Catalytic cracking method and device

Abstract

The invention discloses a catalytic cracking method and device, overcoming the defects of high gas and coke yields and low liquid yield which are caused by secondary cracking in the prior art. The method comprises the following steps: introducing a raw material oil into the lower part of a riser reactor so as to be contacted and reacted with a catalyst from a heat exchanger; carrying out crude separation on oil gas after reaction and a spent catalyst; further separating fine catalyst powder out of the reaction oil gas obtained by separation and then introducing the reaction oil gas without the fine catalyst powder into a fractionating column; carrying out steam stripping on the spent catalyst obtained by separation, and then introducing the spent catalyst subjected to steam stripping into a regenerator for regeneration; and introducing a part of regenerated high temperature reclaiming agent into the riser reactor from different heights of the riser reactor, introducing the other part of regenerated high temperature reclaiming agent into the heat exchanger, and the cooled reclaiming agent is recycled.

Description

technical field [0001] The invention belongs to the field of catalytic cracking of hydrocarbon oil in the absence of hydrogen, and in particular relates to a novel catalytic cracking method and device. Background technique [0002] In recent years, catalytic cracking technology has developed rapidly at home and abroad, and various new production technologies for increasing production of low-carbon olefins and clean gasoline have emerged one after another, but the maximization of economic benefits is always the goal pursued by enterprises, and low dry gas and coke yields, high liquid yield, It has always been the fundamental means for catalytic cracking technology to improve economic benefits. Various research institutions at home and abroad have made fruitful research in this area, and the developed technologies mainly include the following: [0003] UOP company's "X design" (US 5451313), UOP company invented this new design in 1995, its purpose is to improve the ratio of a...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that although the residual activity of the gasoline spent catalyst is relatively high, there is still a certain gap compared with the regenerated catalyst.

This technology plans to add a regeneration inclined pipe and an air lift pipe, and set a catalyst cooler on the newly added regeneration inclined pipe. The cooled catalyst is mixed with the hot catalyst from the original regeneration inclined pipe, and the temperature is lower after mixing. The regenerant reacts with raw materials in contact. This technology can reduce the mixing temperature of the oil agent, increase the ratio of agent to oil, and improve product distribution. However, the cooling measures of the regenerant in this technology are slightly complicated and require more equipment.

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