中文摘要：

经1次酯化法使泔水油（初始酸值约125.46 mg.g-1）达到酸值为3 mg.g-1以下的醇解要求,需要7～8 h.在不改变原工艺路线的条件下,利用常规酸、碱催化剂,进行分步酯化,分离中间产物,加速反应,可缩短总反应时间.酯化条件为：醇油摩尔比5∶1,催化剂质量分数1.0%,温度110℃.第1次酯化时间3.5 h,第2次1 h,总时间为4.5 h,缩短了2.5～3.5 h,处理后的原料油酸值为2.657 mg.g-1.以此中性油为原料,在醇油摩尔比7∶1,催化剂质量分数1.0%,温度65℃,时间75 min条件下,原料转化率达94%以上,试验产品质量达到0#柴油的要求.

英文摘要：

It takes 7-8 h to decrease the acid value（AV）of waste cooking oils from 125.46 mg·g-1 to 3 mg·g-1 for one step esterification reaction.Based on one-step process,two-step esterification process was adopted by separating intermediate to speed reaction equilibrium with normal acid and base catalysts.The optimal reaction condition is alcohol-oil ratio of 5 with catalyst amount of 1.0% at 110 ℃.The total reaction time is 4.5 h with first esterification time of 3.5 h and second esterification time of 1 h,which is shor-tened by 2.5-3.5 h.The AV can be decreased to 2.657 mg·g-1 after treatment.With 1% catalyst,the neutral oil was reacted with alcohol-oil ratio of 7 at 65 ℃ for 75 min.The conversion rate reaches 94% and the performance can meet the main index of 0# diesel.