The types of nitrogen compounds in diesel hydrogenation process were identified by gas chromatography-mass spectrometry(GC-MS).Further,based on the retention and response characteristics of nitrogen compounds on nitrogen chemiluminescence detector(NCD),the type distribution of nitrogen compounds under different process conditions was obtained.Considering the difference of methyl number in carbazole side chain,the five-lumped Langmuir-Hinshelwood hydrodenitrogenation(HDN)kinetic model was established involving the influencing factors such as reaction temperature,reaction pressure,liquid hourly space velocity,the volume ratio of hydrogen to oil and the content of impurities(hydrogen sulfide,basic and non-basic nitrides).The model was solved by the Levenberg-Marquardt method,and the verification results show that the fitted values agree well with the experimental data.On the basis,the model can be effectively used to optimize the HDN process conditions,and the calculated results indicate that the removal effect of nitrogen compounds is the best at the reaction temperature of 350 ℃,reaction pressure of 6.4 MPa and V(H2)/V(Oil)of 300.
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