H3PW12O40, AN EFFICIENT AND REUSABLE CATALYST FOR BIODIESEL PRODUCTION RELATED REACTIONS. ESTERIFICATION OF OLEIC ACID AND ETHERIFICATION OF GLYCEROL

J. SEPÚLVEDA; C. VERA; J.C. YORI; J. BADANO; D. SANTAROSA; D. MANDELLI

QUíMICA NOVA

SOC BRASILEIRA QUIMICA

Lugar: São Paulo – Brasil; Año: 2011 vol. 34 p. 601 - 606

0100-4042

Esterification of oleic acid with methanol and etherification of glycerol with tertbutanol was studied using H3PW12O40 (HPA); Cs2.5H0.5PW12O40 and Amberlyst 35W catalysts. In esterification at 25 °C HPA displayed the highest activity. However in etherification HPA and Amberlyst 35W showed similar initial activity. The acid properties of the catalysts were determined by means of the liquid phase reaction test of dehydration of 1,4-butanediol and by ammonia desorption. Both techniques yielded different results indicating that either dehydration proceeded over a small fraction of sites of high strength or that HPA was dissolved in the alcoholic medium and catalyzed the reaction homogeneously.