Production of concentrated caustic soda and hydrochloride acid solutions from sodium chloride by electrodialysis with the aid of bipolar ion-exchange membranes

Journal Article · Thu Oct 20 04:00:00 EDT 1988 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6165416

Greben', V P; Pivovarov, N Ya; Latskov, V L

This paper gives a comparative analysis of the action of electrodialyzers containing three and five compartments in the structural unit, and equipped with bipolar, cation-exchange, and anion-exchange membranes, used for production of hydrochloric acid and caustic soda from sodium chloride solutions. It was shown that an electrodialyzer with five compartments gives hydrochloric acid and caustic soda for 2.5-3 M concentration with 0.2-0.3 current efficiency, whereas an electrodialyzer with three compartments in the structural unit gives hydrochloric acid and caustic soda concentrations of about 1.2 M at the same current efficiency. The performance of the electrodialyzers was analyzed and equations were derived for calculating the current efficiencies for acid and alkali under conditions of acidification of the salt solution; this was based on determination of the transport numbers of ions passing through the membranes.

• OSTI ID: 6165416
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 61:5; ISSN JAPUA
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
ACIDIFICATION
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
DIALYSIS
EFFICIENCY
ELECTROCHEMICAL CELLS
ELECTRODIALYSIS
ELECTROLYTES
ENERGY EFFICIENCY
FLUID FLOW
HALIDES
HALOGEN COMPOUNDS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
ION EXCHANGE
ION EXCHANGE MATERIALS
ION MOBILITY
LIQUID FLOW
MATERIALS
MATERIALS TESTING
MATHEMATICAL MODELS
MEMBRANES
MOBILITY
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
PARTICLE MOBILITY
PERFORMANCE
PRODUCTION
SEPARATION PROCESSES
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
TESTING