Hydrotreatment and catalytic cracking combined method of heavy hydrocarbon raw material

Abstract

The invention discloses a hydrotreatment and catalytic cracking combined method of a heavy hydrocarbon raw material. According to the invention, an upflow reactor is at least connected in series with a downflow fixed bed reactor. The heavy hydrocarbon raw material passes through UFR and is mixed with a catalytic cracking heavy fraction, and the mixture enters the downflow fixed bed reactor. A hydrogenation reaction effluent is separated so as to obtain a liquid phase, and the liquid phase is subjected to catalytic cracking. The obtained catalytic cracking heavy fraction returns to an inlet of the downflow fixed bed reactor. According to the method, the catalytic cracking heavy distillate oil, which is introduced into the inlet of the fixed bed reactor, is beneficial to hydrogenation reaction and can significantly improve temperature rising of the bed when used as cutback oil and can minimize the amount of hydrogen injected through the inlet when used as a hydrogen donor, thus further raising cooperative effect of combined flow equipment and prolonging the running period as well.

Description

technical field [0001] The invention relates to a hydrogenation treatment technology for hydrocarbon raw materials, in particular to a method for hydrogenation treatment of heavy hydrocarbon raw materials including atmospheric residue oil and vacuum residue oil. Background technique [0002] As crude oil becomes heavier and worse, more and more heavy oil and residual oil need to be processed. The processing of heavy oil and residual oil not only needs to be cracked into products with low boiling points, such as naphtha, middle distillate oil and vacuum gas oil, but also to increase their hydrogen-carbon ratio, which requires decarbonization or Hydrogenation method to achieve. Among them, the decarbonization process includes coking, solvent deasphalting, heavy oil catalytic cracking, etc.; the hydrogenation process includes hydrocracking, hydrofining, hydrotreating, etc. The hydrogenation process can not only hydrogenate and convert residual oil, improve the yield of liquid...

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Problems solved by technology

[0006] In the existing combined process of UFR reactor and downflow fixed bed reactor, there is a problem that the operating cycle and reaction temperature of UFR reactor and downflow fixed bed reactor do not match with the extension of operation time. There is no temperature raising means at the inlet of the reactor, and the reaction activity of the downflow fixed bed cannot be fully exerted, which is not conducive to prolonging the operation period

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