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Method for preparing furfural, polyether polyalcohol, phenolic resin and nanometer silicon dioxide from straw

A nano-silica, polyether polyol technology, applied in the direction of silica, silicon oxide, nanotechnology, etc., can solve the problems of waste of fiber resources, etc., achieve efficient clean conversion, narrow relative molecular weight distribution of products, and substrate conversion high rate effect

Inactive Publication Date: 2011-08-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct combustion makes the abundant fiber resources in biomass wasted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Get 1000g of corn stalks with a water content of 30% for steam explosion pretreatment, soak the steam-exploded corn stalks with 1000g of water for 30min, filter and collect the steam-exploded washing liquid; air-dry the steam-exploded corn stalks after washing and control its The water content is 40%, and then put it into a mechanical carding machine for grading treatment to obtain rich cell components and lignocellulosic components; then cook the lignocellulosic components with dilute alkali solution, then filter and wash to obtain fiber-rich components points, and the filtrate is added with acid to precipitate to obtain the lignin component.

[0025] Add 1000g of steam explosion washing solution and 8g of H-ZSM-5 solid acid catalyst into the reaction kettle, cover and seal it, heat up to 160°C for 120min, collect furfural vapor generated by the reaction simultaneously and collect furfural by condensation to obtain 72g furfural is 64% of the theoretical y...

Embodiment 2

[0030] Example 2: Add 1000 g of steam explosion washing liquid and 80 g of phosphoric acid into the reaction kettle together, cover and seal, heat up to 180 ° C for 100 min, and collect the furfural vapor generated by the reaction synchronously and collect furfural by condensation to obtain 69 g of furfural, which is 61% of the theoretical yield (based on the content of pentose in the washing solution).

[0031] All the other are the same as embodiment 1

Embodiment 3

[0032] Example 3: Take 1000g of wheat straw with a water content of 50% for steam explosion pretreatment, soak the steam-exploded wheat straw with 2000g of water for 15min, filter and collect the steam-exploded washing liquid; air-dry the washed and steam-exploded wheat straw and control its water content 60%, and then put it into a mechanical carding machine for grading treatment to obtain cell-rich components and lignocellulosic components; then cook the lignocellulosic components with dilute alkali solution, then filter and wash to obtain fiber-rich components, The filtrate is added with acid to precipitate to obtain the lignin component.

[0033] Mix 2000g of steam explosion water lotion and 60g of S 2 o 8 2- / ZrO 2 -SiO 2 Add the solid acid catalyst into the reaction kettle together, cover and seal it, heat up to 180°C and react for 100 minutes, collect the furfural vapor generated by the reaction synchronously and collect furfural by condensation to obtain 110g furfu...

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Abstract

The invention relates to a comprehensive utilization process of the classification conversion of straw. The process is characterized in that the straw is split selectively and structurally by the combined pretreatment technology in which steam explosion is taken as a core to form hemicellulose-enriched washing liquor, a hybrid-cell-enriched component, a cellulose-enriched component and a lignin component; and steam explosion washing liquor is catalyzed directly to form furfural, the hybrid-cell-enriched component is burned to form nanometer silicon dioxide, the cellulose-enriched component and the lignin component are liquefied respectively to form plant-based polyether polyalcohol, and the lignin component is also used for preparing phenolic resin further. In the method, the furfural is prepared by a two-step method, so the conversion rate is improved; a solid acid catalyst also can be used repeatedly, and the cellulose-enriched component and the lignin component are liquefied respectively, so the conversion rate of a substrate is improved; and the relative molecular weight of the polyether polyalcohol is distributed narrowly, so the polyether polyalcohol can be used for preparing high-quality polyurethane materials. By the method, the problems of low conversion efficiency, secondary pollution and the like during the utilization of the integral plant of the straw are solved, and the high-efficiency cleaning conversion of the straw is realized.

Description

technical field [0001] The invention relates to a comprehensive utilization process for preparing furfural, polyether polyol, phenolic resin and nano silicon dioxide through graded transformation of straw. Background technique [0002] Straw is mainly composed of three major components: cellulose, hemicellulose and lignin. Cellulose is a straight-chain polysaccharide with glucose monomers connected by β-1,4 glycosidic bonds. Hemicellulose is mainly xylose and a small amount of arabic acid. Sugar, galactose, mannose, and lignin is a high-molecular aromatic compound composed of phenylpropane and its derivatives as the basic unit. These three components are intertwined and wrapped layer by layer to form a complex network. structure, and compared with lignocellulosic resources such as wood, straw has a high ash content, of which more than 60% is silica. These complex structures and compositions support and protect the normal growth and metabolism of crops, but at the same time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/50C08G65/34C08G65/28C08G8/28C01B33/12B82Y40/00
Inventor 陈洪章于彬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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