Sodium stearate is a white powder in appearance, with a fatty smell and a greasy feel. It is soluble in hot water and ethanol, and decomposes into stearic acid and corresponding acids when exposed to acid. of sodium salt. Stable under normal temperature and pressure, avoid contact with oxides. It can be slowly dissolved in cold water and cold ethanol, and very easily soluble in hot water and hot ethanol.
Production method of sodium stearate:
1. Add stearic acid to the reaction kettle, heat until melted, then add NaOH while stirring The aqueous solution is heated at 65°C for 2 hours, the pH value is controlled at 8.0 to 8.5, and the product is obtained by spray drying.
2. Dissolve 10g stearic acid in 100mL 95% ethanol, titrate with 0.5mol/L sodium hydroxide ethanol solution, use phenolphthalein as indicator, titrate to the equivalence point, and remove the precipitated Sodium stearate soap is separated by suction filtration. The crude product can be recrystallized from 95% ethanol to obtain pure product.
Uses of sodium stearate:
1. Widely used in food, medicine, cosmetics, plastics, metal processing, metal cutting, etc., mainly used as emulsifier, dispersant, lubrication Agents, surface treatment agents, corrosion inhibitors, etc.
2. Used in the manufacture of toothpaste, and also used as a waterproofing agent and plastic stabilizer.
3. Used in the manufacture of soap detergents, used as both active agent and excipient in bar soap.
4. Used as an emulsifier for cosmetics and O/W products.
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