Wahyu Diono - Academia.edu (original) (raw)
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Lignin is the second most abundant polymeric aromatic organic substance in the wood biomass after... more Lignin is the second most abundant polymeric aromatic organic substance in the wood biomass after cellulose and it contains many oxygen functional groups. Lignin has been proposed to be an alternative source of chemical compounds. Phenolic chemicals can be obtained from lignin by some chemical processes. Water at sub-and supercritical conditions can provide a high destruction and removal efficiency for variety of hazardous chemical waste. The decomposition of lignin was studied in sub-and supercritical water at temperatures 623-673K. With a reaction time, amount of the higher molecular weight compounds first decreased and then the lower molecular weight compounds increased. The chemical species in the aqueous products were analyzed using high performance liquid chromatography with a Jasco MD-2010 Plus. The main products were catechol, phenol, m,p-cresol and o-cresol. In this study, experiments of non-catalytic lignin decomposition in sub-and supercritical water by using a batch-type reactor at various operating conditions have been conducted. The rate of lignin decomposition has been determined and a reaction mechanism at the identical conditions will be proposed. Furthermore, this method can be expected for efficient lignin decomposition and high yield of valuable chemicals or not on the basis of the experimental results.
Lignin is the second most abundant polymeric aromatic organic substance in the wood biomass after... more Lignin is the second most abundant polymeric aromatic organic substance in the wood biomass after cellulose and it contains many oxygen functional groups. Lignin has been proposed to be an alternative source of chemical compounds. Phenolic chemicals can be obtained from lignin by some chemical processes. Water at sub-and supercritical conditions can provide a high destruction and removal efficiency for variety of hazardous chemical waste. The decomposition of lignin was studied in sub-and supercritical water at temperatures 623-673K. With a reaction time, amount of the higher molecular weight compounds first decreased and then the lower molecular weight compounds increased. The chemical species in the aqueous products were analyzed using high performance liquid chromatography with a Jasco MD-2010 Plus. The main products were catechol, phenol, m,p-cresol and o-cresol. In this study, experiments of non-catalytic lignin decomposition in sub-and supercritical water by using a batch-type reactor at various operating conditions have been conducted. The rate of lignin decomposition has been determined and a reaction mechanism at the identical conditions will be proposed. Furthermore, this method can be expected for efficient lignin decomposition and high yield of valuable chemicals or not on the basis of the experimental results.