Effect of Zinc Oxide Catalyzes Pre-esterification of Gutter Oil
Gutter oil is a kind of renewable resources and an important precursor of biodiesel synthesis,but the higher acid value of gutter oil decreases its performance upon biodiesel synthesis.The pre-esterification can effec-tively reduce the acid value of gutter oil,avoid the corrosion of biodiesel synthesis equipment,and improve the efficiency of biodiesel synthesis.In this work,sodium hydroxide,calcium hydroxide,anhydrous potassium car-bonate,zinc oxide,basic zirconium carbonate and HND-64 solid base as catalyst,were investigated to affect the esterification efficiency of gutter oil.From the result of acid value,it was found that the optimal catalyst for ester-ification of gutter oil was zinc oxide.When at the dosage of 0.4％and reaction temperature of 180 ℃,the acid value of gutter oil decreased from 73.39 mgKOH/g to 8.95 mgKOH/g.Meanwhile,addition of ZnO catalyst was enhanced esterification reaction,reducing the sulfur content by 23.4％in gutter oil.This study provides theoretical support for improving the quality of gutter oil.
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