed during the separation of amines for components by rectification is investigated. The light fraction which is an aqueous solution with about 1% of ethylenediamine and 2% of ammonia is treated in an electrolyzer with ion-exchange membranes. It is shown that a concentrated product containing about 118 g/l of ethylenediamine, about 106 g/l of ammonia and purified water can be obtained in this case. The concentrated product can be used at the initial stage of amines production.

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Ion-exchange membranes in chemical synthesis – a review

Open Chemistry ◽

10.1515/chem-2016-0002 ◽

2016 ◽

Vol 14 (1) ◽

pp. 1-19 ◽

Cited By ~ 23

Author(s):

Hanna Jaroszek ◽

Piotr Dydo

Keyword(s):

Ion Exchange ◽

Chemical Synthesis ◽

Synthesis Methods ◽

Ion Exchange Membranes ◽

Bipolar Membrane ◽

Acid Base ◽

Membrane Electrolysis ◽

Recovery Processes ◽

Ion Substitution

AbstractThe applicability of ion-exchange membranes (IEMs) in chemical synthesis was discussed based on the existing literature. At first, a brief description of properties and structures of commercially available ion-exchange membranes was provided. Then, the IEM-based synthesis methods reported in the literature were summarized, and areas of their application were discussed. The methods in question, namely: membrane electrolysis, electro-electrodialysis, electrodialysis metathesis, ion-substitution electrodialysis and electrodialysis with bipolar membrane, were found to be applicable for a number of organic and inorganic syntheses and acid/base production or recovery processes, which can be conducted in aqueous and non-aqueous solvents. The number and the quality of the scientific reports found indicate a great potential for IEMs in chemical synthesis.

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Production of Acids and Bases for Ion Exchange Regeneration from Dilute Salt Solutions Using Bipolar Membrane Electrodialysis

ACS Sustainable Chemistry & Engineering ◽

10.1021/acssuschemeng.5b00654 ◽

2015 ◽

Vol 3 (9) ◽

pp. 2337-2342 ◽

Cited By ~ 33

Author(s):

Jake R. Davis ◽

Yingying Chen ◽

James C. Baygents ◽

James Farrell

Keyword(s):

Ion Exchange ◽

Salt Solutions ◽

Bipolar Membrane ◽

Bipolar Membrane Electrodialysis ◽

Acids And Bases

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Bipolar Membrane Electrodialysis for Sulfate Recycling in the Metallurgical Industries

Membranes ◽

10.3390/membranes11090718 ◽

2021 ◽

Vol 11 (9) ◽

pp. 718

Author(s):

Kuldeep ◽

Wouter Dirk Badenhorst ◽

Pertti Kauranen ◽

Heikki Pajari ◽

Ronja Ruismäki ◽

...

Keyword(s):

Ion Exchange ◽

Current Efficiency ◽

Environmental Sustainability ◽

Exchange Capacity ◽

Effect Of Temperature ◽

Bipolar Membrane ◽

Cobalt Sulfate ◽

Payback Time ◽

Bipolar Membrane Electrodialysis ◽

Waste Effluents

Demand for nickel and cobalt sulfate is expected to increase due to the rapidly growing Li-battery industry needed for the electrification of automobiles. This has led to an increase in the production of sodium sulfate as a waste effluent that needs to be processed to meet discharge guidelines. Using bipolar membrane electrodialysis (BPED), acids and bases can be effectively produced from corresponding salts found in these waste effluents. However, the efficiency and environmental sustainability of the overall BPED process depends upon several factors, including the properties of the ion exchange membranes employed, effluent type, and temperature which affects the viscosity and conductivity of feed effluent, and the overpotentials. This work focuses on the recycling of Na2SO4 rich waste effluent, through a feed and bleed BPED process. A high ion-exchange capacity and ionic conductivity with excellent stability up to 41 °C is observed during the proposed BPED process, with this temperature increase also leading to improved current efficiency. Five and ten repeating units were tested to determine the effect on BPED stack performance, as well as the effect of temperature and current density on the stack voltage and current efficiency. Furthermore, the concentration and maximum purity (>96.5%) of the products were determined. Using the experimental data, both the capital expense (CAPEX) and operating expense (OPEX) for a theoretical plant capacity of 100 m3 h−1 of Na2SO4 at 110 g L−1 was calculated, yielding CAPEX values of 20 M EUR, and OPEX at 14.2 M EUR/year with a payback time of 11 years, however, the payback time is sensitive to chemical and electricity prices.

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