Low energy consumption hydrocracking method for producing high-quality chemical industry raw material

Abstract

The present invention discloses a low energy consumption hydrocracking method for producing a high-quality chemical industry raw material. According to the method, a raw material oil and hydrogen gas are subjected to heat exchange two times, and then sequentially pass through a hydrorefining reaction zone and a hydrocracking reaction zone, wherein the hydrocracking reaction zone comprises at least two hydrocracking catalysts, the upstream is filled with a catalyst I, the downstream is filled with a catalyst II, the catalyst I contains 30-70 wt% of a modified Y molecular sieve, the catalyst II contains 15-50 wt% of the modified Y molecular sieve, and the modified Y molecular sieve content in the catalyst I is 10-30% higher than the modified Y molecular sieve content in the catalyst II. According to the method of the present invention, the high temperature high pressure countercurrent heat transfer technology and the hydrocracking catalyst grading technology are organically combined, and the hydrocracking reaction heat is comprehensively utilized, such that the characteristics of the two different types of the hydrocracking catalysts are completely provided, and the catalyst selectivity is maintained while the target product quality is improved, and the project investment and the operating energy consumption are reduced.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a hydrocracking method which simultaneously uses different types of hydrocracking catalysts to improve the quality of some products and integrates a normal operation non-open flame reaction heating furnace. Background technique [0002] Since the 1990s, the crude oil processed by the world's oil refining enterprises has become significantly heavier, the sulfur and heavy metal content in crude oil has increased year by year, and the API degree has decreased; the environmental protection regulations promulgated by governments of various countries have become increasingly stringent, and the requirements for clean production processes and clean fuel production have become increasingly stringent. It is becoming more and more urgent; the growth rate of diesel demand in the refined oil market is much higher than that of gasoline, and the demand growth of aromatics and ethylene raw materials can ...

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Problems solved by technology

[0002] Since the 1990s, the crude oil processed by the world's oil refining enterprises has become significantly heavier, the sulfur and heavy metal content in crude oil has increased year by year, and the API degree has decreased; the environmental protection regulations promulgated by governments of various countries have become increasingly stringent, and the requirements for clean production processes and clean fuel production have become increasingly stringent. It is becoming more and more urgent; the growth rate of diesel demand in the refined oil market is much higher than that of gasoline, and the demand growth of aromatics and ethylene raw materials can no longer be met only by the increase of crude oil processing volume.

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

[0009] Both US6224747 and US6296758 disclose a common one-stage hydrocracking process in series. The feedstock oil passes through a hydrocracking pretreatment reaction zone and a hydrocracking reaction zone, followed by hydrofining and hydrocracking reactions, and the resulting oil is fractionated by a fractionation system. To obtain corresponding products, these methods do not make reasonable use of the heat of hydrocracking reaction, thereby reducing engineering investment and energy consumption

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