Caustic soda (sodium hydroxide) is an important basic material in the chemical industry and is mainly produced by the electrolysis of soda. There are two types of electrolysis processes: the diaphragm method and the ion-exchange membrane method; the latter is becoming mainstream because of its lower energy consumption and higher product quality. Both methods involve evaporating the solution after the electrolysis process to make concentrated caustic soda.

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Yokogawa offers a full spectrum of liquid analytical products from pH/ORP, conductivity, DO, turbidity and chlorine sensors and analyzers.

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