KOH is also known as potash, a strong alkaline chemical raw material. It is often used to make potassium carbonate, soft soap, detergent and pigment, etc. It is also used in electroplating, alkaline electrolyte battery and so on. Let's talk about the product.
Solid potassium hydroxide is a white orthogonal crystal that deliquesces easily and absorbs carbon dioxide. Soluble in water releases a lot of heat, soluble in alcohol and glycerin. Melting point ℃。 Its chemical properties are similar to sodium hydroxide （caustic soda）， aqueous solution is strongly alkaline, can destroy cell tissue.
Hydrates with 1, 2, 4 molecules of water. When solid potassium hydroxide encounters water or steam, it will generate heat and make flammable substances reach combustion temperature. Therefore, it should be stored in a dry place. Protective measures for contact with potassium hydroxide are the same as sodium hydroxide.
Potassium hydroxide can be prepared by electrolysis of a highly purified aqueous solution of potassium chloride. The electrolytic cell used and its production process are similar to sodium hydroxide. When a diaphragm cell is used, the resulting electrolyte contains 10% ~ 15% （mass） potassium hydroxide and approximately 10% （mass） potassium chloride.
After evaporation, concentration and cooling, most of the potassium chloride crystallizes out, and after separation, the product containing 45% ~ 50% potassium hydroxide （containing % potassium chloride） is obtained.
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, so as not to contain too much hydrogen in chlorine gas. Ionic membrane electrolysis requires the use of a special ion exchange membrane.
Potassium hydroxide is more difficult to dehydrate than sodium hydroxide. The purity of industrial solid potassium hydroxide is 88% ~ 92%, and there are two kinds of solid: block and flake. Liquid potassium hydroxide is available in 45% and 50% concentration specifications.
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