Sulfur tolerant catalyzing process for preparing low carbon alcohol from synthesis gas and co-producing natural gas

Abstract

The invention relates to a sulfur tolerant catalyzing process for preparing low carbon alcohol from synthesis gas and co-producing natural gas, which comprises the following steps: performing a synthetic reaction by contacting the synthesis gas with a sulfur tolerant low carbon alcohol synthetic catalyst after the synthesis gas is subjected to coarse desulphurization; condensing the synthetic product to obtain a liquid phase of alcohol-water-oil and a tail gas mixture consisting of CO, H2, CO2, C1-C5 hydrocarbon, performing a low carbon alcohol synthesis reaction on a part of the tail gas mixture for recycling, and performing methanation on the other part of the tail gas mixture; separating oil from water in the liquid phase of the alcohol-water-oil to obtain an oil product and alcohol water, and separating alcohol from water in the alcohol-water mixture to obtain low carbon alcohol and water; performing methanation on the tail gas in the presence of the sulfur tolerant methanation catalyst and under the condition of methane conversion; condensing a methanation product to obtain a liquid phase of oil and alcohol water and a gas containing CH2, CO2, CO, H2, C2-C5 hydrocarbon, and performing the methanation on a part of the gas mixture of CH4, CO2, CO, H2, C2-C5 hydrocarbon for recycling; and sending the other part of the gas mixture to a CO2 separation device, and separating CO2 to obtain an SNG. The process has the advantages of having simple steps and low cost, organically coupling the low carbon alcohol synthesis process with the methanation process, improving the carbonutilization rate and realizing co-production and complementation of the low carbon alcohol and the natural gas.

Description

technical field [0001] The invention relates to a low-carbon alcohol synthesis process, in particular to a process for producing low-carbon alcohol and co-producing natural gas from synthesis gas under the action of a sulfur-resistant catalyst. Background technique [0002] Low carbon mixed alcohol refers to C 1 -C 6 The alcohol mixture has a wide range of uses. First of all, low-carbon alcohol itself is a good clean fuel. Secondly, low-carbon alcohols can be used as fuel additives such as gasoline due to their advantages such as high octane number, high calorific value, anti-explosion and shock resistance, good miscibility with gasoline, and reduced formaldehyde content in exhaust gas after combustion. Thirdly, low-carbon mixed alcohols can be separated to obtain products such as A, B, C, B, and amyl alcohol, which can be used as synthetic raw materials for other chemical products. The research on the direct synthesis of low-carbon mixed alcohols from syngas began in 19...

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Problems solved by technology

After searching, no method was found to produce low-carbon alcohol and co-produce natural gas from syngas under the action of sulfur-resistant catalyst

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