文冠果油生物柴油副产物粗甘油的精制

摘要

文冠果油生物柴油副产物粗甘油中不仅含有甘油,还含有皂类、水分、甲醇和酯类物质等,其甘油含量在30％ ～60％.通过皂化、酸化、极性试剂萃取和活性炭吸附的方法对文冠果油生物柴油副产物粗甘油进行连续精制.结果表明,粗甘油经氢氧化钾甲醇溶液皂化,再用H3PO4调pH至2.5酸化,甲醇和粗甘油体积比为4:1萃取,100 g/L活性炭吸附脱色处理后,可以得到纯度为98.5％的精制甘油.%The by - product of crude glycerol produced by transesterification of Xanthoceras sorbiflia Bunge seed oil biodiesel, contained soaps, methanol, water and esters, and the content of glycerol was 30% - 60%. The crude glycerol was refined by saponification, acidification, polar solvent extraction and activated carbon adsorption. The results showed that the highest glycerol purity of 98. 5% was obtained by saponification with KOH - CH3OH solution, acidification at pH 2.5 adjusted with H3PO4,extraction with volume ratio of methanol to crude glycerol 4:1 and adsorption with activated carbon at 100 g/L.