Catalyst-graded fluidized bed hydrogenation process

Abstract

The invention discloses a catalyst-graded fluidized bed hydrogenation process. In the method, a hydrocarbon raw material and hydrogen are mixed and introduced into a fluidized bed reactor from the bottom of the fluidized bed reactor to react under hydrogen treatment condition, the fluidized bed reactor comprises two or more than two internal circulation regions, the particle sizes of the catalyst used in different internal circulation region gradually reduce according to the sequence of the contact between the hydrocarbon raw material and the catalyst, and the reduction range is 0.01 to 1 millimeter. In the invention, the plurality of internal circulation regions are arranged in the fluidized bed reactor to form a plurality of boiling operation intervals, so the operation of the whole fluidized bed reactor is more flexible; meanwhile, catalysts of different particle sizes and different activities are used in different internal circulation regions, the reasonable matching of the property of a reaction material flow and the performance of the catalysts can be realized, the activity of the catalysts can be fully placed, the yield of light oil can be increased, and the product quality can be improved.

Description

technical field [0001] The invention relates to a fluidized bed hydrogenation process with catalyst gradation, in particular to a process for hydrogenation conversion of hydrocarbon raw materials using catalysts with different particle sizes and hydrogenation activities in the same reactor. Background technique [0002] Ebullated bed hydrogenation is a three-phase reaction process of gas, liquid and solid. After the hydrocarbon feedstock and hydrogen are mixed, they enter the high-pressure chamber of the ebullated bed reactor from the bottom of the reactor in an upflow mode, and then flow upward along the axis of the reactor through the gas-liquid distribution plate. Enter the effective reaction zone of the ebullated bed reactor. The solid catalyst particles in the reactor bed are lifted by the upward gas-liquid flow velocity, maintaining the catalyst particles in a random boiling state. The ideal ebullated bed reactor is a fully back-mixed reactor, that is, in the effectiv...

AI Technical Summary

Problems solved by technology

The disadvantage of the present invention is: since the reactor is divided into different reaction sections by using partitions, it is necessary to form an effective separation of solids and gas-liquid mixtures in the upper part of the different reaction sections, otherwise the catalyst will block the channels on the distribution plate, which will require increased separation Space or additional separation equipment, which limits the catalyst expansion ratio, reduces the effective catalytic reaction space, increases the difficulty of operation and wastes the effective reaction volume

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