减压蜡油浆态床加氢工艺条件和动力学研究

STUDY ON THE PROCESS CONDITIONS AND KINETICS OF SLURRY-BED HYDROGENATION PROCESSING VACUUM GAS OIL

对减压蜡油的浆态床加氢工艺条件进行了评价,并考察了减压蜡油的加氢脱硫和加氢脱氮动力学。研究结果表明,最佳的蜡油加氢工艺条件为反应温度360℃、反应压力8MPa、催化剂加入量(w)9%、反应时间2h左右。动力学研究结果表明:对于加氢脱硫反应,反应初期的表观活化能为100.44kJ/mol;反应中期到末期,表观活化能为121.72kJ/mol,这是由于不同类型的硫化物脱硫机理不同造成的;对于加氢脱氮反应,表观活化能为105.17kJ/mol;在反应初期含氮化合物较难脱除,而在反应后期,烷基取代的二苯并噻吩类化合物为最难脱除的化合物。

The process conditions of slurry-bed hydrogenation processing vacuum gas oil（VGO） were investigated,and the kinetics of hydrodesulfurization（HDS） and hydrodenitrogenation（HDN） was studied as well.The results indicated that the optimal process conditions were obtained as follows： a reaction temperature of 360 ℃,a reaction pressure of 8 MPa,a catalyst mass fraction of 9% and a reaction time of 2 h.Kinetics research data suggested that for HDS reactions,the apparent activation energy in the initial stage is 100.44 kJ/mol;in the final period,the apparent activation energy is 121.72 kJ/mol due to the differences in HDS mechanism of various S-containing compounds in VGO.For HDN reactions,the apparent activation energy is 105.17 kJ/mol.During the initial reaction stage,N-containing compounds are difficult to be removed,however,with the proceeding of reactions the alkyl-substituted dibenzothiophenes（R-DBTs） become the most difficult compounds to be removed.