Preparation Of The Second Generation Biodiesel From Hydrodeoxygenation

Vigorously develop new energy technologies is the only way to solve the human energy crisis, and current research of new energy has reached a certain height and depth. As a main alternative fuel, biodiesel has attracted more and more attention. Linear diesel paraffin, as the mainly component of the second generation biodiesel, is obtained in the reaction of vegetable oil hydrodeoxygenation.In this dissertation, a kind of Mo-Ni/y-Al2O3catalyst with pseudo-boehmite as the precursor support was prepared by kneading and impregnation. The result of TEM, ICP, XRD, BET and other related characterization means that the kneading method can effectively guarantee the content of active component in catalysts.In the reaction, micro fixed bed reactor was used. Vegetable oil hydrodeoxygenation process optimum reaction conditions were determined with jatropha oil and cottonseed oil as the valuation system. Compared the results of catalyst under the conditions of hydrogen pressure4MPa, reaction temperature360℃, and LHSV1.0h-1, we found the catalyst with the number of V has the best catalytic effect. Triglyceride from vegetable oil transformed into linear paraffin through hydrogenation saturation, hydrodeoxygenation, and hydrogenation decarburization. Results from gas chromatography and elemental analysis showed the highest yield as80.3%located in the scope of theoretical yield and the highest deoxidation rate as99.2%. The result of long time stability of the catalyst means that the catalyst prepared had a long service life, thus is suitable for industrial application.It is different in the molecular structure between free fatty acids and triglycerides. Hydrodeoxygenation of oleic acid can be implemented by using number V catalyst under the condition of380℃with the product yield as68.7%. After the modification by Si, the reaction temperature can be reduced to360℃.The vegetable oil and fatty acid coupling process was tested. The proportion of cottonseed oil and oleic acid can be changed to obtain biodiesel under certain reaction conditions. This result is useful for industrial application.