Heavy-hydrocarbon raw material hydrogenation treatment method

Abstract

The invention discloses a heavy-hydrocarbon raw material hydrogenation treatment method, which comprises the following contents: an upper flow reactor (hereinafter referred to as UFR) is adopted and is connected in series with a lower flow type fixed bed reactor, heavy-hydrocarbon raw materials sequentially pass through the UFR and the lower flow type fixed bed reactor, reaction effluents are fractionated through a fractionation tower, a prepositive reactor is adopted, tower bottom oil of the fractionation tower partially circulates back to the prepositive reactor, and partial or all reaction effluents of the prepositive reactor are mixed with the UFR reaction effluents to enter the lower flow type fixed bed reactor. The method has the advantages that the upper flow type reactor, the lower flow type fixed bed reactor and the prepositive reactor are cooperated and matched through regulating the material distribution proportion, the flow process and the technical conditions, the cooperation matching effect of a combination flow process hydrogenation device is further improved, and further, the operation period can be prolonged.

Description

technical field [0001] The invention relates to a hydrogenation treatment technology for hydrocarbon raw materials, in particular to a hydrogenation treatment process for 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 p...

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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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