The hydrothermal processing of fuel oil produced from municipal waste plastics (kerosene fraction:  Cl content = 27 ppm, N content = 927 ppm) was investigated under subcritical conditions so as to remove the organic nitrogens contained in the fuel oil. The hydrothermal processing was carried out in a small SUS316 stainless steel continuous packed-bed reactor (packed with Raschig rings) under liquid-phase conditions. Although the denitrogenation took place in pure water, the reaction proceeded much more readily in aqueous solutions of NaOH. That is, the nitrogen content in the product oil decreased to 73 ppm upon processing with 0.05 mol/L NaOH for 4.0 min at 275 °C and at the reactant weight feed ratio of unity, whereas it decreased to 16 ppm when 0.10 mol/L NaOH was similarly used at 325 °C. The chlorine content in the product oil also decreased to 3 ppm as a result of the processing at 275 °C. The rate of hydrothermal denitrogenation could well be described in terms of the homogeneous first-order reaction kinetics with the equilibrium nitrogen content under the hydrothermal processing conditions employed. Upon hydrothermal processing at 275 °C, the density, kinematic viscosity, and ignition point of the fuel oil decreased slightly.

中文翻译：

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连续填充床反应器中衍生自市政废塑料的燃料油的水热脱氮

在亚临界条件下，对由市政废塑料（煤油含量：Cl含量= 27 ppm，N含量= 927 ppm）生产的燃油进行水热处理，以去除燃油中所含的有机氮。在小型SUS316不锈钢连续填充床反应器（装有Raschig环）中在液相条件下进行水热处理。尽管脱氮是在纯水中进行的，但反应在NaOH水溶液中更容易进行。即，产物油中的氮含量在275°C下以0.05 mol / L NaOH处理4.0分钟，反应物重量进料比为1时降低到73 ppm，而在0.10 mol / L时降低到16 ppm。类似地，在325℃下使用NaOH。在275°C下进行加工的结果是，成品油中的氯含量也降至3 ppm。水热脱氮的速率可以很好地描述为在所采用的水热处理条件下均一阶反应动力学以及平衡氮含量的情况。在275°C进行水热处理时，燃料油的密度，运动粘度和着火点略有下降。