Esterification of cooking oil for biodiesel production using composites CsSubscript2.5/SubscriptHSubscript0.5/SubscriptPWSubscript12/SubscriptOSubscript40/Subscript/ionic liquids catalysts

摘要

Here, two ionic liquids 1-methyl-3-propane sulfonic-imidazolium (PSMIM) and 1-methyl-3-propane sulfonic-imidazolium hydrosulfate (PSMIMHSO4) are synthesized, and these ionic liquids mixed with different of heteropolyacid Cs2.5H0.5PW12O40 have been used as catalysts for esterification of cooking oil for preparation of biodiesel. Then those catalysts are characterized by Infrared spectrometer, X-ray diffractometer, nuclear magnetic resonance, elemental analyses and high-performance liquid chromatography. PSMIM and PSMIMHSO4 mixed with Cs2.5H0.5PW12O40 at the mass ratio of 1:1 are able to effectively catalyze esterification, using cooking oil as starting material at ratio of 1:20 (catalyst/cooking oil) and cooking oil to methanol at mass ratio of 1:6 for preparation of biodiesel with 3.5?h at 343?K. The result showed that 97.1?% yield of biodiesel could be obtained at optimized operation using PSMIMHSO4 mixed with Cs2.5H0.5PW12O40 at the mass ratio of 1:1 as catalyst.