Modeling and Simulation of Reaction and Fractionation Systems for the Industrial Residue Hydrotreating Process



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2. Process Description 

The residue hydrogenation technology is one of the most effective ways to deeply hydro treat 

the heavy oil. The process is implemented in fixed beds for removal of the majority of impurities from 

oils, which can supply excellent raw materials to the subsequent catalytic cracking process. In the 

fixed bed reactors, both hydrotreating and hydrocracking reactions take place in appropriate 

temperature, pressure, hydrogen–oil ratio, and liquid hourly space velocity (LHSV) conditions. 

Generally, four reactors are adopted and connected in series, and the main function of each reactor is 

to remove some specific impurities.   

A schematic diagram of the residue hydrogenation unit is displayed in Figure 1. The raw 

materials are blended with vacuum heavy wax oil, coke gas oil, tar wax oil and catalytic circulating 

oil. Before entering the reaction system, the blended oil is filtered in a buffer tank. Then the oil is 

boosted in the pump and exchanged heat with the reactor effluent. Afterwards, the oil goes through 

the heating furnace before entering the first reactor. Thus, the first reactor temperature is mainly 

affected by the heating furnace.   




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