生物柴油制备中原料麻疯树籽油预酯化条件的研究

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。

Pre-esterification of Jatropha curcas L.seed oil for biodiesel production

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 H2SO4 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.