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Method for production of synthetic natural gas by utilization of methanol

A technology for synthesizing natural gas and methanol, which is applied in the production of bulk chemicals, gas fuels, petroleum industry, etc., can solve the problems of difficult control of process conditions, require staged reactions, and high requirements for reaction, and achieve significant economic and social benefits, The effect of single product component and low cost

Inactive Publication Date: 2016-08-03
王连成
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN103483119A discloses "a method for producing methane from hydrogen-rich synthesis gas". This method uses hydrogen-rich gas as the main raw material and methanol as an auxiliary material to synthesize natural gas through cracking and methanation. This method uses hydrogen-rich gas as the main raw material, and the cost is relatively high. Sectional reaction is required, the process is complicated, and the process conditions are difficult to control
Its disadvantages are: complex acid is used as catalyst, which has high requirements for the reaction, and the product is mixed gas. If single methane is required, subsequent separation process is required

Method used

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  • Method for production of synthetic natural gas by utilization of methanol
  • Method for production of synthetic natural gas by utilization of methanol
  • Method for production of synthetic natural gas by utilization of methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1, such as figure 1 As shown, after methanol and pure water are vaporized in the converter at a pressure of 0.5 MPa and a temperature of 300°C, the molar ratio of methanol to water is 1:1, and a copper-based catalyst is used, and the copper-based catalyst is CuZnAl Catalyst, the mass ratio of described methanol and copper-based catalyst is 3200:1, methanol cracking is hydrogen and carbon dioxide gas mixture I;

[0028] S2. Combine the mixed gas I obtained in S1 with the hydrogen-rich gas that has been purified and desulfurized according to the 3H 2 +CO→CH 4 +H 2 O and 4H 2 +CO 2 →CH 4 +2H 2 CO, CO in the O formula 2 The theoretical consumption of hydrogen is used for batching to obtain mixed gas II; the hydrogen-rich gas is coke oven gas, and the H contained in the hydrogen-rich gas 2 The quality of > CO and CO contained in hydrogen-rich gas 2 The total mass of hydrogen consumed in methanation theory;

[0029] S3. Send the mixed gas II with a good ratio of S...

Embodiment 2

[0034] S1, such as figure 1 As shown, after methanol and pure water are vaporized in the converter at a pressure of 0.3MPa and a temperature of 200°C, the molar ratio of methanol to water is 1:1, and a copper-based catalyst is used, and the copper-based catalyst is a CuZnAl catalyst , the mass ratio of the methanol to the copper-based catalyst is 3200:1, and the methanol is cracked into hydrogen and carbon dioxide gas mixture I;

[0035] S2. Combine the mixed gas I obtained in S1 with the hydrogen-rich gas that has been purified and desulfurized according to the 3H 2 +CO→CH 4 +H 2 O and 4H 2 +CO 2 →CH 4 +2H 2 CO, CO in the O formula 2 The theoretical consumption of hydrogen is used for batching to obtain mixed gas II; the hydrogen-rich gas is coke oven gas tail gas, and the H contained in the hydrogen-rich gas 2 The quality of > CO and CO contained in hydrogen-rich gas 2 The total mass of hydrogen consumed in methanation theory;

[0036] S3. Send the mixed gas II wi...

Embodiment 3

[0041] S1, such as figure 1 As shown, after methanol and pure water are vaporized in the converter at a pressure of 2.5MPa and a temperature of 250°C, the molar ratio of methanol to water is 1:1, and a copper-based catalyst is used, and the copper-based catalyst is CuZnAl Catalyst, the mass ratio of described methanol and copper-based catalyst is 3200:1, methanol cracking is hydrogen and carbon dioxide gas mixture I;

[0042] S2. Combine the mixed gas I obtained in S1 with the hydrogen-rich gas that has been purified and desulfurized according to the 3H 2 +CO→CH 4 +H 2 O and 4H 2 +CO 2 →CH 4 +2H 2 CO, CO in the O formula 2 The theoretical consumption of hydrogen is used for batching to obtain mixed gas II; the hydrogen-rich gas is methanol purge gas, and the H contained in the hydrogen-rich gas 2 The quality of > CO and CO contained in hydrogen-rich gas 2 The total mass of hydrogen consumed in methanation theory;

[0043] S3. Send the mixed gas II with a good ratio ...

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Abstract

A method for production of synthetic natural gas by the utilization of methanol comprises the following steps: methanol and pure water are vaporized, or in a converter and by the use of a copper-based catalyst, methanol is cracked into hydrogen and carbon dioxide or a gas mixture I of hydrogen and carbon monoxide; the gas mixture I and purified and desulphurized hydrogen rich gas are blended to obtain a gas mixture II according to theoretical hydrogen consumption of CO and CO2 in the formula of 3H2+CO--CH4+H2O and 4H2+CO2--CH4+2H2O; the gas mixture II is sent into a thermal-insulation multistage fixed bed and undergoes a methanation reaction under the action of a nickel-based catalyst to synthesize methane; and methane is purified by the utilization of pressure swing adsorption or membrane separation. The invention has the following advantages: the technology is simple; product composition is single; for enterprises of releasing coke oven gas and methanol, comprehensive utilization of hydrogen-rich gas is realized; the method is environmentally friendly; low-priced unsalable methanol is converted into high-priced best-selling natural gas; cost is low; and the method has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the field of natural gas preparation, in particular to a method for producing synthetic natural gas by utilizing methanol. Background technique [0002] China's natural gas market is not only poor, but also the distribution of resources is extremely uneven. Although some imported LNG receiving terminals have been established in coastal areas, the imbalance has improved, but in Heilongjiang, Jilin, Hunan, Hubei, Jiangxi, Yunnan, Guizhou, Sichuan and other places , natural gas prices remain high. However, the methanol industry has a serious overcapacity, and the price has continued to drop. In many places, it has fallen below 2,000 yuan per ton. It is of great significance to turn low-priced unsalable methanol into high-priced natural gas. [0003] CN103483119A discloses "a method for producing methane from hydrogen-rich synthesis gas". This method uses hydrogen-rich gas as the main raw material and methanol as an auxiliary mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10L3/10C07C9/04C07C1/04
CPCY02P20/52
Inventor 王连成王俊昌刘金刚陈云鹏高鹏翀
Owner 王连成
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