Technology Of Biomass Conversion To Biofuel Based On Supercritical Alcohol

Bioenergy is a kind of environment-friendly, renewable resources. As the fossil fuels are depleting, the governments and the scientists pay more attention to focus on bioenergy. It is expected to become an important alternative fuel for vehicles in the future.The thermochemical method based on supercritical technology has been used to convert biomass resources into renewable, cost-competitive, good performance biofuels, and are mainly used for automobile fuel. The pyrolysis behavior and optimized parameters of biomass conversion based on supercritical methanol and ethanol have been studied. The depolymerization mechanism of cellulose, lignin and hemicellulose has been revealed. The target of this thesis is to optimize and control the process of biomass pyrolysis based on supercritical fluid. It can provide technical support for commercialization and industrial applications.The supercritical pyrolysis device was designed and manufactured. The relevant experimental parameters such as temperature, pressure, heating time, the catalyst, the ratio of solid to liquid were optimized. The modern analytical instruments such as gas chromatography and mass spectrometry (GC-MS), thermogravimetric analyzer were used for product composition analysis. The pyrolysis mechanism of biomass in supercritical fluid was revealed through theoretical analysis.The findings or conclusions in this thesis are as follow: (1) establishing a bamboo pyrolysis kinetics empirical model; (2) Optimization pyrolysis parameters of bamboo, Chinese fir in supercritical methanol, ethanol; (3) Presentation of pyrolysis reaction products, mainly for the following C10 alcohols, esters, ketones and ethers, and other substances; (4) Experimental study of the catalyst on the liquefaction rate and the rate of decomposition, and pointed out that Potassium Carbonate can raise the rate of liquefaction; (5) the main mechanism of pyrolysis of cellulose, lignin and hemicellulose in supercritical fluid has been showed; (6) The study of co-liquefaction of biomass and Waste plastics showes that plastic can be used for hydrogen system or pyrolysis liquefaction formed in the membrane, so that biomass liquefaction rate increase.