Study On Non-Hydrodenitrogenation And Non-Hydrodecolouration Of Fuel Oils

One reason of acid rain is NOX which formed in the process of burning of basic nitrogen in the fuel oils. And the basic nitrogen in the fuel oils has an important impact on activity of catalyst in hydro refining process, for example, it can shorten production cycle of catalyst. Additionally, the basic nitride compounds in fuel oils can react with some compound in the fuel oils such as alkenes, pyrrole, which bring about the color of fuel oils getting dark. Additionally, some oxygenous compounds existing in oils can spur producing colored substances which have very bad influence on the quality of fuel oils. So it is necessary to remove basic nitride compounds and some other substances which bring colors from fuel oils.The researching works have two parts in the paper.1. To remove basic nitrogen compounds form diesel oils. In this article, magnetic adsorbent for basic nitrogen compounds was prepared by precipitation method using ammonia as precipitator reaction with FeCl2and FeCl3. The removal effect of basic nitrogen in diesel oils with this adsorbent was examined and the influence of additional magnetic field on the removal effect of basic nitrogen was studied. The results show that the magnetic moment of basic nitrogen molecule was increased under additional magnetic field which promoted the adsorption of the basic nitrogen compounds on the surface of the magnetic adsorbent. So it raised the removal efficiency of nitrogen compounds greatly. Under the conditions of the temperature0℃, the reaction time10min, the ratio of adsorbent and oil0.06, and the solenoid electric current intensity5A,94%of the basic nitrogen in the model oil was removed and the recovery of the oil is higher than99.4%. And90.1%of the basic nitrogen can be removed from the actual diesel oil sample.2. To remove adding color substances from fuel oils。The color of fuel oils such as cracked diesel oil and carbonized diesel oil get darker in the process of storage which lead the color of fuel oils goes beyond the national standard, so these colored fuel oils were necessary for decoloration. In the article, the decoloration agent were synthesized with Lewis acids、active carbon, activated clay, bentonite and diato earth etc. The conditions of the experiments and yield of decolored oil were researched in cracked gasoline, straight run diesel oil, cracked diesel oil and carbonize diesel oil ect.. The results show that under the conditions of the temperature20℃, the reaction time9min, the quality of decoloration reagent ().3g/100mL, the color value of cracked gasoline was cut down from2.9to0.3and the yield of decolored oil was98.9%, under the conditions of the temperature50℃, the reaction time4min, the quality of decoloration reagent0.6g/100mL, the color value of straight run diesel oil was cut down from5.2to1.2and the yield of decolored oil was98.2%, under the conditions of the temperature85℃, the reaction time9min, the quality of decoloration reagent1.0g/100mL, the color value of cracked diesel oil was cut down from6.6to2.0and the yield of decolored oil was97.6%, under the conditions of the temperature95℃, the reaction time4min, the quality of decoloration reagent1.2g/100mL, the color value of carbonize diesel oil was cut down from4.8to1.8and the yield of decolored oil was97.4%. Generally, the decoloration reaction has relatively fast speed of response, the decolor reaction were finished in5-10min. The response temperature has larger influence on the decoloration reaction, temperature rising made contribution towards decoloration reaction, but too high temperature had a bad effect on decoloration of fuel oils.