甘油是生物柴油生产过程中的主要副产物。生物柴油中甘油含量多少是评价生物柴油质量好坏的重要指标之一。通过水洗可以很容易去除粗生物柴油中的游离甘油,采用单因素试验研究影响水洗脱除甘油的因素,再用正交法优化工艺条件。结果表明:水洗脱除甘油的最优条件为:水洗温度40℃、水洗次数4次、搅拌时间25min、搅拌速度250r/min,此时的甘油脱出率85.49%。生物柴油经最佳工艺条件水洗,其甘油残留量为0.0065%,符合美国ASTMD6751-02的标准规定。 Glycerin is the major by-product of biodiesel production. Biodiesel glycerol content is how much to evaluate the quality of biodiesel is one of the important indicators. The free glycerol in crude biodiesel can be easily removed by washing. The factors affecting the removal of glycerol by water washing are studied by single factor experiment, and the process conditions are optimized by orthogonal test. The results showed that the optimum conditions for the removal of glycerol were: washing temperature 40 ℃, washing times 4 times, stirring time 25min, stirring speed 250r / min, glycerol extraction rate 85.49% at this time. Biodiesel was washed by the best technological conditions, the residual glycerol was 0.0065%, in line with the United States ASTMD6751-02 standard requirements.