Multistage hydrogenation method for heavy hydrocarbon

Abstract

The invention discloses a multistage hydrogenation method for heavy hydrocarbon. The method comprises the following technical steps of: mixing a condensed heavy hydrocarbon raw material and a gas phase material flow discharged from a hydrogenation desulfurization reactor and a hydrogenation denitrification reactor, and putting the mixture into a boiling bed hydrogenation demetalization reactor; cooling and purifying the reacted gas phase material flow and taking the cooled and purified reacted gas phase material flow as recycled hydrogen; mixing a liquid phase material flow subjected to the boiling bed demetalization reaction and the hydrogen, and putting the mixture into the hydrogenation desulfurization reactor; mixing the liquid phase material flow subjected to the desulfurization reaction with the hydrogen, and putting the mixture into the hydrogenation denitrification reactor, wherein at least one of the hydrogenation desulfurization reactor and the hydrogenation denitrification reactor is a fixed bed reactor. Compared with the prior art, the method provides a novel flexible, efficient and energy-saving operating mode for treating inferior heavy and residual oil raw materials; the property of the raw materials is organically combined with characteristics of the hydrogenation reactions, so the reaction released heat is fully used, the quality of the product is perfect and the operation process can be flexibly adjusted as required on the premise of guaranteeing the stable operation of a device.

Description

technical field [0001] The invention relates to a multi-stage hydrogenation method for heavy hydrocarbons, in particular to the hydrogenation of heavy hydrocarbon raw materials such as low-quality heavy oil and residual oil, such as hydrodemetallization, hydrodesulfurization, and hydrodenitrogenation, using fluidized bed and fixed bed technologies. process method. Background technique [0002] With the vigorous development of heavy crude oil and the changes in the demand structure of petroleum products worldwide, the market demand for light fuel oil continues to grow rapidly and the demand for heavy fuel oil decreases rapidly. The deep processing technology of heavy oil has become the development of the refining industry. focus. Heavy oil hydrogenation technology is the most effective processing method that can not only meet the current environmental protection requirements, but also maximize the light weight of heavy oil. Heavy oil hydrogenation technology can be divided ...

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Problems solved by technology

The combined process is only based on the liquid feed requirements of different devices for the joint use of devices, without specific combination of the characteristics of various processes, try to maximize the advantages of each process

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