A process for heavy oil contact cracking

Abstract

The invention discloses a process for heavy oil contact cracking. According to the process, a heavy oil cracking reactor, a coke gasifier and a heat coupler located between the heavy oil cracking reactor and the coke gasifier are included. Compared with the prior art, the process can achieve the purpose of heat balance of the coke gasifier and the heavy oil cracking reactor.

Description

technical field [0001] The invention relates to a process for heavy oil contact cracking. Background technique [0002] Conventional catalytic cracking processes mostly use oil products that meet the requirements of the catalytic cracking process in terms of specific gravity, carbon residue, heavy metal content, hydrogen content, and group composition, and use molecular sieve catalysts with high equilibrium activity as the carrier to carry out catalytic cracking reactions on the raw materials To obtain gasoline, diesel and liquefied petroleum gas and by-product dry gas, oil slurry and coke heavy oil lightening process. When the properties of raw materials exceed the requirements of catalytic cracking, catalytic raw material pretreatment, such as residual oil hydrogenation process, is mostly used to pre-refine catalytic raw materials to reduce residual carbon and heavy metals to meet the needs of catalytic cracking technology. For heavier and inferior raw materials, the oil ...

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Problems solved by technology

[0004] However, due to the mismatch between the heat required for the cracking reaction of residual oil and the heat of in-situ gasification of the produced coke on the carrier agent attached to it, there is a problem, mainly reflected in: the temperature of the carrier agent required for the heavy oil contact cracking reaction should not be too high , generally at 680-710°C, if it is too high, the ratio of agent to oil will be greatly reduced, which will lead to poor contact of oil agent in the cracking part and deterioration of product distribution; while the coke gasification part is the opposite, higher gasification temperature can make the gasification reaction Proceed in the direction that is conducive to the generation of high value-added hydrogen and carbon monoxide. If the temperature is lowered, the concentration of hydrogen after gasification will be greatly reduced, the concentration of carbon dioxide will increase, and the economic benefits will deteriorate. Process requirements; simply by cooling the carrier agent, although the agent-oil ratio requirement of the cracking reaction part can be met, the lower temperature of the raw agent makes the heat released by coke gasification insufficient, and it is difficult to maintain a higher gasification temperature

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