A cryogenic methanol wash unit for transforming gas

By designing a low-temperature methanol washing device, the pre-wash methanol is circulated separately and separated efficiently, solving the problem of main washing methanol contamination, improving system stability and energy efficiency, and reducing energy consumption and investment.

CN224442588UActive Publication Date: 2026-07-03天津德瑞化工技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
天津德瑞化工技术有限公司
Filing Date
2025-06-24
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In the existing low-temperature methanol washing process, the mixing of pre-wash methanol and main wash methanol leads to contamination of the main wash methanol, affecting its ability to absorb sulfur and carbon, causing the system to deteriorate, and even failing to meet desulfurization and decarbonization standards.

Method used

Design a low-temperature methanol washing device, including components such as an absorption tower, an extraction tank, and an azeotropic tower. The device uses pre-wash methanol for separate circulation to avoid mixing with the main washing methanol, and uses a high-efficiency extraction tower to replace the complex extractor to achieve separate circulation and separation of methanol.

Benefits of technology

It improves the washing capacity of the main methanol wash, ensures the stability of the low-temperature methanol washing system, reduces energy consumption and investment, reduces the footprint, and removes impurity solutions.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application provides a low-temperature methanol washing device for shift gas, including an absorption tower. The absorption tower includes a pre-washing section, one side of which is connected to a shift gas feed pipeline. The bottom of the pre-washing section is sequentially connected to an extraction device, an azeotropic tower, and a methanol water tower. A methanol water tower reflux device is installed at the top of the methanol water tower, and the methanol water tower reflux device is connected to the pre-washing section of the absorption tower through a pre-washed methanol circulation pipeline. After the pre-washed methanol in this application is treated, it is no longer mixed with the main washing methanol. This portion of methanol is circulated back and used separately as pre-washed methanol, so that the main washing methanol is not contaminated, the washing capacity of the main washing methanol is improved, and the stability of the entire low-temperature methanol washing system is guaranteed. Because the methanol in the pre-washing section is circulated separately through this application, and the amount of methanol used is relatively small, the impurity solution is removed, and the energy consumption is low.
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