REACTION KINETIC OF PYROLYSIS IN MECHANISM OF PYROLYSIS- GASIFICATION PROCESS OF DRY TORRIFIED-SUGARCANE BAGASSE

Recently fossil fuel still become a main source for energy and chemical platforms. In order to substitute fossil fuel with renewable resources, biomass conversion become a promising technology to convert biomass into bio-energy and bio- chemicals. Sugarcane bagasse (SCB), as one of potential biomass, available abundant in Indonesia and its economic value can be improved with conversion of sugarcane bagasse into syngas using gasification process. This process consists of four steps: drying, pyrolysis, oxidation-reduction and oxidation reactions. The aim of this paper is to study experimental work of pyrolysis-gasification of sugarcane bagasse interpreted using model of one-step global single reaction to obtain reaction kinetics of pyrolysis in the mechanism of pyrolysis-gasification of sugarcane bagasse. Before used as raw material in gasification, sugarcane bagasse will be treated with dry-torrefaction at a temperature of 150 0C. And from this study, there are found two steps of pyrolysis in SCB, the first step is pyrolysis reaction in rapid zone and the second is slow zone of pyrolysis. Rate of pyrolysis reaction, both rapid and slow pyrolysis, are influenced by the composition of biomass i.e., composition hemicellulose, cellulose and lignin. While, dry torrefaction of SCB gives better thermal decomposition than raw SCB, increasing composition of lignin in SCB, reducing endothermic phase of celullose decomposition and increasing exothermic phase of lignin decomposition. Torrefaction of SCB also gives better kinetic reaction of pyrolysis than SCB0 which stated in constanta of reaction and order of reaction of pyrolysis. In rapid pyrolisis, value of constanta of reaction (K) of torrified-SCB is 17.167 while K of raw-SCB is 15.348 and order of reaction n is 5.245 for raw SCB and 5.040 for torrified-SCB. In slow pyrolysis, value of K is 0.065 for raw-SCB and 0.145 for torrified-CBT while order of reaction is 0.356 for raw-SCB and 0.553 for torrified-SCB.