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Molecular formula : C18H36O2
MW : No. 57-1 284.48
CAS-11-4
nature : for the pure white with a shiny blade-like solid. 69.6 ° C melting point, boiling point, 376.1 ° C (decomposition), 232 ° C (2.0kPa), relative density (20 / 4 ° C) 0.9408, 1.4299 refractive index (80 ° C). 90-100 ° C in slowly volatile. Almost do not dissolve in water (20 ° C, 100 ml of water 0.00029g only solution, dissolved in alcohol, acetone, soluble in ether, chloroform, benzene, carbon tetrachloride, carbon disulfide, amyl acetate and toluene. Commodities stearic acid is actually 45% and 55% stearic acid soft palmitic acid mixture, and contains a small amount of oleic acid and slightly fatty odor.
Preparation : stearic acid is the widespread nature of a fatty acid, almost all oils have varying concentrations of stearic acid, animal fats in the higher levels, such as the contents of butter up to 24 % vegetable oil were less content, tea oil 0.8%, palm oil to 6%, but the cocoa butter content is as high as 34%. industrial production methods stearate main fractionator law and crushing French. in addition hardening oil decomposition agent, and then hydrolyzed in crude fatty acids, then washed, distillation, that is, in bleaching products. while Vice-glycerol.
purposes : as natural rubber, syntheic (except butyl rubber) and the vulcanized rubber latex active agent, is also used as a plasticizer and plastic stabilizer raw materials. Medicine for the preparation ointment, suppositories, etc. also used in the manufacture of cosmetics, candles, waterproof agent, polishes agents. the goods in the food industry for lubricants, defoamer and stearic acid glyceride food additives, stearic acid sorbitol anhydride ester, sucrose esters of raw materials.
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