Coal tar hydrogenation technology
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Dear experts, is coal tar hydrogenation technology mature at present? What process is mainly used? What is the specific process flow? As far as I know, the main components of coal tar are polycyclic aromatic hydrocarbons, and its ammonia nitrogen content is particularly high. Is hydrogenation also used to remove impurities?
The treatment methods for coal tar produced under medium and low-temperature conditions differ significantly from those for coal tar produced under high-temperature conditions. Among them, the treatment methods for coal tar generated under high-temperature conditions are relatively mature.
The polycyclic aromatic hydrocarbons in coal tar should be removed as much as possible from the hydrogenation process before it begins. Excessive heaviness of these compounds will inevitably increase the burden on the hydrogenation step, and it can also lead to problems such as coking and catalyst carbon deposition. Generally, pre-distillation is carried out before hydrogenation; the threshold for separation can be set around 360 degrees, or around 490 degrees, with the choice depending on specific circumstances