Combined process of hydrotreatment and catalytic cracking for residual oil
A hydrotreating and catalytic cracking technology, applied in hydrotreating process, petroleum industry, hydrocarbon oil treatment, etc., can solve the problems of complex equipment, low conversion rate of fixed bed, complicated operation, etc., and reduce the difficulty of reaction and harsh processing The effect of reducing the speed, type and number of devices, and improving the reaction effect
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Embodiment 1
[0032] In this embodiment, the fluidized bed, fixed bed, and catalytic cracking combined process in the hydrotreating of the residue is used to carry out the hydroconversion of the residue. First, the residual oil feedstock is preheated and mixed with the catalytically cracked heavy distillate oil and hydrogen into the boiling bed hydrotreating unit, and the hydrogenation reaction is carried out under the prepared different boiling bed hydrogenation catalysts and process conditions to remove the raw material. Heteroatoms such as sulfur, nitrogen and metals can also convert asphaltenes into colloids or smaller molecules to reduce product viscosity. The hydrogenated product is separated to obtain liquid-phase reformed oil, which enters the fixed-bed hydrogenation unit The reaction is carried out, and the product oil is obtained under the fixed bed graded catalyst and reaction conditions. The produced oil enters the catalytic cracking unit to be further cracked and converted into ...
Embodiment 2
[0047] Compared with Example 1, the fluidized bed reactor uses a mixed catalyst. The long-term stability of the fixed bed is good, as shown in Table 4, where the temperature of the fixed bed reactor is increased by 3°C at 5000, 8000, and 12000 hours.
[0048] Table 5 The stability results of the fixed bed hydrogenation reaction system.
[0049] Example Example 1 Example 2 Operating time, hour Metal content of the final oil (μg / g) / total pressure drop of the fixed bed reaction system (MPa) Metal content of the final oil (μg / g) / total pressure drop of the fixed bed reaction system (MPa) 5008.5 / 0.066.3 / 0.06 50008.7 / 0.086.8 / 0.06 80008.2 / 0.095.9 / 0.07 120009.1 / 0.116.5 / 0.08
[0050] It can be seen from the stability experiment results of the above-mentioned fixed bed reaction system that the method of the present invention can realize the long-period stable operation of the fixed bed hydrotreating device. According to the development trend, it can be predicted that the method of the ...
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