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Method for preparing C6-C8 aromatics with mixed aromatics containing polycyclic aromatic hydrocarbon and di-cyclic aromatic hydrocarbon

A technology for bicyclic aromatics and mixed aromatics, applied in the treatment of hydrocarbon oil, hydrocarbon oil treatment products, petroleum industry, etc., can solve the problems of oversaturation, reaction temperature unfavorable cracking reaction of aromatics, etc., to improve conversion efficiency, reduce equipment investment and operation Cost, the effect of efficient use of fossil resources

Inactive Publication Date: 2018-05-18
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, in the process of polycyclic aromatic hydrocarbons hydrocracking, lower reaction temperature is not conducive to the cracking reaction of aromatic hydrocarbons, and higher reaction temperature is likely to cause supersaturation under the hydrogenation atmosphere of polycyclic or bicyclic aromatic hydrocarbons.

Method used

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  • Method for preparing C6-C8 aromatics with mixed aromatics containing polycyclic aromatic hydrocarbon and di-cyclic aromatic hydrocarbon
  • Method for preparing C6-C8 aromatics with mixed aromatics containing polycyclic aromatic hydrocarbon and di-cyclic aromatic hydrocarbon
  • Method for preparing C6-C8 aromatics with mixed aromatics containing polycyclic aromatic hydrocarbon and di-cyclic aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of typical catalysts:

[0036] (1) Preparation of selective hydrogenation saturation catalyst Ni / SBA-15: Dissolve the weighed nickel nitrate hexahydrate in water, load it on the molecular sieve SBA-15 by equal volume impregnation method, then let it stand for 2h, at 60°C Dry at low temperature, repeat this process until the nickel nitrate aqueous solution is completely impregnated, and then dry at 120°C overnight to obtain Ni / SBA-15 impregnating agent. When in use, hydrogen reduction is first performed in the fixed bed of the selective hydrogenation saturation section, and the reduction condition is 500°C for 2 hours.

[0037] (2) Preparation of hydrocracking catalyst Pt / Y: Load the weighed aqueous solution of chloroplatinic acid onto the Y-type molecular sieve by equal volume impregnation method, then let it stand for 2 hours, and dry it at 60 ° C. Repeat this process Process until the chloroplatinic acid aqueous solution is completely impregnated, and then ...

Embodiment 2

[0039] Catalytic conversion experiment: The reaction is carried out in a reaction device composed of two fixed beds in series, or only in a fixed bed reactor in the hydrocracking section according to the raw material composition.

[0040] (1) Filling of selective hydrogenation saturated catalyst: Add a certain amount of selective hydrogenation saturated catalyst into the fixed bed reactor, and fill a certain amount of ceramic balls at both ends, so that the center of the catalyst is at the best hot spot of the fixed bed.

[0041] (2) loading of the hydrocracking catalyst: when the catalyst is a metal-acidic bifunctional catalyst, the loading method is described in (1) in Example 2; when the catalyst is a mixed catalyst system composed of a hydrogenation catalyst and a molecular sieve acid catalyst , first mix the two catalysts, and then fill them in the manner described in (1) in Example 2.

[0042] Typical reaction conditions: After the catalyst has been reduced and cooled, t...

Embodiment 3

[0049] The mixed aromatics raw material containing polycyclic aromatic hydrocarbons is a reformed heavy aromatics, and its qualitative analysis results by chromatography and mass spectrometry are shown in Table 1.

[0050] Table 1. Chromatographic and mass spectrometric analysis results of certain reformed heavy aromatics

[0051]

[0052] As can be seen from the results in Table 1, C in the raw material 6 ~C 8 The total content of aromatics is only 0.07%, and the C element is mainly C 9 + component present, C 9 + The content is as high as 99.68%. Mass spectrometry analysis shows that the raw material is mainly composed of aromatics, with a content as high as 96.6%, of which the contents of monocyclic and bicyclic aromatics are 47.5% and 42.0%, respectively, and the content of polycyclic aromatics is 7.1%. The high aromatic content of raw oil has certain advantages for the preparation of BTX.

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Abstract

The invention discloses a method for preparing C6-C8 aromatics with mixed aromatics containing polycyclic aromatic hydrocarbon and di-cyclic aromatic hydrocarbon. The method comprises the steps that the mixed aromatics containing polycyclic aromatic hydrocarbon and di-cyclic aromatic hydrocarbon serves as a reactive material in a series reactor composed of two sections of fixed beds, selective hydrogenation saturation is conducted at 200-380 DEG C, a hydrocracking reaction is conducted at 300-450 DEG C, and the C6-C8 aromatics is prepared; two reactions sequentially adopt a metal catalyst withthe catalytic hydrogenation function and a metal hydrogenation acid catalyst system with the catalytic cracking function, and on the conditions that the system reaction pressure is larger than or equal to 0.5 MPa, the two section bed mass airspeed is larger than or equal to 0.5 h<-1>, the two section reactor oil hydrogen ratio is larger than or equal to 300, and the two section reactor reflux ratio is larger than or equal to 0, the method is achieved through two-step catalytic transformation. Compared with an existing BTX industrial synthetic route, according to the route, the reaction material sources are sufficient, the cost is low, and the technological process has the advantages of being high in target product yield, simple in catalyst preparation, moderate in reaction condition and not harsh in equipment requirement, and liquid products and catalysts are easy to separate.

Description

technical field [0001] The invention belongs to the field of aromatics preparation, in particular to a method for preparing C from mixed aromatics containing polycyclic and bicyclic aromatics 6 ~C 8 A method for aromatics, specifically, a process for efficiently preparing high-value-added aromatic compounds such as benzene, toluene, and xylene (BTX) from mixed aromatics composed of monocyclic, bicyclic, and polycyclic aromatics. Background technique [0002] Catalytic reforming in the refining process will produce by-products rich in C 9 + Heavy mixed aromatics of aromatics, where C 9 + Aromatic hydrocarbons refer to aromatic hydrocarbons containing ≥ 9 carbon atoms in the molecule. With the continuous mining and consumption of fossil resources, these by-products have the characteristics of a large number of polycyclic aromatic hydrocarbons. At present, in terms of the utilization of by-products, a small part of them can be obtained by rectification and extraction, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/02
CPCC10G65/02C10G2300/1096C10G2300/4006C10G2400/30
Inventor 周立坤臧甲忠于海斌范景新成宏
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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