Online analysis of the excess alkali content in brine

In ion-exchange membrane caustic soda, it is relatively difficult to analyze the excess alkali content in the primary brine on-line. The titration method is the most accurate way for determining alkalinity. To remove calcium and magnesium ions from the primary brine, sodium carbonate and sodium hydroxide are used together to form calcium carbonate and magnesium hydroxide precipitates. During this reaction process, the system functions like a buffer system; therefore, it is not convenient to measure the pH value alone. Meanwhile, on-line titration for detection is quite complex and difficult to maintain. Furthermore, high salt concentrations also restrict sampling and sample transfer in online analyzers; as a result, online analysis is rather difficult, and the cost of such analyzers is very high. Some instruments use colorimetry, but due to the buffering properties of the system, the reliability of this method may be limited; furthermore, free chlorine in saline water may also affect the chromogenic reagent. If the original poster needs information in this area, they can contact me.

An online pH meter can detect the level of excess alkali, but there is too much salt crystal formation

I work for Swagelok, and we offer excellent online analysis solutions for alkali content in the chlor-alkali industry. Our current clients include Shanghai Chlor-Alkali, Chongqing Yingtianhui, Qingdao Haijing, BASF, and others. If you need more details, you can contact me at: 18017436160. We have also carried out a lot of online calcium and magnesium analysis for secondary brine in the chlor-alkali industry; currently, around 20 companies are using this service.

Could you provide samples of your company’s products, or some informational materials? Since your company has such a product, could you introduce it to us?

Which manufacturers produce domestic online analyzers for excess alkali content? Could everyone please let me know