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Method for preparation of furfural by biomass microwave mild pyrolysis

A technology of biomass and biomass raw materials, applied in the direction of organic chemistry, can solve the problems of large amount of waste water, high yield, low yield, etc., and achieve the effect of short production cycle, low pyrolysis temperature and short production cycle

Active Publication Date: 2013-10-16
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is environmentally friendly, low energy consumption, and high yield, and can solve the shortcomings of the prior art such as large amount of wastewater, serious pollution, and low yield.

Method used

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  • Method for preparation of furfural by biomass microwave mild pyrolysis
  • Method for preparation of furfural by biomass microwave mild pyrolysis
  • Method for preparation of furfural by biomass microwave mild pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Crush the rice straw to about 0.5mm, dip it in a sulfuric acid aqueous solution with a mass fraction of 5% for 10 minutes, dry it at 40°C to remove free water, and carry out charging and microwave gentle pyrolysis according to the above operation process, in which the inert gas used is Nitrogen (flow rate: 100ml / min), the reaction temperature (pyrolysis temperature) of mild pyrolysis is 150°C, stop the reaction after 20 minutes of reaction (pyrolysis), the collected liquid is post-treated as above, and quantified by gas chromatography Analysis shows that the total mass fraction of furfural in the upper and lower layers of liquid product is 38.5%.

Embodiment 2

[0037] Crush the corn stalks to about 1.0 mm, soak them in 8% phosphoric acid aqueous solution for 30 minutes, dry them at 60°C to remove free water, carry out the charging and microwave gentle pyrolysis according to the above operation process, and the inert gas used Argon gas (flow rate: 250ml / min), the reaction temperature (pyrolysis temperature) of mild pyrolysis is 200°C, stop the reaction after 20 minutes of reaction (pyrolysis), and carry out post-treatment on the collected liquid as above, and pass through the gas phase Chromatographic quantitative analysis shows that the total mass fraction of furfural in the upper and lower liquid products is 40.3%.

Embodiment 3

[0039] Crush poplar wood chips to about 1.5 mm, soak them in 10% sulfuric acid aqueous solution for 20 minutes, dry at 50°C to remove free water, and carry out charging and microwave gentle pyrolysis according to the above operation process. Among them, the inert The gas is argon (the flow rate is 200ml / min), the reaction temperature (pyrolysis temperature) of mild pyrolysis is 250°C, the reaction (pyrolysis) is stopped after 15 minutes, and the collected liquid is post-treated as above, after Quantitative analysis by gas chromatography showed that the total mass fraction of furfural in the upper and lower liquid products was 42.7%.

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Abstract

The invention discloses a method for preparation of furfural by biomass microwave mild pyrolysis. The method includes: 1) pretreating a biomass raw material by an inorganic acid catalyst or an inorganic salt catalyst; 2) taking microwave as a heat source, conducting mild pyrolysis on the biomass raw material pretreated in step 1), and subjecting the pyrolytic gas to condensation, thus obtaining furfural. The method provided in the invention has the advantages of simple process, high processing efficiency, short procedure and easy operation, short production cycle, and low cost.

Description

technical field [0001] The invention relates to a method for preparing furfural, in particular to a method for preparing furfural by utilizing biomass microwave mild pyrolysis. Background technique [0002] The scientific name of furfural is α-furfuraldehyde, and its molecular formula is C 5 h 4 o 2 , whose structural formula is shown in S-1, with a boiling point of 161.7°C. It is an important chemical raw material. It can not only be used as an extraction agent in the petrochemical industry, but also can be used for refining petroleum, refining lubricating oil, refining grease and dissolving nitrocellulose, etc. , It is also a raw material and reagent for pharmaceuticals and various organic synthesis. [0003] [0004] At present, furfural is mainly hydrolyzed from agricultural and forestry wastes such as corn cobs and bagasse. Using inorganic acid or salt as a catalyst, hemicellulose is first hydrolyzed into pentose sugars, and then acid-catalyzed dehydration to gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/50
Inventor 王小泉罗虎孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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