Technical method for preparing low-carbon mixed alcohol and natural gas by synthetic gas one-step method from coal

A low-carbon mixed alcohol and synthesis gas technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of low catalyst activity, low synthesis efficiency, ring pollution, etc., and improve carbon utilization rate , reduce carbon emissions, and reduce the effect of low-level heat energy generation

Pending Publication Date: 2021-06-11
山西华顿实业有限公司
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  • Abstract
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Problems solved by technology

Nowadays, when synthesizing low-carbon mixed alcohols, the synthesis efficiency is low and the activity of the catalyst selected in the synthesis process is low and unstable, and no other catalyst with high activity has been found, and the exhaust gas generated at the end is too much, and it is generally discharged to In the air, it is easy to cause ring pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present invention is a technical method for preparing low-carbon mixed alcohol and natural gas by using coal through syngas one-step method, and its specific steps are:

[0020] First, the coal is gasified, and then the gas is purified. After purification, desulfurization is carried out by chemical absorption method to obtain the synthesis gas composed of hydrogen and carbon;

[0021] Carrying out the preparation of catalyst, prepare the CNTs as support material, CNTs supports Co-Cu-K sulfide-based catalyst, prepare and carry out by conventional capacity impregnation method, promptly: will measure K 2 CO 3 Dissolve in metered deionized water to make an aqueous solution, which is slowly added dropwise on metered CNTs, and the impregnated material is dried at 373K, N 2 573K roasting 2 hours under the protection of air flow, then cooled to room temperature, then containing metered (NH 4 ) 6 Cu 7 o 24 4H 2 The water solution of O was slowly added dropwise on the a...

Embodiment 2

[0024] Use ordinary coal to prepare low-carbon mixed alcohol and natural gas. Firstly, the coal is gasified, and then the gas is purified. After purification, it is desulfurized by chemical absorption method to obtain synthesis gas composed of hydrogen and carbon; the flow rate of coal synthesis gas is 20Nm 3 / h, the molar composition is: CO 2 9.1%, H 2 57.8%, CO 2 0.5%, CH 4 12.4%, the rest is inert component N 2 and Ar; the coal is passed through the synthesis gas into a low-carbon mixed alcohol reactor for reaction, the reaction temperature is 230°C, the pressure is 8.0MPa, the volume space velocity is 2000h-1, H 2 The molar ratio of / CO is 2.1, and the catalyst for synthesizing low-carbon mixed alcohol is made of Cu, Cr 2 o 3 、K 2 Composed of O and ZnO, the molar ratio of the metal elements of each component is Cu:Cr:K:Zn=30:15:15:40; the gas after the reaction is condensed and separated to obtain low-carbon mixed alcohol and tail gas, and the tail gas pressure is 7....

Embodiment 3

[0027] Use ordinary coal for low-carbon mixed alcohol and natural gas preparation, first gasify the coal, then purify the gas, and then desulfurize the gas by chemical absorption to obtain the synthesis gas composed of hydrogen and carbon;

[0028] Coal-based syngas flow rate is 20Nm 3 / h, the molar composition is: CO 2 9.1%, H 2 57.8%, CO 2 0.5%, CH 4 12.4%, the rest is inert component N 2 and Ar; feed the coal-based synthesis gas into a low-carbon alcohol synthesis reactor for reaction, the reaction temperature is 200°C, the pressure is 8.0MPa, the volume space velocity is 2000h-1, H 2 The molar ratio of / CO is 2.1, and the catalyst for synthesizing low carbon alcohol is made of Cu, Cr 2 o 3 、K 2Composed of O and ZnO, the molar ratio of the metal elements of each component is Cu:Cr:K:Zn=35:15:10:40; the gas after the reaction is condensed and separated to obtain low-carbon alcohol and tail gas, and the tail gas pressure is 7.7MPa , the flow rate is 15.01Nm 3 / h, the...

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Abstract

The invention provides a technical method for preparing low-carbon mixed alcohol by a synthetic gas one-step method from coal, which comprises the following specific steps that coal is gasified, the gas is purified, and desulfurizing is conducted by a chemical adsorption method to obtain synthetic gas consisting of hydrogen and carbon; then the synthetic gas is in contact with a Cu-based sulfide catalyst under the condition of high pressure for a catalytic reaction, the reacted gas is subjected to heat exchange, condensation and liquid separation, a liquid-phase component and tail gas are obtained, the liquid-phase component is low-carbon mixed alcohol, and the low-carbon mixed alcohol mainly containing alcohols and a small amount of C1-C4 gaseous hydrocarbon are generated through catalytic synthesis. According to the method, the coal is used as the raw material to synthesize the low-carbon mixed alcohol, the final products are the low-carbon mixed alcohol and the C1-C4 gaseous hydrocarbon, the low-carbon mixed alcohol is used as the chemical raw material, the C1-C4 gaseous hydrocarbon is used as the fuel, the final products are not wasted, and pollution is avoided. The Cu-based sulfide catalyst is used as the catalyst, such that the disadvantage of low activity of the existing catalyst is changed, and the production speed of the low-carbon mixed alcohol is improved.

Description

technical field [0001] The invention belongs to the technical field of preparing alcohols from coal through synthesis gas, and in particular relates to a technical method for preparing low-carbon mixed alcohol and natural gas in one step by utilizing coal through synthesis gas. Background technique [0002] With the continuous development of the national economy, China's energy supply problem has become increasingly prominent. Since my country has a unique energy structure of "rich coal, poor oil and little gas", the development of coal chemical industry is of great significance to solve the problem of my country's dependence on foreign crude oil imports. At this stage, the processes of coal-to-synthesis gas, coal-to-synthesis gas to natural gas, and synthesis gas to methanol are relatively mature and have been applied industrially in my country. However, the products of these processes have disadvantages such as low added value and poor anti-risk ability of device operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/156C07C31/02C07C31/08C07C31/10C07C31/12C10K1/00B01J27/043
CPCC10K1/004C10K1/002C07C29/156B01J27/043C07C31/02C07C31/08C07C31/10C07C31/12
Inventor 常永龙吴跃曲张晓峰刘东彪孙茂华
Owner 山西华顿实业有限公司
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