Hydrogen consumption of coker gasoline and coker diesel

The hydrogen consumption and the impact on bed temperature of coker gasoline and coker diesel differ. Generally, the hydrogen consumption for coker diesel is higher than that for coker gasoline. This is because diesel contains a higher amount of aromatic hydrocarbons and polycyclic aromatic hydrocarbons during the coking process, requiring more hydrogen for cracking and dehydrogenation reactions. The aromatic hydrocarbon content in gasoline is relatively low, so coker gasoline requires less hydrogen. Regarding its effect on bed temperature, coker diesel usually has a relatively high sulfur content; at high temperatures, sulfides readily form coke deposits, which significantly impair the activity of the catalyst. Therefore, coker diesel requires a higher bed temperature to ensure the progress of the reaction. Coker gasoline has a relatively low sulfur content and is less prone to coke formation; therefore, the process can be carried out at lower bed temperatures. Based on your description, if you plan to switch to an equivalent amount of coking diesel, it is necessary to pay attention to adjusting the bed temperature; it may be required to increase the bed temperature to meet the reaction conditions of diesel. At the same time, it is also necessary to consider whether the hydrogen supply is sufficient to meet the demand for coker diesel. .

The change is quite significant; it is recommended to first lower the temperature at the reaction inlet, and then adjust the feed rate. The feed adjustment should be done in stages – each time a change is made, wait until stability is achieved before making another adjustment.

Coker diesel requires hydrogenation to saturate its aromatic rings; thus, it needs a higher pressure than coker gasoline. Under the hydrogenation conditions for coker gasoline, it’s difficult to determine which consumes more hydrogen, especially since coker gasoline also contains a significant amount of olefins. Hydrogen consumption isn’t low either