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APPLICATION NOTE Measurement of Concentration of Supersaturated NaCl Solution in Salt Dissolvers at Electrolysis Plants Industry: Chemical Product: Inductive conductivity analyzers Introduction Control of sodium chloride (NaCl) concentration at a salt dissolver where solid salt is dissolved in water, is highly important because of the electrolysis efficiency. A conventional way of measuring the concentration of supersaturated NaCl solution had been performed by using non-contact type sensors (e.g., g-ray density meter) since NaCl, impurities, and precipitates are in the solution. In this way, there were disadvantages such as troublesome maintenance and therefore, the radiation control is required fo g-ray density meter. Process Overview Responding to these backgrounds, the FLXA21 inductive conductivity analyzer provides concentration reading and realizes to improve substantial maintainability, cost performance and measurement accuracy. Expected Benefits – Measures NaCl concentration in salt dissolvers – Reduces operating costs In an electrolysis plant, the solid salt is dissolved in water in a salt dissolver to make brine. This brine contains impurities, such as calcium, magnesium or sulfates, that decrease electrolysis efficiency. The brine is purified by removing these impurities before being fed to an electrolyzer, where the purified brine is electrolyzed to produce caustic soda and chlorine. The caustic soda solution produced at the cathode in the electrolyzer is concentrated in a multiple effect evaporator, as a result the concentration is incresed from approximately 32% to 48%. Electric Power Semiconductor Rectifier Transformer Dechlorinator Weak Brine Chlorine Gas Hydrogen Gas : Measuring point Evaporator Concentrated Caustic Soda Liquid Caustic Soda ISC Analyzer Salt Purification Dissolver System (Secondary Purification) Ion Exchange Membrane Electrolyzer Distilled Water Solid Salt AN 10D01E01-01E http://www.yokogawa.com/an/index.htm All Rights Reserved, Copyright © 2006, Yokogawa Electric CorporationPDF Image | Supersaturated NaCl Sol Salt Dissolvers Electrolysis Plants
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