Catalytic conversion method of petroleum hydrocarbon

Abstract

The invention discloses a catalytic conversion method of petroleum hydrocarbon. High-sulfur wax oil is contacted with a heat regeneration catalyst at the lower portion of a catalytic cracking unit reactor and subjected to a cracking reaction, wherein the heat regeneration catalyst has relatively low activity and relatively uniform activity distribution, has a coarse particle size distribution and contains macropore zeolite and mesopore zeolite, the generated oil gas and a carbon-containing catalyst go up and are subjected to a selective hydrogen transfer reaction and an isomerization reaction under a certain reaction environment, the reaction oil gas is separated to obtain a reaction product containing liquefied gas, gasoline and catalytic wax oil, and the spent catalyst is recycled for use after stripping and regeneration, wherein the catalytic wax oil and optional other secondary processing wax oil are introduced into the hydrocracking unit for reaction, and preferably the hydrocracked tail oil is returned to the catalytic cracking unit. According to the method, the diesel oil yield and the cetane number of the diesel oil are increased, the mass percentages of low carbon olefins such as propylene and butylenes in the liquefied gas are increased, the hydrogen utilization rate of the raw materials is increased, and simultaneously the utilization rate of hydrogen in the raw materials is raised, so that the petroleum resource can be saved, and the method provides a novel approach for cleaning the refining process and the refined oil products.

Description

technical field [0001] The invention belongs to a catalytic conversion method of petroleum hydrocarbons, more specifically, relates to a catalytic conversion method of an integrated process of catalytic cracking and hydrocracking of inferior wax oil. Background technique [0002] The processing of high-sulfur low-quality wax oil raw materials by conventional catalytic cracking technology not only makes the SO in catalytic cracking regeneration flue gas X Emissions do not meet environmental requirements, and the sulfur content in gasoline and diesel products does not meet product specifications. Therefore, usually these high-sulfur low-quality wax oil raw materials are first hydrotreated to remove impurities such as sulfur, nitrogen and metals, saturate the polycyclic aromatic hydrocarbons in the raw materials, and improve their catalytic cracking reaction performance, and then use them as raw materials for catalytic cracking to produce low Sulfur gasoline and diesel. [00...

AI Technical Summary

Problems solved by technology

When the regenerative flue gas treatment unit handles lower levels of SO X When flue gas is used, its treatment efficiency will be reduced

In addition, even though hydrogenated wax oil catalytic cracking produces gasoline with low sulfur content, it is still difficult to reduce the sulfur content in gasoline to below 10 μg / g, and gasoline still needs post-treatment

When S-Zorb technology is used to treat gasoline with low sulfur content, it is difficult to maintain the balanced operation of S-Zorb because the sulfur content in gasoline is too low, and it is necessary to supplement other sulfur compounds from the outside, resulting in a decrease in the use efficiency of the S-Zorb unit

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