A description of the process involving a certain chemical agent and coal tar

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I work at a coal tar hydrogenation company with an annual processing capacity of 500,000 tons. The pre-treatment of coal tar takes place in two units: a vacuum unit and a refining unit! Everyone is probably very familiar with decompression, so I won’t go into details! I’ll mainly talk about the refining unit. The refining unit and the depressurization unit operate in parallel, but when starting up, only one of them can be used! The general process in the refining unit is as follows: The crude oil at 60°C is pumped from the storage tank into a heat exchanger, where it exchanges heat with the hydrogenation refining cycle oil until its temperature reaches 90°C. It is then sent directly to a mixed tar tank, where it mixes thoroughly with a certain agent developed by our company. After another heat exchange to raise the temperature to 135°C, it enters a tar vacuum tower for vacuum extraction. Subsequently, it passes through a first-stage pressure filter for metal and solid residue removal. It is then transferred to a second tank for further vacuum extraction, followed by processing in a second-stage pressure filter to achieve more thorough residue removal. Finally, it goes into a tank containing the refined tar product, undergoes one more round of vacuum extraction, and is then subjected to hydrogenation to produce diesel and gasoline! Has anyone else done this kind of work?