Hydrocracking method for producing middle distillates to maximum extent

A middle distillate and hydrocracking technology, applied in hydrotreating process, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problem of high activity of molecular sieve hydrocracking catalyst, low reaction temperature, low yield of middle distillate, etc. problems, to achieve the effect of protecting activity and selectivity, improving yield, and improving selectivity

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with amorphous hydrocracking catalysts, molecular sieve hydrocracking catalysts have high activity and low initial reaction temperature, but the yield of middle distillates is relatively low

Method used

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  • Hydrocracking method for producing middle distillates to maximum extent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] When the reaction pressure is 14.5MPa, the reaction temperature in the hydrofinishing section is 380°C, the reaction temperature in the hydrocracking section is 370°C, and the volumetric space velocity (for fresh raw materials) in the hydrofinishing section is 1.8h -1 , the volumetric space velocity of the hydrocracking section (for all feeds in the hydrocracking section) is 1.3h -1 Under the reaction conditions of the present invention, with the hydrocracking method provided by the present invention, a test was carried out using raw material A, and the ratio of RN-32V and RHC-140 catalyst filled in the hydrofinishing reactor was 3:1. The ratio of the fresh feedstock oil entering the hydrorefining reactor and the hydrocracking reactor is 9:1, and all tail oil fractions are recycled back to the hydrocracking reactor. H in the reaction atmosphere of the cracking reactor 2 S partial pressure is 0.015MPa, NH 3 The partial pressure is 0.003MPa. The test results are shown ...

Embodiment 2

[0038] When the reaction pressure is 14.5MPa, the reaction temperature in the hydrofinishing section is 380°C, the reaction temperature in the hydrocracking section is 380°C, and the volumetric space velocity (for fresh raw materials) in the hydrofinishing section is 1.8h -1 , the volumetric space velocity of the hydrocracking section (for all feeds in the hydrocracking section) is 1.3h -1 Under the reaction conditions of the present invention, with the hydrocracking method provided by the present invention, a test was carried out using raw material A, and the ratio of RN-32V and RHC-140 catalysts filled in the hydrofinishing reactor was 1:1. The ratio of fresh raw oil entering the hydrorefining reactor and the hydrocracking reactor is 4:1, and all tail oil fractions are recycled back to the hydrocracking reactor. H in the reaction atmosphere of the cracking reactor 2 S partial pressure is 0.03MPa, NH 3 The partial pressure is 0.006MPa. The test results are shown in Table 3...

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Abstract

The invention provides a hydrocracking method for producing middle distillates to the maximum extent. The method comprises the following steps of: simultaneously leading fresh raw oil to a hydrorefining reactor and a hydrocracking reactor in a mode of parallel flow; filling a hydrorefining catalyst and an amorphous hydrocracking catalyst in the hydrorefining reactor in sequence; filling a molecular sieve hydrocracking catalyst in the hydrocracking reactor; separating reactor effluent of the hydrorefining reactor to obtain light fraction and tail oil fraction; and sending all or partial tail oil fraction to the hydrocracking reactor, and simultaneously sending reactor effluent of the hydrocracking reactor and partial raw oil to the hydrorefining reactor. The hydrocracking method for producing middle distillates to the maximum extent can process heavy distillates and produce middle distillates to maximum extent. Because partial raw oil is sent to the hydrocracking reactor, over high cracking activity of the hydrocracking catalyst is avoided under the non-ammonia environment of the hydrocracking reactor system, and the secondary cracking phenomenon of more middle distillates is also avoided, so that the yield of the middle distillates is effectively improved.

Description

technical field [0001] The invention belongs to a hydrocracking method for obtaining low-boiling distillate hydrocarbon oil in the presence of hydrogen. Background technique [0002] With the deterioration of crude oil quality year by year and the increasingly stringent environmental protection requirements worldwide, the hydrocracking process, as one of the main means of crude oil secondary processing and heavy oil lightening, has strong raw material applicability, flexible production plan, liquid With high product yield and good product quality, it is playing an increasingly important role in the deep processing of sulfur-containing and high-sulfur crude oil to produce clean fuels, and its application range is becoming more and more extensive. [0003] In recent years, the market demand for various oil products, especially high-quality middle distillate products, has continued to grow, and the pressure on refineries to produce high-quality middle distillate products has al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
Inventor 董建伟胡志海陈元君董松涛赵阳王子文龙湘云聂红
Owner CHINA PETROLEUM & CHEM CORP
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