Detailed Description of Coal Tar Hydrogenation Process Using the Kinetic Lumping Approach

A new eight-lump kinetic model containing 19 kinetic constants is proposed to describe coal tar hydrogenation. The model contains lump 1 (> 300 degrees C), lump 2 (250-300 degrees C), lump 3 (200-250 degrees C), lump 4 (20-200 degrees C), diesel, gasoline, gas, and coke as lumps. The kinetic parameters were determined using least-squares regression analysis of the experimental data, obtained in two-stage fixed beds filled with the laboratory-made catalysts at various operating conditions. The proposed model was also validated. Comparisons between the experimental data and predictions using the lumping kinetic model showed good agreement. The variation in product yields and product distribution with operating conditions and feed properties was predicted. The effects of space velocity, hydrogen/oil ratio, temperature, initial hydrogen pressure, and other reaction conditions on hydrogenation performance were also investigated.