A combined processing method of residual oil hydrotreating and catalytic cracking
A catalytic cracking and residual oil hydrogenation technology, which is applied in the fields of hydrotreating process, petroleum industry, and hydrocarbon oil treatment, can solve the problems of increasing catalyst coking deactivation tendency, reducing diffusion and reaction performance, and reducing catalytic cracking of heavy oil, etc. To achieve the effect of increasing the yield of liquid products, prolonging the operation cycle and increasing the content
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Embodiment 1
[0052] In this embodiment, the hydrogenation treatment is carried out in a fixed bed reactor, and along the flow direction of the material in the fixed bed reactor, the hydrogenation protecting agent, the hydrodemetallization catalyst and the hydrodesulfurization catalyst are sequentially filled in the fixed bed reactor, Among them, the hydrogenation protection agent, hydrodemetallization catalyst and hydrodesulfurization catalyst are all produced by Changling Catalyst Factory of Sinopec Catalyst Branch, and the trade names are RG-30A, RDM-32 and RMS-30 respectively, by weight, The loading ratio of hydroprotecting agent, hydrodemetallization catalyst and hydrodesulfurization catalyst is 5:45:50.
[0053] This embodiment 1 according to figure 1 The flow shown is carried out, and the flow after the stable operation is as follows.
[0054] (1) The feedstock oil (heated residual oil A and FCC heavy diesel oil) is mixed with hydrogen and sent to the residual oil hydrogenation reac...
Embodiment 2
[0059] The residual oil was processed in the same method as in Example 1, except that the initial cut-off temperature of catalytic cracking heavy diesel oil was 240°C, and the cut-off point of final distillation was 350°C. The test results are listed in Table 2.
[0060] Table 2
[0061]
[0062] *: by weight **: total liquid yield = liquefied gas + gasoline + diesel + heavy diesel
[0063] As can be seen from the results in Table 2, the content of sulfur, carbon residue, nickel and vanadium in the hydrogenated oil produced in Example 1 is lower than that of Comparative Example 1; and; compared with Comparative Example 1, the hydrogenation of Example 1 In the produced oil, the amount of hydrogenated diesel oil increased by 1.6 times, and the amount of residual hydrogenated tail oil decreased by 21.5% by weight. It shows that the method of the present invention can obtain better hydrotreating effect and reduce the burden of catalytic cracking unit. Example 1 After one cycle...
Embodiment 3
[0067] The residual oil is treated in the same way as in Example 1, the difference is that the residual oil B is used, the initial cut-off temperature point of catalytic cracking heavy diesel oil is 310°C, and the final cut-off temperature point is 350°C. The process conditions for catalytic cracking are listed in Table 3. The properties, product distribution and carbon content of the hydrodesulfurization catalyst unloaded from the fixed-bed reactor after 360 hours of operation of the hydrogenated oil are listed in Table 3; the product distribution of the oil and gas products obtained by catalytic cracking is shown in Table 3 listed.
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