|
Hydrogenation Process of coal tar can be completed desulfurization and denitrification, the unsaturated hydrocarbon saturation, aromatics saturation process, to reduce the content of S, N, and unsaturated hydrocarbons, and to improve its stability and corrosive purposes, access to naphtha and high-quality fuel oil. Systematic study of the basic physical properties of coal tar density, viscosity, and hydrogen solubility in coal tar, fitting analysis using Excel software. Of such data to fill a blank database domestic coal tar, and provide a basis for physical property data for the industrial design of catalytic hydrogenation of coal tar in the slurry reactor. The following conclusions: i measured atmospheric pressure, different temperatures three coal tar density, its density showed a decreasing trend with increasing temperature. With Excel the mathematical regression and analysis of three coal tar density and temperature curves, three regression equations. Ⅱ measured atmospheric pressure and different temperatures, the viscosity of the three kinds of coal tar, its viscosity with increasing temperature showed a power function. With Excel the mathematical regression and analysis of three coal tar density and temperature curves, three regression equations. Ⅲ measured at different temperatures, different pressures, the solubility of hydrogen in three coal tar using Excel software three coal tar solubility with temperature, pressure curve the mathematical regression and analysis of hydrogen in its hydrogenation reaction choose to provide the basis of the conditions. Catalytic hydrogenation of coal tar raw material in the slurry reactor, to improve the hydrogen to carbon ratio of coal tar, unsaturated bonds saturated simultaneously prolapse S, N heteroatom, the main content of this study is to improve its stability and corrosive reach to mention the quality of the coal tar purpose. Using the the orthogonal experimental methods and the means of gas chromatographic analysis of reaction temperature, reaction pressure, reaction time, catalyst type and amount of catalyst on the # 1 and # 2, the effect of coal tar hydrogenation, 2 # coal tar obtained by analyzing BEST hydrogenation reaction conditions. And 2 # coal tar in its optimal hydrogenation under reaction conditions in the slurry reactor, the catalytic hydrogenation, the application of gas chromatography and CHNS / O element analyzer right reactants and hydrogenation product C, H, O, The content of N, S analysis. The following conclusions: I under a set of experimental conditions, the # 1 coal tar hydrotreating Dominant polycondensation reaction, the total hydrogenation effect is not ideal. The hydrotreating effect of the 2 # coal tar, is very good, 26.3% of the maximum yield of the desired product. Ⅱ 2 # coal tar hydrogenation reaction by orthogonal analysis, the optimal conditions: reaction temperature of 350 ° C the reaction pressure 9MPa, reaction time 120 min the catalyst iron-based catalyst, the amount of catalyst to make 2g/100ml. Factors affecting the purpose product yield 2 # of coal tar hydrogenation product: the reaction temperature and reaction pressure is most significant, followed Finally, the catalyst type and amount of catalyst, the reaction time. Ⅲ case was not added to the hydrogen-donating solvent, # 2 coal tar in the slurry reactor, the catalytic hydrogenation treatment is feasible. Under optimized reaction conditions, the yield of the desired product was 33.9%. Ⅳ by catalytic hydrogenation, 2 # of coal tar product, the relative content of C and H, respectively, an increase of 0.41% and 2.62%, the increase in the H / C of 0.17%; the relative content of the N and S in the product is decreased by 9.21% and 34.62% respectively. By catalytic hydrogenation, 2 # hydrogenation product of coal tar in the hydrogen to carbon ratio increases, harmful elements N, and S content decreased, especially the element S relative content decreased by 34.62%. To mention quality.
|