Regenerating sodium hydroxide from the spent caustic by bipolar membrane electrodialysis (BMED)

2012 ◽  
Vol 86 ◽  
pp. 49-54 ◽  
Author(s):  
Yanxin Wei ◽  
Chuanrun Li ◽  
Yaoming Wang ◽  
Xu Zhang ◽  
Qiuhua Li ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Bipolar Membrane ◽  
Bipolar Membrane Electrodialysis ◽  
Spent Caustic

scholarly journals Treating kraft mill extract using bipolar membrane electrodialysis for the production of acetic acid

TAPPI Journal ◽  
2016 ◽  
Vol 15 (3) ◽  
pp. 215-226 ◽  
Author(s):  
RAVIKAT PATIL ◽  
JOSEPH GENCO ◽  
HEMANT PENDSE ◽  
ADRIAAN VAN HEININGEN
Keyword(s):  
Acetic Acid ◽  
Energy Consumption ◽  
Sodium Hydroxide ◽  
Current Density ◽  
Salt Solution ◽  
Sodium Acetate ◽  
Process Conditions ◽  
Sodium Acetate Solution ◽  
Bipolar Membrane ◽  
Bipolar Membrane Electrodialysis

The objective of this work was to determine the process conditions for converting sodium acetate, the major component of alkaline hardwood extract, into acetic acid and sodium hydroxide using bipolar membrane electrodialysis (BPMED). The effects of current density and sodium acetate concentration in the feed-salt solution were evaluated using synthetic sodium acetate solution in a feed and bleed mode. This mode of operation represents semibatch processing and was useful for determining the current efficiencies, energy consumption, and other system parameters for the production of about 160 g/L of acetic acid; maximum achievable concentration of acetic acid in electrodialysis; and 30 g/L of sodium hydroxide, which is the concentration sufficient for the extraction of sodium acetate from hardwood. The feed and bleed mode experiments performed at 60 mA/cm2 using 130 and 85 g/L sodium acetate as feed-salt solutions produced similar results, except for a small change in the amount of water transported into the acid and base compartments. The feed and bleed mode experiment performed at low current density of 40 mA/cm2 using 50 g/L sodium acetate as feed-salt solution produced almost similar quantities of acetic acid and sodium hydroxide as those in the other feed and bleed mode experiments. However, the energy consumption and current efficiencies were lower than those for the experiments performed at the current density of 60 mA/cm2.

Regeneration of hydrochloric acid and sodium hydroxide with bipolar membrane electrodialysis from pure sodium chloride

1998 ◽  
Vol 22 (4) ◽  
pp. 355-361 ◽  
Author(s):  
Soraya Mazrou ◽  
Hassan Kerdjoudj ◽  
Ahmed T. Che´rif ◽  
Azzedine Elmidaoui ◽  
Jean Mole´nat
Keyword(s):  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Sodium Hydroxide ◽  
Bipolar Membrane ◽  
Bipolar Membrane Electrodialysis

Hydrofluoric acid and sodium hydroxide production by bipolar membrane electrodialysis

2015 ◽  
Vol 57 (43) ◽  
pp. 20254-20260 ◽  
Author(s):  
J. Erkmen ◽  
S. Yapıcı ◽  
M.E. Arzutuğ ◽  
Ö. Aydın ◽  
O.N. Ata ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Hydrofluoric Acid ◽  
Bipolar Membrane ◽  
Bipolar Membrane Electrodialysis

scholarly journals Recovery of Acid and Base from Sodium Sulfate Containing Lithium Carbonate Using Bipolar Membrane Electrodialysis

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 152
Author(s):  
Wenjie Gao ◽  
Qinxiang Fang ◽  
Haiyang Yan ◽  
Xinlai Wei ◽  
Ke Wu
Keyword(s):  
Sulfuric Acid ◽  
Sodium Hydroxide ◽  
Sodium Sulfate ◽  
Lithium Carbonate ◽  
Environmental Benefits ◽  
Raw Material ◽  
Process Conditions ◽  
Bipolar Membrane ◽  
Experimental Conditions ◽  
Bipolar Membrane Electrodialysis

Lithium carbonate is an important chemical raw material that is widely used in many contexts. The preparation of lithium carbonate by acid roasting is limited due to the large amounts of low-value sodium sulfate waste salts that result. In this research, bipolar membrane electrodialysis (BMED) technology was developed to treat waste sodium sulfate containing lithium carbonate for conversion of low-value sodium sulfate into high-value sulfuric acid and sodium hydroxide. Both can be used as raw materials in upstream processes. In order to verify the feasibility of the method, the effects of the feed salt concentration, current density, flow rate, and volume ratio on the desalination performance were determined. The conversion rate of sodium sulfate was close to 100%. The energy consumption obtained under the best experimental conditions was 1.4 kWh·kg−1. The purity of the obtained sulfuric acid and sodium hydroxide products reached 98.32% and 98.23%, respectively. Calculated under the best process conditions, the total process cost of BMED was estimated to be USD 0.705 kg−1 Na2SO4, which is considered low and provides an indication of the potential economic and environmental benefits of using applying this technology.

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