Five com. glycerols of various purity were esterified with AcOH to glycerol mono-, di- or tri-acetates either in a non-catalyzed process or in presence of H2SO4, HCI, H3PO4, p-MeC6H4SO3H and 6 cation exchange resins at 60-118 degrees C for 90-130 min. The concd. H2SO4 and Dowex DR8H+ resin showed the highest acidity and catalytic activity in the process (conversions close to 100% and selectivity to triacetate above 15%). The presence of H2O resulted in a decrease in glycerol conversion.