Hydrocracking method of low-nergy-onsumption productive high-quality chemical raw materials

Abstract

The invention discloses a hydrocracking method of low-nergy-onsumption productive high-quality chemical raw materials. After raw oil and hydrogen are mixed, the obtained mixture is subjected to heat transfer for two times and then passes through a heating furnace, the obtained object is sequentially subjected to hydrorefining and then passes through a first cracking reaction area, the obtained product is separated so as to obtain middle distillate, the middle distillate enters a second cracking reaction area to crack, wherein the first cracking reaction area is at least filled with two cracking catalysts, a catalyst I is filled in the upstream part, and a catalyst II is filled in the downstream part; and the catalyst I contains 30-70% of modified Y molecular sieve, the catalyst II contains 15-50% of modified Y molecular sieve, and the content of the modified Y molecular sieve in the catalyst I is 10-30% higher than the content of the modified Y molecular sieve in the catalyst II. In the method disclosed by the invention, a high-temperature and high-pressure countercurrent heat transfer technology and a hydrocracking catalyst grading technology are organically combined, and through the comprehensive utilization of hydrocracking reaction heat, while the selectivity of catalysts is maintained, the product quality is enhanced, and the construction investment and the energy consumption of operation are reduced.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a hydrocracking method which uses different types of hydrocracking catalysts at the same time to produce high-quality chemical raw materials in a maximum amount with low energy consumption. Background technique [0002] With the rapid development of the world economy, the demand for chemical products has increased dramatically, and correspondingly, the demand for chemical raw materials for the production of these chemical products has also increased significantly. The production of chemical raw materials from petroleum fractions is one of the very important means. The most important chemical raw materials are benzene, toluene, xylene, ethylene, propylene, etc., and heavy naphtha obtained by hydrocracking of petroleum fractions is benzene, toluene, xylene It is an important source of light aromatics, and the obtained light naphtha and hydrocracking tail oil are high-quality raw materials ...

AI Technical Summary

Problems solved by technology

This method can produce high-aromatic latent heavy naphtha and high-quality tail oil at the same time, but the process is more complicated than the conventional hydrocracking process, and has limitations. More than 60wt%, cetane number <30

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