Hydrocracking feedstock specifications
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Our company has a set of diesel hydroprocessing units; currently, straight-run gasoline, catalyzed diesel, and conventional diesel are fed into separate raw material buffer tanks where they are mixed together. The blending ratio can be adjusted appropriately by the workshop based on product quality or the market prices of the products and raw materials. It is quite flexible in operation. Now, the Supply Department is requesting the workshop to provide the procurement quality criteria for Direct Steam, Accelerated Diesel, and Regular Diesel. I have been in charge of the hydrocracking unit for a short period of time, so I lack experience. Which sea friend can please share the specific metrics in this regard? Thanks first!
Typically, hydrogenation reforming units use a mixture of catalytic diesel and conventional diesel in a certain ratio. The specific parameters for our company are as follows (for reference only): Parameters for catalytic diesel: specific gravity less than 0.96, boiling range less than 370 degrees, bromine value of 8–20, heavy metals such as calcium, iron, nickel, and sodium at less than 5 ppm, and cetane number index greater than 30. Parameters for conventional diesel: specific gravity less than 0.87, boiling range less than 365 degrees, bromine value less than 5, and cetane number index greater than 42
First, you need to look at the specifications required for the product oil, such as cetane number and specific gravity. Then, considering the performance of the equipment, determine by how much the specific gravity can be reduced, by how much the cetane number can be increased, and what the values are for the three feed parameters. Calculate the proportions of the feed materials, and then figure out how much of each type of oil can be fed in per day. That’s it
If it is a modification device, factors such as the 16-carbon content, freezing point, and specific gravity of the oil itself are generally taken into consideration. Of course, unforeseen issues may arise during transportation, so it is necessary to measure the total chlorine content and moisture level; that’s basically all.