Process for synthesizing green methanol through low-pressure and high-temperature steam gasification of pure biomass

Through low-pressure, high-temperature steam gasification process and supercritical steam ionization technology, combined with multi-stage cyclone separation and MDEA desulfurization and decarbonization, the problems of high tar content and low activated carbon by-product rate in biomass gasification have been solved, and high-purity methanol synthesis and environmentally friendly methanol production have been achieved.

CN120757437APending Publication Date: 2025-10-10ZHEJIANG HANBO ENERGY EQUIP CO LTD
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Patent Information

Application Number
CN202510817328.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-18
Publication Date
2025-10-10

AI Technical Summary

Technical Problem

Existing biomass gasification technology has problems such as high tar content, nitrogen dilution of synthesis gas, low gas production efficiency and low activated carbon by-product rate, which increases the cost of methanol production.

Method used

A low-pressure, high-temperature steam gasification process is used, combined with supercritical steam ionization technology to decompose tar precursors, multi-stage cyclone separators and water scrubbers are used to remove impurities, MDEA desulfurization and decarbonization technology is used to purify synthesis gas, and high-purity methanol is synthesized using a copper-based catalyst. The activated carbon separation system includes a three-stage cyclone separator and a high-temperature activation furnace to produce activated carbon with a high specific surface area.

Benefits of technology

It achieves tar-free gasification, high-purity synthesis gas, high carbon conversion rate, increased revenue from activated carbon by-products, reduced methanol production costs, and no wastewater or waste gas emissions throughout the entire process, making it environmentally friendly.

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Abstract

The invention discloses a process for synthesizing green methanol by low-pressure and high-temperature steam gasification of pure biomass. The process comprises the following steps: S1, raw material pretreatment; s2, low-pressure and high-temperature gasification; under the conditions that the temperature is 1000 DEG C and the pressure is smaller than 0.05 MPa, steam reacts with biomass to generate synthesis gas, the synthesis gas comprises H, CO and CO, a tar precursor is ionized and decomposed by supercritical steam, and tar-free gasification is achieved; s3, washing the synthesis gas; a multi-stage cyclone separator and a water washing tower are adopted to remove fly ash and water-soluble impurities; s4, pressurizing and purifying; pressurizing to 2MPa for the first time, entering an MDEA desulfurization and decarburization system, and removing HS and COO to a ppm level; carrying out secondary pressurization to 5.2 MPa, and feeding into a methanol synthesis module; s5, methanol synthesis and rectification; synthesizing crude methanol under the action of a copper-based catalyst, and carrying out three-tower differential pressure rectification to obtain green methanol with the purity of more than or equal to 99.9%; s6, activated carbon separation. The process has the characteristics of low tar and nitrogen, high carbon conversion rate, outstanding economical efficiency and environmental friendliness.
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