Abstract
Thermochemical liquefaction characteristics of sawdust were explored with ethanol as solvent and [BMIM]Cl–NiCl2 as catalyst. The influences of liquefaction parameters including reaction temperature, residence time and hydrogen initial pressure on the sawdust conversion and products distribution were studied. The maximum bio-oil yield of 75.45 % and conversion of 86.01 % were obtained in ethanol at 320 °C and 30 min under 10 MPa hydrogen pressure. The chemical composition of bio-oil and gaseous products derived from optimized conditions was analyzed via GC–MS and GC. These results showed that the dominant compounds of light oil were carboxylic acid, esters and phenol and its derivatives. In addition, the gaseous components consisted of CO2, CO, methane, ethane and ethene.
Highlights
Excessive exploitation and environmental destruction have been fatalities for the utilization of coal, petroleum and gas currently
These results showed that the dominant compounds of light oil were carboxylic acid, esters and phenol and its derivatives
The decomposition of bio-oil into gaseous products was the dominant reaction in the liquefaction process, which was consistent with the result of increasing gas yield
Summary
Excessive exploitation and environmental destruction have been fatalities for the utilization of coal, petroleum and gas currently. Thermochemical conversion processes including liquefaction, pyrolysis and gasification were employed to convert lignocellulose into liquid fuel [3,4,5]. Among these methods, liquefaction is a preferred technology due to its mild operation temperature, which could avoid cross linked and reverse reaction during liquefaction process. The critical temperature and pressure of organic solvents are far below than that of water; the reaction could be carried out at milder conditions Among these organic solvents, from the viewpoint of environmental friendliness, ethanol could be the most promising solvent in the biomass conversion. The high-pressure micro-autoclave was made in the lab
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