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Method for producing methane and co-producing low carbon alcohol from carbonaceous material

A low-carbon alcohol and carbon-based technology, applied in chemical instruments and methods, hydrocarbon production from carbon oxides, preparation of organic compounds, etc., can solve the problems of reducing carbon use efficiency, low catalyst efficiency, increasing energy consumption, etc. The effect of saving energy consumption, low equipment utilization rate and improving utilization rate

Inactive Publication Date: 2014-12-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the use of this dual-functional catalyst effectively solves the peak-shaving problem, it needs to be adjusted by the water-gas shift reaction before the syngas methanation reaction. 2 / CO molar ratio, in order to be suitable for the methanation reaction, thus increasing the energy consumption, there is a large amount of CO 2 emissions, reducing the efficiency of carbon use
In addition, the H required for the synthesis of lower alcohols 2 / CO molar ratio and the H required for the methanation reaction 2 / CO molar ratio is different, so the bifunctional catalyst cannot 2 / CO molar ratio operating conditions, resulting in lower catalyst efficiency

Method used

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  • Method for producing methane and co-producing low carbon alcohol from carbonaceous material
  • Method for producing methane and co-producing low carbon alcohol from carbonaceous material
  • Method for producing methane and co-producing low carbon alcohol from carbonaceous material

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This example is used to illustrate the method for producing methane and co-producing low-carbon alcohols from carbonaceous materials provided by the present invention.

[0048]Lignite fragments with a particle size of 5-50 mm (see Table 1 for chemical composition) are gasified into crude synthesis gas with oxygen / water vapor as a gasification agent, and the obtained crude synthesis gas is sequentially cooled, detarred, crude desulfurized, After the fine desulfurization process, the net syngas (see Table 2 for the composition) is obtained, in which (CO+H 2 ) content is 63% by volume, H 2 / CO molar ratio is 1.59;

[0049] The net synthesis gas is divided into two streams, G1 and G2. G1 is sent to the synthesis reactor after heat exchange and temperature rise, and is contacted and reacted with a fixed bed of mixed catalyst. The catalyst bed is composed of water gas shift catalyst and synthetic low-carbon alcohol The catalysts are mixed, and the mass ratio of the two is 3...

Embodiment 2

[0052] The preparation and composition of the net synthesis gas was the same as in Example 1. The entirety of this net synthesis gas is divided into two streams G1 and G2. Among them, G1 is sent to the synthesis reactor after heat exchange and temperature rise, and is contacted with the mixed catalyst fixed bed for reaction. The catalyst bed is formed by mixing the water gas shift catalyst and the synthetic low-carbon alcohol catalyst, and the mass ratio of the two is 4:1. , wherein the water gas shift catalyst is a Co-Mo catalyst (the manufacturer is Qingdao Lianxin Company, trade name QDB-03), and the composition of the synthetic low-carbon alcohol catalyst is: 50% by weight ZnO-47% by weight Cr 2 o 3 -3% by weight K 2 O; the inlet temperature of the composite reactor is 305°C, the outlet temperature is 342°C, the pressure is 10.33MPa, and the gas space velocity is 4500h -1 , the reacted product is cooled to 40°C by indirect heat exchange, and divided into gas stream G a...

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Abstract

A method for producing methane and co-producing low carbon alcohol from a carbonaceous material includes the steps: crude synthesis gas obtained after gasification of the carbonaceous material is purified to remove impurities in the crude synthesis gas, and thus purified synthesis gas is obtained; at least a portion of the purified synthesis gas and water are in contact with a mixed catalyst, a product obtained after contact is subjected to gas-liquid separation, and thus a gas product and a liquid product are obtained, wherein the mixed catalyst contains a water-gas shift catalyst and a catalyst for converting synthesis gas into low carbon alcohol; and a methanation gas raw material is in contact with a methanation catalyst, wherein the methanation gas raw material contains the gas product, and the H2 / CO molar ratio in the methanation gas raw material is 2.8-3.5. According to the method, the methane can be produced and the low carbon alcohol can be co-produced, moreover, the load of water-gas shift in the process is effectively reduced, the energy consumption is saved, the utilization efficiency of carbon is improved, and furthermore, the method is performed directly on a methane production device of the prior art without increasing equipment.

Description

technical field [0001] The invention relates to a method for indirect conversion of carbonaceous materials, more specifically, relates to a method for gasifying carbonaceous materials into synthesis gas, converting synthesis gas into methane gas and co-producing low-carbon alcohol. Background technique [0002] Based on energy endowment and national energy security considerations, China is actively promoting the strategy of "replacing oil with coal" to convert coal into civil gas, transportation fuel, and basic chemical raw materials. Among them, the coal-to-natural gas technology is the process of using low-rank lignite to produce synthetic gas through gasification, and then converting it into methane, which is used as a gas fuel to replace traditional natural gas. [0003] The coal-to-natural gas process has high energy efficiency, low water consumption, and relatively mature technology, which is of great significance for developing coal in remote areas of western China, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C1/04C07C31/02C07C29/151
Inventor 门秀杰崔德春徐庆虎于广欣刘倩熊亮
Owner CHINA NAT OFFSHORE OIL CORP
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