title: Production of biodiesel by esterification of oleic acid with ethanol over organophosphonic acid-functionalized silica.
abstract: Esterification of oleic acid with ethanol catalyzed by organophosphonic acid-functionalized silica SG-T-P was optimized using response surface methodology (RSM). The interactive effect of catalyst to FFA weight ratio and molar ratio of alcohol to acid were more significant than that of reaction temperature. The optimum values for maximum conversion ratio obtained by a Box-Behnken center-united design reached 77.02±0.62% when the reaction was carried out at 112°C for 10h with a molar ratio of alcohol to oleic acid of 8.8:1 and a content of 14.5wt.% triethylenetetramine bis(methylene phosphonic acid)- functionalized silica catalyst SG-T-P. The research results show that SG-T-P is a potential catalyst for biodiesel production that can adsorb water from the reaction mixture at the same time.
authors.affiliation: School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China. yinping426@163.com
authors.forename: Ping
authors.initials: P
authors.lastname: Yin
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Zengdi
authors.initials: Z
authors.lastname: Wang
authors.forename: Rongjun
authors.initials: R
authors.lastname: Qu
authors.forename: Xiguang
authors.initials: X
authors.lastname: Liu
authors.forename: Shuhua
authors.initials: S
authors.lastname: Ren
mesh_terms: D056804:Biofuels; D002384:Catalysis; D004951:Esterification; D000431:Ethanol / Q000737:chemistry*; D019301:Oleic Acid / Q000737:chemistry*; D063065:Organophosphonates / Q000737:chemistry*; D010757:Phosphorous Acids / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013696:Temperature
chemical_list: D056804:Biofuels; D063065:Organophosphonates; D010757:Phosphorous Acids; C570063:phosphonic acid; D019301:Oleic Acid; D000431:Ethanol; D012822:Silicon Dioxide