2011 : Degradation of glycerol using hydrothermal process
Dr.Eng. Siti Machmudah , ST.,M.Eng.
Dr. Lailatul Qadariyah ST., MT
Sub-critical or supercritical water was utilized for the degradation of glycerol in an environmentally benign reaction. The reaction was carried out in a batch reactor in the temperature range of 473–673Â K, pressure of 30Â MPa, and reaction time of 20–60Â min. The effects of temperature and reaction time were observed. The degradation of glycerol produced acetaldehyde, acrolein, allyl alcohol and un-identified products. The highest yield of acrolein, acetaldehyde and allyl alcohol were 0.20, 7.17, 96.69Â mol%, respectively. Glycerol conversion was 99.92Â mol%. While acetaldehyde was formed only in sub-critical water and allyl alcohol only in supercritical water, acrolein was formed in both. The kinetics of the global reaction displayed a pseudo-first-order. The activation energy at subcritical water was 39.6Â kJ/mol. Based on the results, this method could be an efficient method for glycerol degradation because the highÂ …