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Method for preparing aromatic hydrocarbon by aromatizing methane and special-purpose reaction system thereof

A reaction system and aromatization technology, applied in the direction of condensation hydrocarbon production with dehydrogenated hydrocarbons, organic chemistry, etc., can solve the problems of energy consumption, useless hydrogen, high separation cost, etc., and achieve cost reduction, cost reduction, and shortened process Effect

Active Publication Date: 2013-04-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the separation cost is relatively high and energy-consuming
At the same time, in a specific system, the generated hydrogen is useless, and its storage is a very big problem

Method used

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  • Method for preparing aromatic hydrocarbon by aromatizing methane and special-purpose reaction system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, methane aromatization prepares aromatics

[0032] exist figure 1 The preparation was carried out in the reaction system shown.

[0033] 1) Fill the aromatization catalyst (such as: Mo / ZSM-5, the mass fraction of Mo is 6%) into the methane aromatization fluidized bed reactor, raise the temperature to 700 ° C, and then pass methane into the fluidized bed reactor The reaction is carried out in the bed reactor, and the space velocity of methane is controlled to be 1000L / (gcat·h). The generated aromatics, hydrogen and unconverted methane exit the methane aromatization reaction system from the outlet of the fluidized bed reactor. When the carbon deposition of the aromatization catalyst is greater than 3%, it will be moved to the catalyst regeneration fluidized bed reactor for regeneration through pipelines and delivery devices (the regeneration medium is air, and the regeneration temperature is controlled to be 500 ° C), so that the carbon content of the cataly...

Embodiment 2

[0037] Embodiment 2, methane aromatization prepares aromatics

[0038] 1) Fill the aromatization catalyst (such as: Mo / ZSM-5, the mass fraction of Mo is 6%) into the methane aromatization fluidized bed reactor, raise the temperature to 680°C, and then feed methane into the fluidized bed reactor Bed reactor for reaction, control the space velocity of methane to 1500L / (gcat h), the generated aromatics, hydrogen and unconverted methane exit the methane aromatization reaction system from the outlet of the fluidized bed reactor. When the aromatization catalyst When the carbon deposit is greater than 3%, it will be transferred to the catalyst regeneration fluidized bed reactor for regeneration through pipelines and conveying devices (the regeneration medium is air, and the regeneration temperature is controlled at 560°C), so that the carbon content of the catalyst is lower than 0.1%. , transported back to the methane aromatization fluidized bed reactor through pipelines and delivery...

Embodiment 3

[0042] Embodiment 3, methane aromatization prepares aromatics

[0043] exist figure 1 The preparation was carried out in the reaction system shown.

[0044] 1) Fill the aromatization catalyst (such as: Ni / Mo / ZSM-5, the mass fractions of Ni and Mo are 2%, 4% respectively) into the methane aromatization fluidized bed reactor, and heat up to 700°C , and then feed methane into the reaction, control the space velocity of methane to 1500L / (gcat h), the generated aromatics, hydrogen and unconverted methane exit the methane aromatization reaction system from the outlet of the fluidized bed reactor. When the carbon deposit of the structured catalyst is greater than 3%, it will be moved to the catalyst regeneration fluidized bed reactor for regeneration (the regeneration medium is air, and the regeneration temperature is controlled to be 550° C.) through pipelines and conveying devices, so that the carbon content of the catalyst is lower than After 0.1%, it is transported back to the ...

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Abstract

The invention discloses a method for preparing aromatic hydrocarbon by aromatizing methane and a special-purpose reaction system thereof. In the method, aromatic hydrocarbon is separated from the outlet gas of the methane aromatization reaction system, residual tail gas (methane containing about 20 percent of hydrogen) and CO2 carry out methanation reaction on supported metal catalyst in a fluidized bed, so that the tail gas is changed into methane and water again, hydrogen is almost completely converted, and after the water is separated, the methane can be recycled. The technique not only effectively solves the problem that the cost of separating methane from hydrogen is high in the process of independent aromatization, but also can effectively utilize CO2 to produce aromatic hydrocarbon, the process is shortened, the investment is less, the material cost is low, and thereby the cost of preparing aromatic hydrocarbon is greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing aromatics by methane aromatization and a special reaction system thereof. Background technique [0002] Benzene and other aromatic products are important basic chemical raw materials, and currently they are mainly by-products in the petroleum refining process. Recently, as the global crude oil price continues to rise and the demand for aromatics downstream products increases, the prices of benzene and other aromatics remain high. my country's oil resources are short, there is a large demand gap for vehicle oil (gasoline, diesel, kerosene and lubricating oil, etc.), and the demand for ethylene, propylene, butadiene is strong, so the production of aromatics from petroleum routes is increasingly restricted. In order to meet the sharp increase in the demand for benzene and other aromatics in the production of various chemical and chemical products in my country, it is very necessary to find a suitable non-pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/76C07C15/04C07C15/00
Inventor 骞伟中魏飞恽松张金贵
Owner TSINGHUA UNIV
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