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Hydroxide and Carbonate in Unpurified Brine

The EZ-Clarifier® on-line analyzer system monitors levels of sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) in the precipitation process of the primary brine purification. Controlling these levels guarantees low levels of impurities upstream and optimum control of brine purity.

Prior to analysis, a proprietary preconditioning system samples brine in the Imhoff type settling cone of the EZ-Settler®, a small sized precipitation clarifier. After an accelerated precipitation only the top fraction is used for analysis. The complete preconditioning system is controlled by AppliTek’s proprietary controller-database software of the analyzer’s industrial panel PC.


Chlorine is produced by electrolysis of brine. Most commercial salts, such as sodium or potassium chloride, contain many calcium and magnesium impurities that need be controlled during operation. The challenge in the operation of today’s production plants is to minimize the amount of soda ash and caustic soda used for precipitation. The EZ-Clarifier® on-line analyzer system not only monitors this important preparatory step, it also controls upstream brine purity by guaranteeing low levels of impurities for the second step of the purification, the ion-exchange process.

Guarantees brine purity to assure proper membrane operation

Controls the precipitation process to reduce the amount of soda ash (NaOH / Na2CO3) dosed

Limits your chemical dosing to a minimum

Typical measuring ranges    
0.05 – 1 g/L NaOH
0.05 – 1.5 g/L Na2CO3

Analysis method  
Acid-base titration using HCl (pH self-finding inflection points for NaOH and Na2CO3)

Detection limit    

Cycle time  
25 minutes incl. sample preconditioning

Better than ± 2 % full scale range(standard test solutions)

Product type: Process analyzers

Measuring technology: Titration

Type of application process: Brine preparation

Industries: Chlor-alkali