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CAS : 57-11-4
formula : C18H36O2
molecular weight : 284.48
boiling point : 361 ° C
melting point : 67-69 ° C
Chinese name : stearic acid; 18 Acid; 18 acid; 18 carbon Acid
English title : Stearic acid; Octadecanoic acid; 1-heptadecanecarboxylic acid; acide octadecylique; acide stearique
b> _b> traits Description : of 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.
production methods : stearate is widely nature the existence of a fatty acid, almost all oils have varying concentrations of stearic acid, animal fats in the higher levels, such as butter contents up to 24%, vegetable oil content less tea oil 0.8%, palm oil to 6%, but the cocoa butter content is as high as 34%.
industrial production methods are mainly fractionation law and crushing French. in addition hardening oil decomposition agent, and then in rough fatty acid hydrolysis, then washed, distillation, that is, in bleaching products. while Vice-glycerol .
purposes : for 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, suppository, it is still 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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