Esterification of cooking oil for biodiesel production using composites Cs2.5H0.5PW12O40/ionic liquids catalysts

Abstract

Here, two ionic liqs. 1-methyl-3-propane sulfonic-imidazolium (PSMIM) and 1-methyl-3-propane sulfonic-imidazolium hydrosulfate (PSMIMHSO4) are synthesized, and these ionic liqs. mixed with different of heteropolyacid Cs2.5H0.5PW12O40 have been used as catalysts for esterification of cooking oil for prepn. of biodiesel. Then those catalysts are characterized by IR spectrometer, X-ray diffractometer, NMR, elemental analyses and high-performance liq. chromatog. 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 prepn. 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. [on SciFinder(R)]