Glycerol Gasification In Supercritical Water: Effects Of Operating Parameters

Abstract : Supercritical water gasification (temperature and pressure greater than or equal to 374 ° C and 22.1MPa, respectively) is a promising technology to produce non-fossil energy, producing a valuable gas mixture mainly composed of hydrogen, monoxide and carbon dioxide, methane and other light hydrocarbons such as ethylene, ethane, propane and butane, with no trace of gaseous pollutants. The wet biomass used in supercritical gasification makes the process less expensive compared to other processes that require drying. Also, the aqueous medium allows a reduction in the production of tars and chars thanks to the physicochemical properties of water. In this study, the gasification of glycerol in supercritical water was studied in the presence of potassium hydroxide as a catalyst. The effect of the three operating parameters on gas production was studied (temperature, initial glycerol concentration and residence time), in the presence of catalyst (0.6 wt% of KOH). The experiments were carried out in discontinuous mini autoclave at the RAPSODEE center (Albi). The results show that increasing the temperature from 458 to 542 °C has a positive effect on the supercritical water gasification of glycerol. A longer residence time of 50 minutes can increase the quantity of methane. Unlike the initial concentration of glycerol has a negative effect on gas production. When the glycerol concentration increases by 9 wt%. The quantities of gas produced have decreased considerably, hydrogen and carbon dioxide have been reduced by half, while carbon monoxide has increased proportionally with increasing initial concentration. Analysis of the remaining glycerol solutions after the completion of the reaction for different temperatures by GC-MS showed that they mainly contained aldehydes, phenols and its isomers.
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Ibtissem Houcinat, Elsa Weiss-Hortala, Nawel Outili, Abdesslam Hassen Meniai. Glycerol Gasification In Supercritical Water: Effects Of Operating Parameters. Algerian Journal of Engineering Research, Constantine 03 - Salah Boubnider University, 2018, 3, pp.13-17. ⟨hal-01877817⟩

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