Hydrocracking method for blending ethylene tar
A technology for refining ethylene tar and hydrocracking, which is applied in the field of producing light fuel oil by hydrocracking of vacuum gas oil blending ethylene tar, can solve the problems of not being effectively treated, unable to treat ethylene tar fractions, etc., and achieves safety The smooth operation is beneficial, the equipment investment is saved, and the effect of reducing the content of aromatic hydrocarbons
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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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