Kinetic Model for Low-Temperature Coal Tar Hydrorefining

In this work, the hydrorefining of coal tar was carried out in a three-stage fixed-bed reactor to produce clear fuel. Three catalysts containing hydroprotecting (HP) catalyst, hydrodesulfurization (HDS) catalyst, and hydrodenitrification (HDN) catalyst were loaded into three reactors in sequence in the grading ratio of 0.23:0.3:0.47. Based on 1200 h of experimental data, a kinetic model for HDS, HDN, and the production of the desired products of coal tar hydrorefining was established. The model can not only more accurately predict the yield of the desired products and the sulfur and nitrogen contents of the hydrorefining products at different liquid hourly space velocities (LHSVs), pressures, and temperatures, but can also predict the changea in product properties occurring as a result decreasing catalyst activity after long periods of operation.