At present, potassium hydroxide mainly uses the processes of ionic membrane method and diaphragm method, and the processes of each process are different. Let's take a look at the differences between these two methods in brine treatment process with Xiaobian.
In the ion-exchange membrane process, there will be excessive sulfate accumulation in the brine system due to process problems. Generally speaking, after a cycle of brine system, the sulfate accumulation can be about 13.5kg/t100% NaOH, which will affect the effect of finished products, so sulfate needs to be removed. There are many removal methods, but no matter what method is used, there will be these problems in use. One is that it will be difficult to refine the brine, and the cost of brine refining is relatively high, which may even lead to the secondary pollution of the brine, and the excess waste also needs to be treated.
The pure diaphragm method does not have the problem of sulfate accumulation, so it is not necessary to treat sulfate in the process of brine treatment. This potassium hydroxide process does not have very high requirements for brine. Even in many areas rich in underground salt mines in China, this method can use a large amount of brine or even total brine to make alkali, which can make good use of the local resource advantages. Moreover, the cost of this method is relatively low, and the economic benefit is relatively good for enterprises.
The above describes the difference between the brine treatment process of the ion-exchange membrane method and the diaphragm method used in potassium hydroxide. After reading, we can understand that the use effects of these two methods are relatively good, but compared with the diaphragm method, the effect is better, and the effect is relatively good in terms of cost and so on.