A method for co-producing low-carbon alcohols by producing methane from carbonaceous materials

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 problems such as low catalyst efficiency, reduce carbon use efficiency, increase energy consumption, etc., and achieve The effect of low utilization rate of equipment, saving energy consumption and improving utilization rate

Inactive Publication Date: 2016-06-01
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 problem of peak regulation, it needs to undergo water-gas shift to adjust H 2 / CO molar ratio, so that the methanation reaction occurs appropriately, thus increasing the energy consumption, and at the same time, there is a large amount of CO 2 emissions, reducing the efficiency of carbon use
In addition, the reaction to generate lower alcohols requires H 2 / CO molar ratio and H required for methanation reaction 2 / CO molar ratio is different, making the polygeneration catalyst unable to operate at its optimal H 2 / CO molar ratio operating conditions, resulting in lower catalyst efficiency

Method used

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  • A method for co-producing low-carbon alcohols by producing methane from carbonaceous materials
  • A method for co-producing low-carbon alcohols by producing methane from carbonaceous materials
  • A method for co-producing low-carbon alcohols by producing methane from carbonaceous materials

Examples

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Effect test

Embodiment 1

[0050] 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.

[0051] 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;

[0052] The net synthesis gas is divided into two stocks, G1 and G2. Among them, G1 is sent to the reactor for synthesizing low-carbon alcohols after heat exchange and heating, and is combined with the catalyst for synthesizing low-carbon alcohols (composition: 40% by weight CuO-37% by weight co 2 o 3 -21wt%MnO-2wt%K 2 O) Contact reaction to obtain the con...

Embodiment 2

[0056] 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. Wherein, G1 is sent in the synthesis low-carbon alcohol reactor after heat exchange and temperature rise, and the catalyst of synthesis low-carbon alcohol (composition: 50% by weight ZnO-47% by weight Cr 2 o 3 -3% by weight K 2 O) Bed contact reaction. Among them, the inlet temperature of the synthesis reactor is 350°C, the outlet temperature is 391°C, the pressure is 13.52MPa, 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 and liquid stream L a Two parts (see Table 3 for weight ratio), gas stream G a Medium (H 2 +CO) content of 55% by volume, H 2 / CO molar ratio is 2.01, liquid flow L a The proportion of medium and low carbon mixed alcohols is 92% by weight;

[0057] G2 is sent to the water-gas shift reactor...

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Abstract

The invention provides a method for producing methane and co-producing low carbon alcohol from a carbonaceous material, wherein the method 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 is in contact with a catalyst for converting synthesis gas into low carbon alcohol, a product obtained after contact is subjected to gas-liquid separation, and thus a gas product and a liquid product are obtained; and a methanation gas raw material is in contact with a methanation catalyst, wherein the methanation gas raw material contains the gas product or contains the water-gas shifted gas after the gas product is subjected to water-gas shift, 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, and the utilization efficiency of carbon is improved.

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 Patents(China)
IPC IPC(8): C07C1/04C07C9/04C07C31/02C07C29/151
Inventor 崔德春门秀杰徐庆虎刘倩熊亮于广欣
Owner CHINA NAT OFFSHORE OIL CORP
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