Method for preparing biomass-based methanol

Abstract

The invention provides a method for preparing biomass-based methanol, which comprises the following steps: a) cracking biomass to form biological oil vapor and biomass carbon powder; b) performing gas-solid separation of the biological oil vapor and performing a water vapor reforming reaction to obtain a biological oil reformed synthesis gas; c) grinding and mixing the biomass carbon powder, a catalyst and a bonding agent, drying the mixture, performing a reduction reaction by using hydrogen, heating the product of the reduction, performing a coal gasification reaction and a reverse coal gasification reaction of the product of the reduction and the biological oil reformed synthesis gas, condensing and drying the obtained mixed gas to obtain biomass reformed-modified synthesis gas; and d) performing a synthesis reaction of the biomass reformed-modified synthesis gas, condensing the obtained reaction tail gas, and obtaining the biomass-based methanol from a liquid product. The method can effectively convert a biomass-based synthesis gas into the biomass-based methanol, uses the rich, environmentally-friendly and renewable biomass as a raw material, achieves high methanol yield and selectively, makes reaction conditions mild and can be used for industrial production.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing biomass-based methanol. Background technique [0002] Energy is an important pillar for human survival and sustainable social and economic development. With the rapid growth of energy demand and the pressure of environmental protection, the use of renewable biomass energy has attracted great attention. The "White Paper on Population, Environment and Development in China in the 21st Century" pointed out: "We must develop and utilize renewable energy. Clean new energy and new resources should be placed in the priority position of the national energy development strategy, and the development of biomass energy should be strengthened." The United Nations Conference on Environment and Development predicts that by 2050, the use of biomass energy will account for about half of global energy consumption. Biomass has become a promising raw material for the productio...

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Problems solved by technology

[0004] Biomass-based methanol synthesis is to use bio-oil catalytic reforming or biomass gasification to obtain biomass-based synthesis gas, and then obtain biomass-based methanol through catalytic synthesis from biomass-based synthesis gas. The biggest advantage of this method is that it has renewable raw materials. , Low sulfur content in the product, no CO 2 The advantages of emission and not being limited by the type of biomass, the synthesis of biomass-based methanol is still in the research and development stage, and the key technical problem to be solved is to improve the methanol yield and product selectivity

Although the use of renewable biomass to produce biomass-based methanol is a circular green economic model, it is more economical and applicable to countries or regions lacking oil resources, but due to the actual biomass-based syngas It is complex and related to the type of biomass raw material, synthesis gas production reaction process, carrier gas, reaction conditions and other factors, generally including H 2 , CO, CO 2 , a variety of hydrocarbons (such as CH 4 、C 2 h 4 ) and moisture, especially the biomass-based syngas produced by bio-oil reforming contains a high proportion of CO 2 (CO 2 The volume concentration can reach 20vol%-35vol%, CO 2 The ratio of volume concentration to CO volume concentration is 6.33, patent: CN101177239A; CN101306370; CN200910116098.6), it is necessary to solve the problem of producing biomass-based methanol from carbon dioxide-rich syngas; The methanol yield and selectivity obtained by the material-based syngas to methanol process are low [Document: Xiuli Yin and Dennis Y.C.Leung, Energy & Fuels 2005, 19, 305-310], far below the level of industrial production

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