Co-current flow hydrocracking method for increasing production of middle distillates

A middle distillate and hydrocracking technology, which is applied in the fields of hydrotreating process, petroleum industry, hydrocarbon oil treatment, etc., can solve the problem of low selectivity of middle distillate, achieve good nitrogen resistance, improve adaptability, protect Active and Selective Effects

Active Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a parallel flow hydrocracking method for increasing the production of middle distillates on the basis of the prior art, so as to solve the problem of low selectivity of middle distillates in the prior art

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  • Co-current flow hydrocracking method for increasing production of middle distillates

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Embodiment 1

[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 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, with the hydrocracking method provided by the present invention, a test was carried out using raw material A, and the ratio between the catalyst RHC-140 and RHC-131 loaded in the hydrocracking reactor was 1:3. The ratio of fresh raw oil entering the hydrofinishing reactor and the hydrocracking reactor is 6:1, and all tail oil fractions are recycled back to the hydrocracking reactor. H in the reaction atmosphere of the hydrocracking reactor 2 S partial pressure is 0.021MPa, NH 3 The partial pressure is 0.005MPa. The test results are shown in Table 2. Based on...

Embodiment 2

[0040] When the reaction pressure is 14.5MPa, the reaction temperature in the hydrofinishing section is 375°C, the reaction temperature in the hydrocracking section is 380°C, and the volume 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, with the hydrocracking method provided by the present invention, a test was carried out using raw material A, and the ratio between the catalysts RHC-140 and RHC-131 filled in the hydrocracking reactor was 1:1. The ratio of fresh raw oil entering the hydrofinishing reactor and the hydrocracking reactor is 2:1, and all tail oil fractions are recycled back to the hydrocracking reactor. H in the reaction atmosphere of the hydrocracking reactor 2 S partial pressure is 0.074MPa, NH 3 The partial pressure is 0.018MPa. The test results are shown in Table 3. Based on 10...

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Abstract

The invention relates to a co-current flow hydrocracking method for increasing production of middle distillates. The method comprises the following steps that: fresh feedstock oils are simultaneously introduced into a hydrofining reactor and a hydrocracking reactor in a co-current flow way; the hydrocracking reactor is sequentially filled with an amorphous hydrocracking catalyst and a zeolite hydrocracking catalyst; a reaction effluent from the hydrofining reactor is separated to obtain light naphtha fractions, heavy naphtha fractions, middle distillates and tail oil fractions; and all or part of the tail oil fractions are introduced into the hydrocracking reactor, and a reaction effluent from the hydrocracking reactor and part of the feedstock oils are introduced into the hydrofining reactor together. According to the method provided by the invention, the heavy distillates can be treated, and the maximum production of the middle distillates can be realized.

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 胡志海董建伟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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