Residual oil hydrogenation method

Abstract

The invention relates to a residual oil hydrogenation method. The method is carried out in a fluidized bed reactor; a three-phase separation region, a fluidizing region and a circulation region are arranged in the fluidized bed reactor in sequence from top to bottom. The residual oil hydrogenation method comprises the steps: injecting a first fluidized bed hydrogenation catalyst from the upper part of the circulation region, and injecting a second fluidized bed hydrogenation catalyst and a suspended bed hydrogenation catalyst from the upper part of the fluidizing region to enable the residual oil and hydrogen to be subjected to the hydrogenation reaction in the fluidized bed reactor, wherein the particle size of the first fluidized bed hydrogenation catalyst is 0.05-0.8mm greater than that of the second fluidized bed hydrogenation catalyst; according to corresponding oxide, the content of the active metal components in the first fluidized bed hydrogenation catalyst is10-80 percent lower than that of the active metal components in the second fluidized bed hydrogenation catalyst. According to the residual oil hydrogenation method disclosed by the invention, better reaction effect can be achieved.

Description

technical field [0001] The invention relates to a method for hydrogenation of residue oil, in particular to a method for hydrogenation treatment of residue oil by using an inner circulation fluidized bed reactor, and the method is particularly suitable for processing low-quality residue oil. Background technique [0002] The heavy and inferior crude oil in the world is becoming more and more serious and the market demand for light oil products continues to grow. Therefore, as an effective means of upgrading and lightening residual oil, hydrogenation of residual oil has become one of the development priorities of the oil refining industry. At present, the most commonly used residual oil hydrogenation technology in industry includes fixed bed technology and ebullated bed technology, among which the ebullated bed hydrogenation process has the following advantages: it can process heavy and inferior raw materials with high metal content and high carbon residue value; the reactor t...

AI Technical Summary

Problems solved by technology

Therefore, the existing fluidized bed hydrogenation process has the following disadvantages: (1) The process operation is complicated, requiring the use of complex material level monitors and circulating oil pumps; The bottom of the reactor subsides, causing the unit to be shut down

(2) The amount of catalyst storage in the reactor is low, and the utilization rate of the reactor space is low

(3) The energy consumption is large, and the fluidization of the solid catalyst is realized by injecting a large amount of circulating oil into the circulating oil pump.

(4) There is very little hydrogen in the circulating downcomer, which is a non-hydrogen environment, and the liquid will undergo secondary cracking reactions and coking at high temperatures to reduce product quality

Due to the small difference in liquid velocity in each internal circulation zone, a large proportion of catalysts with different particle sizes will be back-mixed in each circulation zone, so it is still unavoidable to avoid the problem that catalyst deactivation is not synchronized but cannot be recovered separately

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