地沟油为原料制备的深色生物柴油的氧化法脱色

使用双氧水氧化法对地沟油为原料制备的深色生物柴油进行脱色。研究了双氧水用量、温度、反应时间等操作条件对深色生物柴油脱色效果的影响，并对脱色前后生物柴油的一些理化性质进行分析。研究表明：深色生物柴油中加入质量为油重15%的双氧水（质量分数30%），温度90℃，搅拌反应30min，脱色率可以达到82.2%。脱色处理后的生物柴油甲酯含量升高；酸值、水含量略有升高；甘油含量降低；密度、冷滤点、闪点等理化性质无明显变化。双氧水氧化法为一种可行的深色生物柴油脱色方法。

Bleaching of deep color biodiesel made from waste cooking oils by oxidation

Biodiesel produced from waste cooking oils always had deep color base on physical and chemical char-acteristic of the feedstock. This article used hydrogen peroxide to bleach the deep color biodiesel. The effects of hydrogen peroxide content, temperature, reaction time were investigated. Result showed the optimal conditions were: 15% hydrogen peroxide based on the oil weight, temperature 90 ℃, reaction time 30 min with stirring and the bleaching efficiency can reach to 82.2%. The content of fatty acid methyl esters (FAMEs) in the bleached biodiesel was higher than before; the acid value and wator content were also a little higher; while the total glycerin decreased; The density, viscosity at 40 ℃, carbon residue, flash point, heating power had no re-markable change. Bleaching of deep color biodiesel by oxidation could be utilized as an feasible and effective method.