Hydrocracking method for blending ethylene tar

A technology of ethylene tar refining and hydrocracking, which is applied in the field of light fuel oil produced by hydrocracking of vacuum gas oil blended with ethylene tar, can solve the problems of not being effectively treated and unable to process ethylene tar fractions, and achieve safety Smooth operation is beneficial, equipment investment is saved, and the effect of reducing aromatics content

Active Publication Date: 2011-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only utilizes the light fraction which accounts for a small proportion in ethylene tar, and more than 80% of the ethylene tar fraction has not been effectively treated; at the same time, the hydrorefining conditions it provides cannot handle ethylene with a boiling point higher than 280 ° C. tar fraction

Method used

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  • Hydrocracking method for blending ethylene tar
  • Hydrocracking method for blending ethylene tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0043] The properties of the ethylene tar light fraction and VGO raw materials used are shown in Table 2.

[0044] The hydrogenation protection catalyst used in this example is FZC-103, and the hydrogenation refining catalyst used is 3936. This embodiment adopts a series hydrogenation process, two reactors, the first reactor is filled with a hydrogenation protection catalyst and a hydrofining catalyst, and the second reactor is filled with a hydrogenation carbon removal catalyst and a hydrocracking catalyst. Embodiments 1 and 3 adopt thermal low fraction oil circulation, and the weight ratio of the heat low fraction oil recycled back to the hydrogenation reaction zone to the sum of the ethylene tar light fraction and heavy fraction is 2.0. Example 2 adopts hot high-fraction oil circulation, and the weight ratio of the heat high-fraction oil recycled back to the hydrogenation reaction zone to the sum of the ethylene tar light fraction and heavy fraction is 2.0. Embodiment 4 ad...

Embodiment 5

[0055] The heavy fraction of ethylene tar is heat-treated at 380°C under normal pressure for 20 minutes to obtain mesophase pitch; the mesophase pitch is melt-spun with a pneumatic spinning machine, and the spun pitch fiber is oxidized by air at 300°C-400°C to form The fibers were not melted, and then carbonized into carbon fibers at 1000°C under nitrogen. The properties of the obtained pitch-based carbon fibers are shown in Table 5.

[0056] Table 4 Properties of ethylene tar heavy fraction

[0057] crude oil name

Ethylene tar heavy fraction (>430°C)

carbon to hydrogen ratio

1.07

Softening point / ℃

225

Quinoline insoluble matter / %

0.60

[0058] Table 5 Properties of pitch-based carbon fibers

[0059] project

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Abstract

The invention discloses a hydrocracking method for blending ethylene tar, which comprises the following steps of: blending light fraction of ethylene tar into heavy distillate for hydrocracking, and contacting a hydrogenation protecting catalyst, a hydrogenation refining catalyst, a hydrogenation carbon residue removing catalyst and a hydrocracking catalyst in the presence of hydrogen to obtain hydrocracking crude oil, wherein partial hydrocracking crude oil is circulated and mixed with the light fraction and heavy distillate of the ethylene tar to enter a hydrocracking area, and the rest hydrocracking crude oil is future separated to obtain light fuel oil. By the method, the problem of high temperature rise of a hydrogenation reactor bed can be effectively solved; meanwhile, a method of grading the hydrogenation catalysts, the light fraction of the ethylene tar can be processed, and diesel with high cetane number and low condensation point and naphtha with high potential aromatic content can be produced; and compared with a state that the ethylene tar is not blended, the method has the advantage that the bureau of mines correlation index (BMCI) value of tail oil and the smoke point of jet fuel are not obviously changed.

Description

technical field [0001] The invention relates to a method for producing clean fuel by hydrogenation treatment of ethylene tar, in particular to a method for production of light fuel oil by hydrocracking of vacuum gas oil (VGO) blended with ethylene tar. Background technique [0002] The increasing shortage of world oil resources and the increasing price make it necessary for refineries to reduce emissions and increase efficiency. Ethylene tar is currently mainly sold as heavy fuel oil or carbon black raw materials, with low added value. [0003] Ethylene tar is a high-temperature condensation product of raw materials and products in the steam cracking process of ethylene cracking raw materials. Its initial boiling point is 170-260°C, and its final boiling point is >600°C, generally 600-700°C. It belongs to the heavy fraction range. Ethylene tar is mainly a mixture of double-ring and above condensed-ring aromatics, the content of aromatics is more than 90%, and the density ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
Inventor 许杰
Owner CHINA PETROLEUM & CHEM CORP
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