Potassium hydroxide can be prepared by electrolysis of high-purity potassium chloride aqueous solution. The type of electrolytic cell used and the production process are similar to sodium hydroxide. When diaphragm electrolyzer is used, the electrolyte obtained contains 10%~15% (mass) potassium hydroxide and about 10% (mass) potassium chloride.
After evaporation, concentration and cooling, most potassium chloride crystals are separated, and the product containing 45%~50% potassium hydroxide (containing 0.6% potassium chloride) is obtained after separation. High purity potassium hydroxide can be prepared by mercury electrolysis, but the content of heavy metal impurities in potassium chloride aqueous solution should be controlled below 0.1 ppm to avoid excessive hydrogen content in chlorine.
Ion exchange membrane shall be used for ion-exchange membrane electrolysis. Potassium hydroxide is harder to dehydrate than sodium hydroxide. The purity of industrial solid potassium hydroxide is 88%~92%. There are two kinds of solid: blocky and flaky. There are two concentration specifications of liquid potassium hydroxide: 45% and 50%.
Inorganic industry is used as raw materials for the production of potassium salts, such as potassium permanganate, potassium nitrite, potassium hydrogen phosphate, etc. The daily chemical industry is used as the raw material for manufacturing potassium soap, dirt washing soap, shampoo, cream, cold cream, shampoo, etc. The pharmaceutical industry is used to manufacture such raw materials as progesterone and vanillin.
The dye industry is used to make melamine dyes. The battery industry is used to manufacture alkaline storage ground. Used as saponification reagent, absorbent of carbon dioxide and water, analytical reagent and alkaline agent; It can be used as product chromogenic agent, metallurgical heating agent, leather degreasing, etc; It is used as desiccant, absorbent, electroplating, carving, lithography, etc.
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