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A low-energy hydrocracking method for processing inferior raw materials

A technology for hydrocracking and low-quality feedstock oil, which is applied in the fields of hydroprocessing technology, petroleum industry, hydrocarbon oil treatment products, etc., and can solve the problems of large circulation volume of kerosene fraction, increased equipment investment, complicated operation, etc. Small size, few units used, large heat transfer area

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

However, this method needs to increase more equipment, and the circulation of kerosene fraction is relatively large, which increases the investment of the device, and the operation is more complicated

Method used

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  • A low-energy hydrocracking method for processing inferior raw materials

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Embodiment 1～3

[0038] use figure 1 Process flow chart shown. The hydrotreating reactor uses FF-46 hydrocracking pretreatment catalyst, and the hydrocracking reactor adopts a catalyst system with hydrocracking catalyst I / hydrocracking catalyst II graded in different volume ratios. Catalyst Ⅰ and catalyst Ⅱ are both supported by amorphous silica-alumina and modified Y molecular sieve. In Examples 1-3, the volume ratios of hydrocracking catalyst I / hydrocracking catalyst II are 3:2, 1:1 and 2:3 respectively, and the properties of the raw oil are shown in Table 1.

[0039] At a reaction pressure of 15.7MPa, the volume ratio of hydrogen to oil in the refining section and the cracking section is 900:1 and 1200:1 respectively, and the volume space velocity of the refining section and the cracking section are 1.0h -1 and 1.2h -1 Under the conditions of > 350 ° C, the process test with a conversion rate of about 80wt% was carried out, and the product quality of each fraction was investigated.

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Abstract

The present invention discloses a low energy consumption hydrocracking method for processing a poor-quality raw material. According to the method, a raw material and hydrogen gas are mixed, are subjected to heat exchange two times, pass through a heating furnace, and then are subjected to a hydrorefining reaction; the refining effluent is subjected to separation and fractionation; the obtained tail oil enters a hydrocracking reaction zone, wherein the cracking reaction zone comprises at least two cracking catalysts, the upstream is a catalyst I, the downstream is a catalyst II, the catalyst I contains 15-50 wt% of a modified Y molecular sieve, the catalyst II contains 3-30 wt% of the modified Y molecular sieve, and the modified Y molecular sieve content in the catalyst I is 10-25% higher than the modified Y molecular sieve content in the catalyst II; and the hydrocracking effluent and poor-quality raw material oil are mixed and then enter a hydrorefining reaction zone. 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 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 low-energy hydrocracking method for processing inferior raw materials to obtain high-quality jet fuel and ultra-low sulfur diesel oil. Background technique [0002] As the market demand for middle distillates continues to increase, refineries are required to produce more middle distillates. The new fuel standard puts forward stricter requirements on the indicators of gasoline and diesel. Obviously, primary processing methods and FCC technology can no longer meet the market's requirements for clean fuels. The hydrocracking process is not only a secondary processing method to lighten heavy raw materials, but also an important means to obtain high-quality jet fuel and clean diesel from inferior raw materials. [0003] In recent years, with the worldwide shortage of crude oil resources and the increasingly inferior quality of crude oil, the properties of raw materials processed by hydrocr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/12
CPCC10G65/12C10G2400/04
Inventor 彭冲王仲义崔哲曾榕辉孙士可石友良
Owner CHINA PETROLEUM & CHEM CORP
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