Study On Industrialized Production Of Aromatic Hydrocarbon Solvent Oil Using Ethylene Cracking Fuel Oil

As a byproduct of the ethylene cracking unit of Xinjiang Dushantzi Petrochemical Company, the fuel oil and its systematic application was discussed and the feasibility assessment for industrialized production of aromatic hydrocarbon solvent oil was conducted. The author discussed the precise distillation process of fuel oil from cracking, and the solvent oil hydrogenation process and its operation condition was studied. By the process simulation created by chemical simulating software, the project was proved to be feasible. The contents in this thesis include: (1) Analyzing the properties of fuel oil produced from different conditions. While the temperature is under 210℃, the light components account for 45% and the aromatic hydrocarbon is more than 98%. It's feasible to carry on the industrialized production. (2) Via two-tower continuous distillation technology, the light oil under 210℃was extracted. Then the quantitative analysis of the components was achieved by chromatogram and mass spectrum. The effect of operating conditions on components and yield was studied. (3) Via two-step hydrogenation, high quality aromatic hydrocarbon solvent oil by hydrogenate the light component under 210℃to be saturation was gained. The author examined the factors which affected the saturation result such as the temperature, the air speed and the hydrogen, etc. (4) The industrialized production process was discussed, and the process flow was simulated by chemical simulating software PRO II. Meanwhile, the material balance was also implemented. (5) The actualization of the production process was discussed. The research results were as follows:I: While analyzing the raw materials of the cracking fuel oil, we found:(1) The ethylene cracking unit has 6 stoves. While all stoves produced light hydrocarbon and naphtha, the light components under 210℃account for 30% to 45%, 37% for an average. On this condition, it's most convenient for the yield of solvent oil.(2) While increase the stove form 1 to 3 to produce diesel oil, the content of the light components decrease to 18.8~8%. And this will affect the yield of solvent oil heavily.(3) At present, the ethylene cracking unit is mainly on light hydrocarbon and naphtha and the raw materials present a lighten trend. It's feasible to extract the light hydrocarbon solvent oil #150 and #200.II: The cracked fuel oil was distilled in vacuum and the light components were studied. The results found:(1) As the distill temperature increases, the heavy components increase and then heavily coked. So the long-term running can be influenced. If we can eliminate the heavy components and distill the material in vacuum the separation will be easier.III: After conducting two-step hydrogenation to the light component under 210℃get from vacuum distillation, the analysis of the product shows that the product has met the demand from market.IV: Carried on the simulation experiment by chemical simulating software PRO II and checked the material balance. The results demonstrated the process was feasible. V: Studied the actualization of the process flow.