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Hydrocracking method for producing middle distillates to maximum extent

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

Active Publication Date: 2012-12-05
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 of the hydrorefining section is 380℃, the reaction temperature of the hydrocracking section is 370℃, and the volumetric space velocity of the hydrofining section (for fresh raw materials) is 1.8h -1 , The volumetric space velocity of the hydrocracking section (all feed to the hydrocracking section) is 1.3h -1 Under the reaction conditions provided by the invention, the hydrocracking method provided by the present invention was tested using raw material A, and the ratio of RN-32V and RHC-140 catalyst filled in the hydrofining reactor was 3:1. The ratio of the fresh feed oil entering the hydrofining reactor to the hydrocracking reactor is 9:1, and all the tail oil fractions are recycled back to the hydrocracking reactor. H in reaction atmosphere of cracking reactor 2 S partial pressure is 0.015MPa, NH 3 The partial pressure is 0.003MPa. The test results are shown in Table 2. Based on 100% of the fresh raw mater...

Embodiment 2

[0038] When the reaction pressure is 14.5MPa, the reaction temperature of the hydrorefining section is 380℃, the reaction temperature of the hydrocracking section is 380℃, and the volumetric space velocity of the hydrorefining section (for fresh raw materials) is 1.8h -1 , The volumetric space velocity of the hydrocracking section (all feed to the hydrocracking section) is 1.3h -1 Under the reaction conditions of the invention, the hydrocracking method provided by the present invention was tested using raw material A, and the ratio of RN-32V and RHC-140 catalyst filled in the hydrofining reactor was 1:1. The ratio of the fresh feed oil into the hydrofining reactor and the hydrocracking reactor is 4:1, and all the tail oil fractions are recycled back to the hydrocracking reactor. H in reaction atmosphere of 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. Based on 100% fresh raw material, the yields of...

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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 point fraction hydrocarbon oil in the presence of hydrogen. Background technique [0002] With the deterioration of crude oil quality year by year and stricter environmental protection requirements worldwide, the hydrocracking process, as one of the main methods for the secondary processing of crude oil and the lightening of heavy oil, has strong applicability of raw materials and flexible production schemes. With high product yield and good product quality, it plays 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 also increasing. [0003] In recent years, the market’s demand for various oil products, especially high-quality middle distillate products, has continued to increase, and the pressure on refineries to produce high-quality middle distillate products has also increased. The...

Claims

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Application Information

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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