Method for coproducing 5-hydroxymethyl furfural, 4-vinylphenol and bio-oil by multi-stage pyrolysis of corn stalk

A technology of hydroxymethylfurfural and vinyl phenol, which is applied in the field of biomass energy utilization and can solve problems that have not been reported

Active Publication Date: 2015-04-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no report on the direct preparation of 5-hydroxymethylfurfural by using lignocellulosic biomass as raw material and pyrolysis as a technical means; while there has been a report on the direct preparation of 4-vinylphenol (application number 201110134872.3 Chinese patent); but the biomass pyrolysis polygeneration technology with 5-hydroxymethylfurfural, 4-vinylphenol and bio-oil as target products has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The corn stalks in the milk ripening stage are used as raw materials, and the particles with an average particle size of 1.5 mm are selected as raw materials after drying and crushing. Under nitrogen atmosphere, 100g raw material is first pyrolyzed at 250°C for 10s, and after gas-solid separation, the pyrolysis gas is condensed to obtain a first-level pyrolysis liquid product; then the solid particles are pyrolyzed at 330°C for 10s, and the gas-solid After separation, the pyrolysis gas is condensed to obtain a secondary pyrolysis liquid product; finally, the solid particles are pyrolyzed at 500°C for 2 seconds, and after gas-solid separation, the pyrolysis gas is condensed to obtain a third-stage pyrolysis liquid product (bio-oil) .

[0024] Analysis of the primary pyrolysis liquid product determined a 3.2% yield of 5-hydroxymethylfurfural; analysis of the secondary pyrolysis liquid product determined a 3.8% yield of 4-vinylphenol; analysis of bio-oil , its moisture co...

Embodiment 2

[0026] Corn stalks in the grain formation stage are used as raw materials, and particles with an average particle size of 1.5 mm are selected as raw materials after drying and crushing. Under nitrogen atmosphere, 100g raw material is firstly pyrolyzed at 270°C for 8s, and after gas-solid separation, the pyrolysis gas is condensed to obtain a first-level pyrolysis liquid product; then the solid particles are pyrolyzed at 350°C for 7s, and the After separation, the pyrolysis gas is condensed to obtain a secondary pyrolysis liquid product; finally, the solid particles are pyrolyzed at 500°C for 2 seconds, and after gas-solid separation, the pyrolysis gas is condensed to obtain a third-stage pyrolysis liquid product (bio-oil) .

[0027] Analysis of the primary pyrolysis liquid product determined a 3.0% yield of 5-hydroxymethylfurfural; analysis of the secondary pyrolysis liquid product determined a 3.9% yield of 4-vinylphenol; analysis of bio-oil , its moisture content is 11%, an...

Embodiment 3

[0029] Corn stalks in the milky stage are used as raw materials, and particles with an average particle size of 1.0 mm are selected as raw materials after drying and crushing. Under nitrogen atmosphere, 100g raw material is firstly pyrolyzed at 240°C for 15s, after gas-solid separation, the pyrolysis gas is condensed to obtain a first-level pyrolysis liquid product; then the solid particles are pyrolyzed at 360°C for 10s, and the After separation, the pyrolysis gas is condensed to obtain a secondary pyrolysis liquid product; finally, the solid particles are pyrolyzed at 480°C for 2 seconds, and after gas-solid separation, the pyrolysis gas is condensed to obtain a third-stage pyrolysis liquid product (bio-oil) .

[0030] Analysis of the primary pyrolysis liquid product determined a 3.1% yield of 5-hydroxymethylfurfural; analysis of the secondary pyrolysis liquid product determined a 4.1% yield of 4-vinylphenol; analysis of bio-oil , its moisture content is 11%, and its calori...

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Abstract

The invention discloses a method for coproducing 5-hydroxymethyl furfural, 4-vinylphenol and bio-oil by multi-stage pyrolysis of corn stalk, belonging to the technical field of biomass energy utilization. The method comprises the following steps of: conducting rapid pyrolysis on corn stalk under anaerobic condition at 220-180 DEG C, 300-380 DEG C and 450-550 DEG C respectively; and after gas-solid separation, condensing a pyrolysis gas so as to respectively obtain a liquid product which is rich in 5-hydroxymethyl furfural, a liquid product which is rich in 4-vinylphenol and bio-oil. The method is simple in process; a method for high-valued utilization of the corn stalk is provided; and meanwhile a way for producing 5-hydroxymethyl furfural and 4-vinylphenol on a large scale is developed, and at the same time high-quality bio-oil is coproduced.

Description

technical field [0001] The invention belongs to the technical field of biomass energy utilization, and in particular relates to a method for coproducing 5-hydroxymethylfurfural, 4-vinylphenol and bio-oil by multi-stage pyrolysis of corn stalks. Background technique [0002] Lignocellulosic biomass raw materials will mainly form a liquid product called bio-oil under medium-temperature (~500°C) rapid pyrolysis reaction conditions, which contains a variety of liquid chemicals with high added value in chemical or pharmaceutical applications. However, the chemical composition of conventional bio-oil is extremely complex, and the content of most of the substances is extremely low, which makes the separation and extraction of specific chemicals not only technically difficult, but also not very economical. In order to enrich specific target chemicals in liquid products, specific biomass feedstocks can be selected and the pyrolysis process can be controlled to obtain specific bio-oil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/46C07C39/20C07C37/54C10B53/02C10G1/00
CPCY02E50/14Y02E50/10
Inventor 陆强张俊姣叶小宁董长青杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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