Method and device for catalyzing methanation of synthesis gas

A synthesis gas and methanation technology, applied in organic chemistry, hydrocarbon production from carbon oxides, etc., can solve the problems of uneconomical and universality, high price of aromatic hydrocarbons, and achieve enlarged production efficiency and high reaction space velocity. , enhance the effect of contact

Active Publication Date: 2010-09-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the heat extraction method in this process is relatively novel, the price of aromatic hydrocarbons is relatively high, and the benzene, toluene or naphthalene in the claims are all terminal products required by the market. It is not economical and economical to consume these high-value substances to obtain heat. universality

Method used

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  • Method and device for catalyzing methanation of synthesis gas
  • Method and device for catalyzing methanation of synthesis gas
  • Method and device for catalyzing methanation of synthesis gas

Examples

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Embodiment 1

[0041] This embodiment is the method for catalytic methanation of syngas provided by the present invention, the fluidized bed reactor used adopts built-in gas-solid separator, and the specific device is as figure 1 shown.

[0042] The catalysts that are applied to the fixed bed and fluidized bed evaluation of the device of the present invention are all N182 methanation catalysts (purchased from Japan Nikki Catalyst Chemical Co., Ltd.), and Ni and Mg are active components in this catalyst, and alumina is a carrier. The fluidized bed catalyst adopts a spherical particle catalyst with a particle diameter of 40-100 μm, and the fixed bed catalyst adopts a columnar catalyst with a diameter and a height of 3 cm.

[0043] The composition and content of the reaction products were analyzed by Agilent Micro3000 gas chromatograph. The reaction conversion rate is calculated according to the following formula:

[0044] Conversion rate (%) = the amount of converted CO / the raw material amou...

Embodiment 2

[0047] This example is the method for catalytic methanation of synthesis gas provided by the present invention, the fluidized bed reactor used adopts an external gas-solid separator, and the specific device is as figure 2 shown.

[0048] The reaction operating conditions and experimental results are the same as in Example 1, the only difference being that the gas-solid separator is external, that is, the prepared synthesis gas enters the fluidized bed reactor 3 after being uniformly distributed by the gas distributor. The intermediate product of the reaction in the fluidized bed reactor 3 is quickly separated from the catalyst through the external gas-solid separator 5, and the separated gas intermediate product is condensed through the heat exchanger 6 and the gas-liquid separator 7 and the water in it is separated , the mixed gas enters the fixed-bed reactor unit, and the separated solid catalyst flows into the fluidized-bed reactor for recycling.

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Abstract

The invention relates to a method and a device for catalyzing methanation of synthesis gas. The method has the process characteristics that synthesis gas as a raw material firstly realizes the conversion rate of 60 to 95% in a built-in heat exchanger type fluid bed reactor, the reaction temperature is from 200 to 700 DEG C, the pressure is from 0.1 to 6.0 MPa, and the reaction airspeed is from 1000 to 50000 h<-1>; gas-solid separation is carried out on reaction products and a catalyst, and water therein is separated and enters a fixed bed reactor after temperature raise; and the rest raw material synthesis gas is converted to methane, the operation temperature is from 180 to 700 DEG C, the pressure is from 0 to 6.0 MPa, the reaction airspeed is from 500 to 600h<-1>, and the final raw material synthesis gas conversion rate reaches more than 98%. Compared with the fixed bed reactor adiabatic reaction process generally adopted currently, the process of the method has simpler process flow. The space time yield of the methane can be obviously improved, and the invention has better industrialized application value.

Description

technical field [0001] The invention belongs to the field of chemical reaction process design and application thereof, and relates to the process technology of an exothermic reaction system in a fluidized bed and a fixed bed coupling reactor. Specifically, it is a new process method for catalytic methanation of syngas. Background technique [0002] my country's energy structure of "rich coal but little gas" and the distribution characteristics of coal "poor in the east and rich in the west" require that the conversion of coal into gaseous fuel will be more economical and efficient in transportation. However, the gas produced by the traditional coal gasification technology contains more CO, which is not suitable for direct use as urban residential gas and other power and heating fuels due to its low calorific value and the toxicity of CO. However, when the synthesis gas obtained from coal gasification is converted into methane, the following two main reactions take place: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C1/04
Inventor 许光文李强王莹利余剑汪印董利
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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