A method for improving the stability of catalysts for lightening heavy aromatics

A technology for lightening heavy aromatics and catalysts, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of severe carbon deposition and poor stability of catalysts, achieve low additional cost, improve stability, highly operable effect

Active Publication Date: 2016-04-20
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem of severe carbon deposition in the prior art and poor catalyst stability, and to provide a method for improving the stability of catalysts for lightening heavy aromatics

Method used

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  • A method for improving the stability of catalysts for lightening heavy aromatics
  • A method for improving the stability of catalysts for lightening heavy aromatics

Examples

Experimental program
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Embodiment

[0022] This example illustrates the method of the present invention for improving the stability of a catalyst for hydrogenation and lightening of heavy aromatics.

[0023] Load and reduce the catalyst according to the method of the comparative example, enter the oil for reaction, and take samples for analysis. When the reaction was carried out for 120 hours, valves 1 and 3 were quickly opened, valves 2 and 4 were closed, and the reaction continued without changing other conditions.

[0024] The liquid phase analysis result of comparative example and embodiment is summarized in table 1:

[0025] Table 1

[0026]

[0027] The comparative example and the embodiment adopt the same catalyst and reduction treatment, so the composition of the product before 120h is basically the same. And after 144h, the C10+ content in the embodiment is lower than the comparative example product, the single-ring aromatic hydrocarbon content is high, and the bicyclic and tricyclic content are lo...

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Abstract

The invention discloses a method for improving stability of a heavy aromatic light catalyst. The method relates to heavy aromatic light reaction in the presence of a molecular sieve catalyst and hydrogen. The method comprises the following steps: 1) under the effect of the light catalyst, converting heavy aromatics into light fractions such as benzene, methylbenzene, dimethylbenzene and C9 aromatic hydrocarbon with high additional values, wherein the temperature in a reactor is 300-400 DEG C, the reaction pressure is 2.0-4.0MPa and the weight hourly space velocity of the hydrocarbon raw materials is 0.5-1.5 / h; and 2) after a period of time in the step 1), reversing the feeding direction, maintaining other conditions unchanged and continuing to react. The method disclosed by the invention can remarkably improve the stability of the heavy aromatic hydrogenation light catalyst and prolong the one-way service life of the catalyst; and moreover, the additional value is extremely low and the maneuverability for device revamping is strong.

Description

technical field [0001] The invention relates to a method for improving the stability of a catalyst for lightening heavy aromatics. Background technique [0002] Heavy aromatics generally refer to single-ring and fused-ring alkyl aromatics above C9 produced by reforming, disproportionation, and isomerization reactions to produce oil and ethylene cracking hydrogenated gasoline. At present, about 1.7 million tons of C10+ heavy aromatics are produced by aromatics reforming units nationwide. With the increase of refining capacity, the production of heavy aromatics will also increase significantly. [0003] For a long time, heavy aromatics resources have not been rationally utilized. The more common utilization method of blending C10+ heavy aromatics into diesel accounts for more than 70% of the utilization rate of heavy aromatics resources. However, with the increasingly stringent diesel standards, the blending scheme has gradually lost its advantages, and the economics of usin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C15/06C07C15/08C07C15/02C07C4/18
CPCY02P20/52
Inventor 范景新李健于海斌王春雷臧甲忠王凌涛周立坤王梦迪李佳李响
Owner CHINA NAT OFFSHORE OIL CORP
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