Hydrocracking method for increasing production of high-quality middle distillates

A technology for middle distillate oil and hydrocracking, applied in the field of hydrocracking, can solve the problem of low selectivity of middle distillate oil, and achieve the effects of protecting activity and selectivity, maintaining activity stability and improving conversion depth.

Active Publication Date: 2012-12-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a hydrocracking method for increasing the production of high-quality middle distillate oil on the basis of the prior art, so as to solve the problem of low selectivity of middle distillate oil in the hydrocracking method of the prior art

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  • Hydrocracking method for increasing production of high-quality middle distillates

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Embodiment 1

[0037] 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 375°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 that the present invention provides, adopt raw material A to carry out test. The volume ratio between RN-32V and RHC-140 loaded in the hydrofinishing reactor is 3:1; the volume ratio between RN-32V and RHC-131 loaded in the hydrocracking reactor is 1:4. The ratio of fresh raw oil entering the hydrorefining 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 ...

Embodiment 2

[0039] 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 that the present invention provides, adopt raw material A to carry out test, the ratio of the RN-32V of hydrorefining reactor filling and RHC-140 catalyst is 1: 1; The volume ratio between catalyst RN-32V and RHC-131 is 1:2. The ratio of the fresh raw oil entering the hydrorefining reactor and the hydrocracking reactor is 1.5:1, 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 0.06MPa, NH 3 The partial pressure is 0.014MPa. T...

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Abstract

The invention relates to a hydrocracking method for increasing production of high-quality 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 hydrofining reactor is sequentially filled with a hydrofining catalyst and an amorphous hydrocracking catalyst; the hydrocracking reactor is sequentially filled with a hydrofining catalyst and a zeolite hydrocracking catalyst; a reaction effluent from the hydrofining reactor is separated to obtain light naphtha fractions 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 Applications(China)
IPC IPC(8): C10G67/00
Inventor 陈元君胡志海董建伟董松涛赵阳王子文龙湘云聂红
Owner CHINA PETROLEUM & CHEM CORP
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