Does liquid caustic produced by the diaphragm process contain less sodium chlorate than that produced by the ion-exchange membrane process?
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Our company’s products require the use of large amounts of liquid sodium hydroxide during production. At present, we use liquid caustic produced by the ion-exchange membrane method. The manufacturer states that the allowable residual level of sodium chlorate is below 10 ppm; in reality, however, this level is between 2 and 3 ppm. Such residues have a serious impact on the quality of the products, and it is not possible to remove them. I wonder whether liquid caustic produced by the diaphragm method contains sodium chlorate? Or could the content be reduced a bit? Could you also recommend some companies that produce and sell liquid caustic using the diaphragm process? Thank you!
The alkali used in the diaphragm method contains high levels of chlorates and a very high salt content
The ion-exchange membrane process for producing caustic soda is more advanced than the diaphragm process, with lower levels of various impurities; as a result, caustic soda produced by the diaphragm process contains higher levels of sodium chlorate
Does the causticization method involve no chlorates? Are there still manufacturers in China that use this method to produce alkali?
Do you know how to remove sodium chlorate from caustic soda? Are there any manufacturers in China that still produce caustic soda using the caustication method?
The causticization method has been phased out. Removing sodium chlorate from caustic soda—this is unclear. Furthermore, this content is extremely low
In caustic soda, sodium chlorate is difficult to remove by conventional chemical methods, other than at the source (through sulfate backflow and control of sodium chlorate in brine). It is recommended that the original poster consult companies specializing in bipolar membrane electrodialysis technology; they should have ways to decompose trace amounts of chlorates using electrolysis.