Method for preparing arene by directly converting methane

A technology for methane and aromatic hydrocarbons, applied in the field of direct conversion of methane to aromatic hydrocarbons, can solve the problems of low catalyst activity, limited effect, catalyst deactivation, etc., and achieves the advantages of inhibiting the formation of oligomeric condensed aromatic hydrocarbons, prolonging the service life and improving the conversion rate. Effect

Inactive Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequently, studies have shown that Mo is the best active component for this reaction, but there are problems to be solved urgently in this reaction: the activity of the catalyst is not high and carbon deposition leads to rapid deactivation of the catalyst
However, due to the limitation of the thermodynamic properties of the reaction, the effects of these improved methods are very limited

Method used

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  • Method for preparing arene by directly converting methane
  • Method for preparing arene by directly converting methane
  • Method for preparing arene by directly converting methane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The carrier of catalyst of the present invention can adopt existing commercial goods, also can directly prepare by following method:

[0029] Take 16.288g template agent tetrapropylammonium hydroxide (TPAOH), add 42.084g water, stir on a magnetic stirrer at room temperature, then add 1.8757g aluminum nitrate, stir until completely dissolved, then add 20.833g orthosilicate dropwise Ethyl ester (TEOS) with constant stirring, after being fully hydrolyzed, stirred for 20 hours, left to stand and aged for 4 hours, the resulting synthetic solution was slowly poured into a stainless steel autoclave lined with polytetrafluoroethylene, and sealed. Then put the stainless steel autoclave in an oven at 120°C for crystallization for 120 hours, take it out, and cool it down to room temperature. The obtained product was repeatedly washed with deionized water until the pH value was 9-10, and the solid product was separated by centrifugation. The obtained product was dried in an oven at...

Embodiment 2

[0031] The carrier of catalyst of the present invention can adopt existing commercial goods, also can directly prepare by following method:

[0032]Take 16.288g template agent tetrapropylammonium hydroxide (TPAOH), add 42.084g water, stir on a magnetic stirrer at room temperature, then add 0.9378g aluminum nitrate, stir until completely dissolved, then add 20.833g orthosilicate dropwise Ethyl ester (TEOS) with constant stirring, after being fully hydrolyzed, stirred for 20 hours, left to stand and aged for 4 hours, the resulting synthetic solution was slowly poured into a stainless steel autoclave lined with polytetrafluoroethylene, and sealed. Then put the stainless steel autoclave in an oven at 120°C for crystallization for 120 hours, take it out, and cool it down to room temperature. The obtained product was repeatedly washed with deionized water until the pH value was 9-10, and the solid product was separated by centrifugation. The obtained product was dried in an oven at ...

Embodiment 3

[0034] The carrier of catalyst of the present invention can adopt existing commercial goods, also can directly prepare by following method:

[0035] Take 16.288g template agent tetrapropylammonium hydroxide (TPAOH), add 42.084g water, stir on a magnetic stirrer at room temperature, then add 0.7504g aluminum nitrate, stir until completely dissolved, then add 20.833g orthosilicate dropwise Ethyl ester (TEOS) with constant stirring, after being fully hydrolyzed, stirred for 20 hours, left to stand and aged for 4 hours, the resulting synthetic solution was slowly poured into a stainless steel autoclave lined with polytetrafluoroethylene, and sealed. Then put the stainless steel autoclave in an oven at 120°C for crystallization for 120 hours, take it out, and cool it down to room temperature. The obtained product was repeatedly washed with deionized water until the pH value was 9-10, and the solid product was separated by centrifugation. The obtained product was dried in an oven at...

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Abstract

Disclosed is a method for preparing an aromatic hydrocarbon by direct conversion of methane, comprising the following steps: a catalyst is placed in one reactor, at the same time, a mixed gas of CH4 and an alkylating agent is introduced for reaction, thus implementing coupling of two reactions to acquire the aromatic hydrocarbon. The beneficial effect of the present invention is such that: the present invention is capable of increasing significantly the conversion rate of methane and the yield of the aromatic hydrocarbon, inhibiting the generation of an oligomeric polycyclic aromatic hydrocarbon, and extending the service life of the catalyst. The method of the present invention allows for reaction within 30 minutes and keeps the conversion rate steady between 25% and 45%. When the reaction time reaches 1200 hours, the conversion rate is kept steady, while the catalyst still remains active. An anaerobic aromatization reaction of methane and an alkylation reaction of the aromatic hydrocarbon are conducted simultaneously, thus implanting heat coupling. The temperatures, space velocities, and raw materials of the two reactions are coordinated within a certain scope. The types of post-reaction products remain unchanged, thus facilitating analysis and comparison. Benzene and toluene are consumed in the reactions, while xylene and mesitylene are generated, which are of higher values.

Description

technical field [0001] The invention relates to a method for directly converting methane to produce aromatics, in particular to a method for directly converting methane to produce aromatics by simultaneously carrying out an oxygen-free aromatization reaction of methane and an alkylation reaction of aromatic hydrocarbons. Background technique [0002] Methane is the main component of natural gas and coal gas beds. The rapid development of unconventional natural gas resources "shale gas" has changed the world's energy structure, and the development and utilization of natural gas has become a research hotspot. At present, natural gas is mainly used for heating and power generation. Natural gas used in industry accounts for 22%, and chemical products using natural gas as raw material account for 5%. This is a huge waste of resources. The oxygen-free aromatization of methane is one of the important ways for the direct conversion of methane. Under the action of a catalyst, methane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C15/02C07C2/76C07C2/86
CPCC07C2/84C07C2/864C07C2529/46C07C2529/48C07C2529/78Y02P20/52C07C15/04C07C15/08C07C15/02C07C15/06
Inventor 张燚刘洋陈建峰
Owner BEIJING UNIV OF CHEM TECH
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