title: Preparation of biodiesel from waste oils catalyzed by a Brønsted acidic ionic liquid.
abstract: Preparation of biodiesel from waste oils catalyzed by a novel Brønsted acidic ionic liquid with an alkane sulfonic acid group was investigated. The acidity and the activity of the ionic liquid were very low at lower temperature when the ionic liquid was crystalloid; they recovered at higher temperature when the crystallized ionic liquid was liquefied. When methanol:oils:catalyst molar ratios were 12:1:0.06, the yield of fatty acid methyl esters can reach 93.5% after the reaction of acidic oil with methanol had taken place at 170 degrees C for 4h. In addition, the ionic liquid had a good reusability and can be easily separated from the biodiesel by simple decantation.
authors.affiliation: Department of Chemical Engineering, Tsinghua University, Beijing, China. hanmh@tsinghua.edu.cn
authors.forename: Minghan
authors.initials: M
authors.lastname: Han
authors.forename: Wulang
authors.initials: W
authors.lastname: Yi
authors.forename: Qin
authors.initials: Q
authors.lastname: Wu
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Yongchun
authors.initials: Y
authors.lastname: Hong
authors.forename: Dezheng
authors.initials: D
authors.lastname: Wang
mesh_terms: D000143:Acids / Q000737:chemistry*; D001674:Bioelectric Energy Sources / Q000191:economics; D002384:Catalysis; D004952:Esters / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D000432:Methanol; D009821:Oils / Q000737:chemistry*; D013696:Temperature; D013818:Thermogravimetry; D014866:Waste Products
chemical_list: D000143:Acids; D004952:Esters; D052578:Ionic Liquids; D009821:Oils; D014866:Waste Products; D000432:Methanol