从生物柴油副产物中提纯甘油的预处理实验  

PRETREATMENT OF PURIFYING GLYCROL FROM BIODIESEL CO-PRODUCTION BY ACIDIFICATION AND FLOCCULATION

作　　者：王治敏[1] 陆向红[1] 胡立松[1] 计建炳[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,杭州310014

出　　处：《太阳能学报》2013年第8期1458-1463,共6页Acta Energiae Solaris Sinica

基　　金：浙江省重大科技专项(2006C11015)

摘　　要：建立一条酸化破乳、絮凝脱胶从生物柴油下层副产物中纯化甘油的预处理工艺。以甘油含量为31.4%的生物柴油下层副产物为原料,进行酸化破乳脱杂实验,考查甲醇用量、酸种类和溶液pH值对脱盐量、甘油的纯度及收率的影响,结果显示:在甘油原料中加入等体积的甲醇作为稀释剂,以浓磷酸为酸度调节剂,pH值为4.5时,甘油纯化效果较好,脱盐量达到0.139g固体杂质/(g甘油原料)、得到的粗产品中甘油含量达85.3%。以酸化破乳处理后得到的粗甘油为原料进行絮凝脱胶实验,考查絮凝剂种类、pH值以及絮凝剂用量对甘油纯度和收率的影响,结果显示:选用2%的明矾水溶液作为絮凝剂,用浓磷酸调节溶液pH至4.5时,絮凝脱胶效果最好,此时甘油产品的纯度为90.5%,收率为98.6%。甘油含量仅为31.4%的粗甘油原料(生物柴油下层副产物),经酸化破乳、絮凝脱胶处理后,可得到甘油含量为90.0%的粗甘油产品,整个预处理工艺的甘油收率超过95%。A pretreatment process to purify glycerol from biodiesel co-product was studied. The pretreatment process was made up of acidification and flocculation. The impurities, such asl fatty acid, fame and salt could be removed by acidification. 0. 139g solid impurities could be removed from lg raw material, and the crude glycerol with purity of 85.3 % could be obtained when adding methanol with equal volume of raw material as diluent, using strong phosphate to adjust pH = 4. 5. The colloidal impurities could be removed by flocculation. The glycerol yield of 98. 6e with purity of 90. 5% could be recycled from the obtained glycerol when adding 2% alum aqueous solution, and using strong phosphate to adjust pH =4. 5. The glycerol yield of 95% with purity of 90% could be recovered from biodiesel co-product with 31.4% glycerol by the pretreatment process.

关 键 词：甘油 生物柴油 酸化破乳 絮凝脱胶 

分 类 号：TQ645.5[化学工程—精细化工]