PRODUCING SILICA SULPHATE CATALYSTS FROM HUSK ASH AND CATALYTIC TEST ON THE REACTION OF GLYCEROL ESTERIFICATION WITH ACETIC ACID ANHYDRIDE TO SYNTHESIZE TRIACETIN
Moh. Noor Salman, Khamidinal, M. Si, Didik Krisdiyanto, M. Sc
Departement of Chemistry, Faculty of Science and Technology, State Islamic University of Sunan Kalijaga Yogyakarta
Silica sulphate catalysts has been produced from husk ash as catalysts on the reaction of glycerol esterification with acetic acid anhidride. The reaction is done to converse glycerol become triacetin. This research done with the ratio glycerol : acetic acid anhydride is 1 : 4,75 using silica sulphate catalysts from husk ash with the weight of catalysts is 5% of glycerol weight,
time of reacting is 4 hours and the temperature is 115 C. Qualitative analysis result using FT-IR and XRD on catalysts showed catalysts which has been synthezied is amorf. Wheras quantitative analysis result on the esterification product using FT-IR and GC-MS contain triacetin. The conversion of glycerol is 77% by adding silica sulphate cataysts, and 98% for silica sulphate-20 (SS-20). The acidity of catalysts doesn’t give sigificant influence on the conversion value.But long reaction time will increase the conversion and selectivity value and the re-adding of acetic acid anhydride can increase the selectivity up to 100%.