摘要
以废油脂为原料,采用两步法即先用氯化铁为催化剂催化废油脂中的游离脂肪酸和甲醇反应降低原料的酸值,然后分离出氯化铁并加入KOH催化生产生物柴油。第一步反应的最佳条件为:温度65℃,催化剂FeCl3用量2%,醇油摩尔比为11∶1,反应5 h;第二步反应条件是:在65℃下加入1%的KOH,醇油摩尔比为6∶1,反应时间为1 h,最终生物柴油的得率为93.6%。此方法相对传统的浓硫酸催化生产生物柴油具有反应迅速、转化率高,催化剂易于回收,不产生污染物等优点。
A two- step catalyzed method to produce biodiesel using waste cooking oil （WCO） was investigated. Firstly, WCO was esterified with methanol catalyzed by FeCl3 , and then the FeCl3 was re moved and the first reaction product was transesterified with methanol catalyzed by KOH. The results showed that FeCl3 had high catalyzed ability to esterify free fatty acids. The reaction temperature in the two steps was 65 ℃. The other optimal parameters of esterification were as follows： 2% of FeCl3 , molar ratio of methanol to WCO 11 ： 1 and 5 h of reaction time. In the second step, 1% of KOH, molar ratio of methanol to WCO 6 ： 1 and 1 h of reaction time were adopted. The yield of biodiesel was 93.6%. Compared to the traditional acidic - catalyzed method, this method had the advantages of high conversion, easy to recycle catalyst, no waste and so on.
出处
《中国油脂》
CAS
CSCD
北大核心
2007年第4期51-54,共4页
China Oils and Fats
关键词
废油脂
生物柴油
酸值
酯化
酯交换
waste cooking oil
biodiesel
acid value
esterification
transesterification
