title: In situ reactive extraction of cottonseeds with methyl acetate for biodiesel production using magnetic solid acid catalysts.
abstract: A magnetic solid acid catalyst S2O8(2)(-)/ZrO2-TiO2-Fe3O4 was prepared by coprecipitation and impregnation methods and its catalytic activity was investigated for the reactive extraction of cottonseeds with methyl acetate to produce biodiesel. The physicochemical properties of the catalyst were characterized in detail. The influences of Zr/Ti molar ratio and calcination temperature on the catalytic performance were investigated. Moreover, optimization of the reactive extraction process was performed using response surface methodology coupled with central composite design. The catalyst with a Zr/Ti molar ratio of 3/1 calcined at 550°C showed the best activity. An optimum biodiesel yield of 98.5% was obtained under the reaction temperature of 50°C, catalyst amount of 21.3wt.%, methyl acetate/seed ratio of 13.8ml/g and 10.8h of reaction time. Reuse of this catalyst indicated that it had steady catalytic activity and high recovery rate which could be a promising catalyst for biodiesel production from oilseeds.
authors.affiliation: College of Forestry, Northwest A&F University, Yangling 712100, China.
authors.forename: Haitang
authors.initials: H
authors.lastname: Wu
authors.affiliation: College of Science, Northwest A&F University, Yangling 712100, China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Liu
authors.affiliation: College of Forestry, Northwest A&F University, Yangling 712100, China.
authors.forename: Junhua
authors.initials: J
authors.lastname: Zhang
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China. Electronic address: liguanglu345@gmail.com.
authors.forename: Guanglu
authors.initials: G
authors.lastname: Li
mesh_terms: D000085:Acetates / Q000737:chemistry*; D000143:Acids / Q000737:chemistry*; D000704:Analysis of Variance; D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D002384:Catalysis; D003368:Gossypium / Q000737:chemistry*; D060328:Magnetic Phenomena; D009716:Numerical Analysis, Computer-Assisted; D059027:Recycling
chemical_list: D000085:Acetates; D000143:Acids; D056804:Biofuels; C046923:methyl acetate
keywords: Biodiesel; Cottonseed; Magnetic solid acid catalyst; Methyl acetate; Reactive extraction