Method for highly efficient catalytic conversion of petroleum hydrocarbons

Abstract

The invention provides a method for highly efficient catalytic conversion of petroleum hydrocarbons. High-sulfur wax oil is contacted with a heat regenerated catalyst, which is low in equilibrium activity and relatively uniform in activity distribution, on the lower part of a catalytic cracking unit reactor for cracking reaction, the generated oil gas and a charcoal-containing catalyst ascend for selective hydrogen transfer reaction and isomerization reaction under a certain reactive environment, the reaction oil and gas are separated to obtain reaction products containing liquefied gas, gasoline and catalytic wax oil, and the spent catalyst is subjected to steam stripping and regeneration to be reused, wherein the catalytic wax oil and any processing wax oil enter an aromatic hydrocarbon separation unit to be subjected to aromatic hydrocarbon separation, and preferably the fractions richly containing the aromatic hydrocarbons are returned to a catalytic cracking unit. The method increases liquid yield and isobutene yield, improves the selectivity of propylene and provides a new path for ensuring a pollution-free oil refining process as well as pollution-free oil 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 of inferior wax oil and separation of aromatic hydrocarbons. 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 gasol...

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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