In the chemical industry, the common methods of potassium hydroxide production are diaphragm electrolysis, mercury, and ion-exchange membrane electrolysis. For example, when we choose mercury electrolysis production, the risk is relatively high, because Mercury is a heavy metal, which has a lot of toxicity, so we must correctly regulate the operation. The following small edition will introduce the production process of electrolytic mercury potassium hydroxide, as follows.
(1) purification of potassium chloride solution:
Melt the potassium chloride in the salt bath of the raw material, add the potassium carbide and barium chloride to remove the impurities, such as calcium, magnesium and sulfuric acid, then enter the settler, the upper clear liquid overflows, and use the sand filter to filter the slightly suspended solid neutralization tank, acidify the hydrochloric acid into the salt storage tank, pump the salt water pre heating equipment to play the role of high salt water tank and the mercury after the salt water enters the electrolytic tank. Clear the salt mud at the bottom of the tank, filter and recycle the salt water.
The mercury cell is divided into two parts: electrolysis chamber and pump chamber. In the cell, graphite or metal is used as the positive electrode and mercury as the negative electrode. The chlorine generated after power on is sent to the chlorine drying process. Most unreacted potassium chloride is treated in fresh brine: return to brine process. In the extraction chamber, the potassium pump reacts with the water at the end to form potassium hydroxide solution and flows into the electrolyte storage tank. The hydrogen produced by the hydrogen extraction chamber is sent to the hydrogen station.
(3) solid foundation:
The alkaline solution containing 45-50% KOH produced by the electrolysis pump house of the mercury cell is boiled to produce solid alkali or the product is produced by the film-forming mechanism.
The above-mentioned electrolytic mercury method can generally produce liquid alkali and solid alkali, which are two forms of potassium hydroxide products. They can be used and sold, and their benefits will be higher, so now they are also more frequently used. For the selection of different production methods, we can comprehensively consider the quality of finished products, production costs, equipment costs and other aspects, and hope you can understand.