High efficiency catalytic conversion method of petroleum hydrocarbon

Abstract

The invention discloses a high efficiency catalytic conversion method of petroleum hydrocarbon, characterized by contacting high-sulfur wax oil with a heat regeneration catalyst with low equilibrium activity and relatively uniform active distribution at the lower portion of a catalytic cracking unit reactor and conducting cracking reaction, letting the generated oil gas and carbon-containing catalyst upstream be subject to selective hydrogen transfer reaction and isomerization reaction under certain reaction environment, separating the reaction oil gas to obtain a reaction product containing liquefied gas, gasoline and catalytic wax oil, and letting the spent catalyst be recycled after stripping and regeneration, wherein the catalytic wax oil and optional other secondary processing wax oil enters into the hydrotreatment unit to conduct polycyclic aromatic hydrocarbons selective hydrogenation, preferably the hydrogenation wax oil returns to the catalytic cracking unit. According to the invention, the gasoline yield, isobutene yield and total liquid yield are raised, the utilization rate of hydrogen in the raw materials is raised, and simultaneously the utilization rate of hydrogen in hydrotreatment is raised, thus the petroleum resource can be saved, and the invention provides a new approach for cleaning the refining process and 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 hydrotreating 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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