A method for carbon dioxide capture and hydrogenation synthesis of methanol based on deep eutectic solvent

Methanol is prepared by in-situ hydrogenation of the absorbent in a eutectic solvent, which solves the problems of high energy consumption and low conversion rate in traditional processes. It achieves low-temperature and high-efficiency conversion of carbon dioxide into methanol, and the solvent is easy to regenerate, making it suitable for carbon capture and utilization.

CN118026814BActive Publication Date: 2026-06-09BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Filing Date
2024-02-19
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing technologies for producing methanol by carbon dioxide hydrogenation, the capture process has high energy consumption, the desorption process has high energy consumption, and the conversion rate is low, making it difficult to meet the needs of industrial applications.

Method used

Methanol is prepared by absorbing carbon dioxide in a eutectic solvent and then hydrogenating it in situ in the absorbent. The synergistic effect of the alkaline functionalized eutectic solvent and the catalyst is utilized to activate carbon dioxide to prepare methanol. The reaction temperature is low, the conversion rate is high, and the solvent is easy to regenerate.

Benefits of technology

It reduces energy consumption, increases the single-pass conversion rate of carbon dioxide, simplifies the process flow, increases the yield of methanol, and allows the solvent to be recycled.

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Abstract

The application provides a method for carbon dioxide capture and hydrogenation synthesis of methanol based on a eutectic solvent, and belongs to the technical field of carbon capture and utilization. The method comprises the following steps: weighing acetyl guanidine and ethylene glycol according to a proportion, mixing the acetyl guanidine and the ethylene glycol, stirring to prepare a eutectic solvent at a given temperature, capturing carbon dioxide in flue gas by using the eutectic solvent to form a rich liquid, transferring the rich liquid into a high-pressure reaction kettle, adding a catalyst, filling in hydrogen, increasing the temperature to perform a carbon dioxide hydrogenation reaction, filtering to obtain a catalyst and a mixture of the eutectic solvent and methanol after the reaction, and performing flash evaporation on the mixture to obtain product methanol and regenerated eutectic solvent. After capturing carbon dioxide in the flue gas, the method directly performs in-situ carbon dioxide hydrogenation in the absorbent to prepare methanol, avoids problems such as high energy consumption of carbon dioxide desorption, high reaction temperature and low single-pass conversion rate in a traditional gas-solid phase reaction process, and has a simple process and easy regeneration of the eutectic solvent.
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