Issues regarding the hydrocracking of paraffin oil
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The feedstock for the hydrocracking unit in this facility is straight-run wax oil and coker wax oil, with straight-run wax oil being the primary feedstock. The products are light and heavy naphtha as well as liquefied gas, with naphtha being used as the feedstock for the process. I wonder whether this naphtha is intended for use in the cold oil circulation of the distillation system or for some other purpose When is diesel added as a flushing oil for the hydrogenation feed? What is its function?
During shutdown, diesel is generally used to replace the paraffin oil in the equipment; different boiling ranges enable better cleaning of the pipelines
I’m not quite sure what your question is. You’re probably referring to light oil-type catalysts; however, in the case of startup naphtha, it should be used as a base oil for distillation during startup and for circulation purposes. As for diesel, low-nitrogen diesel should be used as the feedstock for the reaction as well as for pre-sulfurization. . As for the diesel flushing oil you mentioned, it is likely used to replace the paraffin oil in the pipelines during maintenance.
1. The naphtha from the stripping column reflux tank and the fractionation column reflux tank is sent to the stabilization section; generally, this stabilization section consists of three columns: one is the absorption/desorption column, also known as the deethanization column; one is the stabilization column (debutanization column); and one is the light/heavy naphtha separation column. 2. Hydrocracking has a dedicated flushing oil system, which is used during shutdown to displace the heavy oil (wax oil and tail oil) from heat exchange equipment, pumps, and level gauges, thereby preventing the heavy oil from solidifying.
Startup naphtha is used for the oil circulation in the stabilization system
The naphtha is startup naphtha; it is understood here to refer to the oil used for stable operation； When is diesel added as a flushing oil for the hydrogenation feed? What is its function? Here, it refers to the use of diesel during startup and temperature increase, or when shutting down the system to flush the bed layer