Abstract
The sulfate soap is refined through extracting unsaponifiable neutral substance using ethyl acetate and hexane-acetone. The content of neutral substance in tall oil decreases from 32.8% to 17.4% and 18%. The acid number of tall oil increases from 119 to 169 and 153. The quality of tall oil is greatly improved. This provides a favorable condition for distillation of tall oil. The unsaponifiablc neutral substance from crude sulfate soap mainly consists of terpene aldehydes, terpene alcohols, fatty alcohols and sterols in which larixol is 26.3% and 18. 5%, sterols are 17% and 27.1% separately. The white crystals containing sterols of 96.9% are obtained by crystallization and recrystallization. The sterols are mainly β-sitosterol and campesterol.
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