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以高酸值餐饮废油为原料,以自制的酸性离子液体[SO3H-Bmim][HSO4]和氢氧化钠为催化剂,采用两步法催化制备生物柴油。利用正交表L25(56),选取4因素5水平对离子液体[SO3H-Bmim][HSO4]对降低餐饮废油酸值的催化活性进行正交实验,并研究了离子液体的重复使用性能。结果表明,离子液体[SO3H-Bmim][HSO4]对降低餐饮废油的酸值具有很强的催化活性,可重复使用4~5次。最佳降酸值条件:醇/油摩尔比8∶1,离子液体用量1.0%(质量分数),反应温度70℃,反应时间120 m in。在该条件下,餐饮废油的酸值从33.25降低到0.45 mgKOH/g。以氢氧化钠催化降低酸值后的餐饮废油,生物柴油产率可达96.4%。
A two-step catalytic preparation of biodiesel was carried out using high acid value food waste oil as raw material and self-made acidic ionic liquid [SO3H-Bmim] [HSO4] and sodium hydroxide as catalyst. The orthogonal experiment L25 (56) was used to determine the catalytic activity of [SO3H-Bmim] [HSO4] to reduce the acid value of food wastes at 4 factors and 5 levels. The reusability of ionic liquid was also studied. The results showed that the ionic liquid [SO3H-Bmim] [HSO4] had a strong catalytic activity for reducing the acid value of used cooking oil and could be reused for 4 to 5 times. The optimal conditions of acid value reduction were: alcohol / oil molar ratio 8:1, ionic liquid 1.0% (mass fraction), reaction temperature 70 ℃ and reaction time 120 mins. Under this condition, the acid value of the meal waste oil decreased from 33.25 to 0.45 mgKOH / g. With sodium hydroxide catalyst to reduce the acid value of the restaurant waste oil, biodiesel production rate of 96.4%.