摘要
生物柴油一般是通过天然油脂经过碱催化酯交换反应制得。以攀枝花地区的麻疯树籽油为原料,研究了KOH催化酯交换过程对原料油酸值的要求,以及麻疯树籽油性质对浓硫酸催化预酯化过程的适应性。研究发现,KOH催化酯交换过程中,原料油的酸值应控制在1.5 mgKOH/g以下以避免引起产品皂化;预酯化过程中,用油重1%的浓硫酸催化,当甲醇用量为油重12%时,原料油的酸值应小于20 mgKOH/g;随着原料中水分含量的增加,预酯化转化率下降;磷脂含量对于预酯化转化率影响不大,但应在1%以下才能便于后续分离。
Biodiesel is commercially produced by the transesterification of vegetable oils and animal fats with methanol in the presence of alkaline-catalyst. Jatropha curcas L. seed oil from Panzhihua area was converted to biodiesel by pre-esterification catalyzed by H^O4 and transester-ification catalyzed by KOH. The results show that the transesterification reaction require the acid value of Jatropha curcas L. seed oil below 1.5 mgKOH/g due to the saponification of FFA with KOH catalyst. Pre-esterification with 12% methanol and 1% H2SO4 as catalyst can reduce the acid value of Jatropha curcas L. seed oil from 20 mgKOH/g to 1.5 mgKOH/g. Moisture in oil greatly influence the pre-esterification, the conversion decreases rapidly with increasing moisture content. Although phospholipids, the normal impurities in crude oil, have little influence on the presteri-fication conversion, it is strongly suggested to control their content below 1% to prevent serious emulsification of products.
出处
《中国油脂》
CAS
CSCD
北大核心
2007年第7期43-46,共4页
China Oils and Fats
关键词
生物柴油
酯交换
麻疯树籽油
预酯化
游离脂肪酸
水分
磷脂
biodiesel
transesterification
Jattropha curcas L. seed oil
pre-esterification
free fatty acid
moisture
phospholipids
作者简介
刘颖颖（1983-），女，在读硕士；主要从事生物柴油方面的研究工作。通讯作者 副教授／博士
