Hydrogenation treatment method for inferior feedstock oil

Abstract

The invention discloses a hydrogenation treatment method for inferior feedback oil. In the method, a fluidized bed reactor and an expanded bed reactor are combined to form a novel combined process, wherein the expanded bed reactor can not only perform further hydrogenation treatment on a liquid phase effluent of the fluidized bed reactor to improve product quality, but also supplement a catalyst for the fluidized bed reactor without affecting the smooth operation of the fluidized bed at the same time. The hydrogenation treatment method can ensure the long-period smooth operation of a device on the premise of bringing the wide raw material applicability of fluidized bed hydrogenation technology into full play.

Description

technical field [0001] The invention relates to a method for hydrogenation treatment of inferior raw material oil, in particular to a method for hydrogenation treatment of inferior heavy hydrocarbons with high content of metal, colloid and asphaltene. 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. Heavy oil processing technology has become the focus of the development of the refining industry. . Heavy oil processing technology mainly includes two processes: decarburization and hydrogenation: [0003] The decarbonization process mainly includes solvent deasphalting, coking, heavy oil catalytic cracking, etc. Although the decarbonization process has low equipment investment, the yield of liquid products is low and the properties are poor, which cannot meet th...

AI Technical Summary

Problems solved by technology

However, in order to keep the catalyst in a good boiling state in the ebullating bed reactor, it is required to keep the liquid viscosity, reaction pressure, gas-liquid flow rate and reaction temperature in the reactor constant, and it is easy to directly add fresh catalyst to the ebullating bed reactor. The instantaneous fluctuation of the above conditions will cause the fluid state and operating conditions in the reactor to be unstable in an instant, which will affect the hydrogenation reaction effect and the operation cycle of the device

In addition, due to the high initial activity of the fresh catalyst, directly adding it to the ebullated bed reactor and mixing it with inferior heavy and residual oil raw materials will lead to rapid carbon deposition on the catalyst and rapid loss of activity, which will affect the hydrogenation reaction effect of the reactant stream. Increase the replacement frequency of the catalyst

[0006] Invention patents CN101418222A, CN1335357A, and CN10136080A are the prior art of inferior residual oil treatment methods, wherein CN101418222A has adopted a combined reaction device of ebullated bed and suspended bed; CN1335357A has adopted a combined reaction device of expanded bed and moving bed; CN10136080A has included at least Two upflow reactors connected in series, but none of these prior art discloses an on-line replenishment method of catalyst when the catalyst in the reactor cannot reach the required activity

The process is to directly add the catalyst to the ebullating bed reactor by gravity. The addition method of the catalyst will make the catalyst with high initial activity quickly deposit carbon when it contacts with inferior raw materials, accelerate the deactivation rate, and increase the replacement frequency of the catalyst. At the same time, because the preheating temperature of the catalyst and hydrogen is lower than the reaction temperature, it will cause fluctuations in the ebullated bed reaction temperature, unstable operation of the device, and affect product quality

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