Solvent extraction process of oryzanol

A method of extractingoryzanolby a solvent method. First, preheat the crude rice bran oil, refine physically the pretreated bran oil to remove free fatty acid, add basic methanol into the refined bran oil and refluently extract continuously, adding acid into the mother methanol liquid, crystallizing oryzanol, after separation, obtain oryzanol. The production rate of refined oil could improve from 50í½55úÑ to 60í½65úÑ, that of oryzanol could improve from 35í½40úÑ to 60í½70úÑ. In the invention, the amount of methanol is reduced, no lipidal matters are discharged. 本发明涉及一种溶剂法萃取谷维素的生产方法，首先对米糠毛油进行预处理，对预处理后的糠油进行物理精炼以脱除油中游离脂肪酸，在精炼后的糠油中加入碱性甲醇进行连续逆流萃取，向萃取后的甲醇母液中加酸使其中所含的谷维素结晶析出，分离后得谷维素。采用本发明精油得率可由原来的50～55％提高到60～65％，谷维素的得率由原来的35～40％提高到60～70％。同时本发明可减少甲醇用量，并不会有碱炼油脚产生，谷维素萃取也没有类脂物和黑脂酸排出，基本上不会对环境造成污染。