Method and system for preparing methanol from biogas through dry reforming

The method of preparing methanol through dry reforming of biogas has solved the problems of large industrial consumption and low carbon utilization in the existing process, and achieved efficient and green methanol production, reducing costs and improving biogas utilization.

CN120271414APending Publication Date: 2025-07-08GAOLU AIR PROD & CHEM (SHANGHAI) ENERGY TECH
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Patent Information

Application Number
CN202410017557.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-01-05
Publication Date
2025-07-08

AI Technical Summary

Technical Problem

The existing biogas methanol production process has problems such as large industrial consumption, low carbon utilization rate and mismatch of materials, resulting in small effective capacity of the reactor, and the traditional coal-to-methanol production has high energy consumption, high carbon emissions and environmental risks.

Method used

The method of preparing methanol through dry reforming of biogas includes pressurization, desulfurization, dry reforming, hydrogen-carbon ratio adjustment and methanol synthesis. The methane carbon dioxide dry reforming reaction is directly carried out by desulfurization biogas. The methanol synthesis reaction is reacted with methanol synthesis through tandem reforming technology, and combined with the electrolytic water process to provide green hydrogen and green oxygen to achieve the preparation of green methanol.

Benefits of technology

It has achieved efficient biogas utilization, and the methane utilization rate has reached more than 99%, reducing the investment and operating costs of the device, realizing negative carbon emissions of green methanol, and improving process flexibility and economic benefits.

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Abstract

The invention provides a method and a system for preparing methanol from biogas through dry reforming, and the method comprises the following steps: sequentially carrying out pressurization operation and desulfurization operation on the biogas to obtain desulfurized biogas, and introducing the desulfurized biogas into a dry reforming reactor; introducing oxygen into the dry reforming reactor, and carrying out methane and carbon dioxide dry reforming reaction in the presence of a catalyst to obtain a first synthesis gas mixture; performing heat exchange operation on the first synthesis gas mixture, performing flash separation to obtain first synthesis gas, and performing hydrogen-carbon ratio adjustment operation on the first synthesis gas to obtain second synthesis gas; the second synthesis gas is subjected to a methanol synthesis reaction after being subjected to pressurization operation and preheating operation, and finally methanol is obtained after flash evaporation operation and rectification operation. The method is simple in process flow, high in operability, flexible in hydrogen-carbon ratio adjustment and high in biogas utilization rate, so that the whole process is more efficient, the operation cost is saved, and the economic benefit can be improved.
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