Catalytic conversion method for high sulfur wax oil

Abstract

The invention relates to a catalytic conversion method for high sulfur wax oil. The method comprises the following steps: the high sulfur wax oil and a thermal regeneration catalyst which has lower activity and relative uniform distribution of activity are contacted at the lower part of a first catalytic cracking unit reactor and are subjected to a catalytic cracking reaction, and the generated oil gas and catalyst containing carbon ascend and are subjected to a secondary cracking reaction and an isomerization reaction under a certain reaction environment; the oil gas is subjected to a separation reaction to obtain a reaction product containing liquefied gas, gasoline and catalytic wax oil; a spent catalyst is subjected to steam stripping and regeneration to be recycled, wherein the catalytic wax oil and optional other secondary processed wax oil are hydrogenated; and the hydrogenated wax oil enters a second catalytic cracking unit to be further cracked. According to the method, low carbon olefins such as ethylene, propylene and the like are furthest produced, and meanwhile the high-octane gasoline is also produced. The invention provides a new way for the cleanness of an oil refining production process and the cleanness of oil-refined products.

Description

technical field [0001] The invention belongs to a catalytic conversion method of petroleum hydrocarbons, and more specifically relates to a catalytic conversion method of an integrated process of catalytic cracking and hydrotreating of high-sulfur 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. ...

AI Technical Summary

Problems solved by technology

[0005] CN1667089A discloses a chemical refining method in which heavy raw materials are firstly hydrogenated and then catalytically cracked to maximize simultaneous production of propylene, ethylene and aromatics. However, the hydrogen consumption of this method is too high. Avoidance of partial loss of feedstock for propylene production due to acid cracking reactions

[0007] In addition, with the increasingly stringent requirements of environmental protection regulations on the production process of catalytic cracking and product quality, there are still many problems in inferior high-sulfur gas oil after hydrotreating and then catalytic cracking. SO in catalytic cracking regeneration flue gas X Emissions are also difficult to meet environmental protection requirements, and regeneration flue gas treatment devices still need to be added

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 if hydrogenated wax oil catalytic cracking produces gasoline with a lower 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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