Catalytic conversion method for petroleum hydrocarbon

Abstract

A catalytic conversion method for petroleum hydrocarbon. High sulfur wax oil contacts with a zeolite-containing thermal regeneration catalyst at a lower part of a catalytic cracking unit reactor and generates a cracking reaction; the generated oil gas and a carbon-containing catalyst upstream generate a selective hydrogen transfer reaction and an isomerization reaction in a certain reaction environment; the reaction oil gas is separated to obtain reaction products containing liquefied gas, gasoline and catalytic wax oil; the spent catalyst is subjected to stripping and regeneration for recycling; the catalytic wax oil and an optional secondary processing wax oil enter into a hydrocracking unit for reaction; and preferably hydrocracking tail oil returns to the catalytic cracking unit. The method increases the yield and cetane number of diesel, and increases utilization ratio of hydrogen in the raw material, so as to save oil resource and provide a novel path for clean of a refining production process and refining 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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