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Rapid liquefaction method for corps wastes by microwave heating catalysis

A microwave heating and waste technology, applied in the field of crop waste utilization, can solve the problems of low efficiency, long liquefaction time, high cost, etc., and achieve the effect of cost reduction and fast operation

Active Publication Date: 2012-07-25
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the liquefaction technology of straw biomass mainly adopts oil bath heating (90-200° C.) to catalyze the liquefaction of straw, and the liquefaction time is relatively long, usually 1-2 hours (CN101172932A, CN101186559A, CN101186560A, etc.), using cheap ethylene glycol as The liquefaction yield is only 60-70% when the liquefaction agent is used, and the liquefaction yield can only reach 80-90% if the polyethylene glycol or ethylene carbonate with higher price is used. Therefore, the traditional liquefaction technology has long liquefaction time, low efficiency, Disadvantages such as high cost are not conducive to large-scale application

Method used

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  • Rapid liquefaction method for corps wastes by microwave heating catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Crush corn stalks to 40 mesh, weigh 6 g of corn stalk powder, add 20 g of liquefier ethylene glycol and 0.7 g of catalyst 98% concentrated sulfuric acid, that is, the mass of straw is 30% of the mass of liquefier, and the concentrated sulfuric acid is 3.5% of the mass of liquefier , set the microwave temperature at 160°C, the microwave power at 600W, adopt a closed microwave heating method, and magnetically stir the liquefaction reaction for 25 minutes to obtain the corn stalk liquefaction product biomass polyol.

[0019] After testing, the liquefaction rate of corn stalks reached 94.6% under the liquefaction conditions.

Embodiment 2

[0021] Crush corn stalks to 40 mesh, add liquefaction agent polyethylene glycol 400 and glycerol 4:1 (v / v) mixture and catalyst 98% concentrated sulfuric acid to corn stalk powder, the quality of liquefaction agent is 25g, and the quality of straw is the quality of liquefaction agent The concentrated sulfuric acid is 3.5% of the mass of the liquefaction agent, the microwave temperature is set at 150°C, the microwave power is 400W, and the closed microwave heating is adopted, and the liquefaction reaction is carried out by magnetic stirring for 20 minutes to obtain the corn stalk liquefaction product biomass polyol.

[0022] After testing, the liquefaction rate of corn stalks reached 92.4% under the liquefaction conditions.

Embodiment 3

[0024] Corncobs are pulverized to 40 mesh, liquefaction agent ethylene glycol and catalyst 98% concentrated sulfuric acid are added to the corncob powder, the quality of the liquefaction agent is 250g, the quality of the corncobs is 20% of the quality of the liquefaction agent, and the concentrated sulfuric acid is 5.0% of the quality of the liquefaction agent , set the microwave temperature at 150°C, the microwave power at 1000W, adopt closed microwave heating, and magnetically stir the liquefaction reaction for 20 minutes to obtain the corncob liquefaction product biomass polyol. Under this liquefaction condition, the liquefaction rate of corn cob reaches 91.5%.

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Abstract

The invention provides a method for catalyzing waste of crops to be liquefied by microwave heating, which comprises: the waste of crops is added into polylol and sulphuric acid for microwave heating, the temperature is controlled to be 150-180 DEG C, and the liquification reaction is carried out for 10-30min. The method utilizes microwave auxiliary heating and reaction catalytic effect to realizerapid liquification for the waste of crops, thus greatly improving the liquification efficiency of the waste of crops and the liquification effect thereof, and leading the liquification efficiency toreach over 90%; the operation of the method is rapid, simple and convenient as well as efficient, so that the liquification cost of the waste of crops can be greatly reduced.

Description

technical field [0001] The invention relates to a method for utilizing agricultural waste, in particular to a method for preparing biomass polyols which can quickly liquefy agricultural waste and greatly improve the liquefaction effect. Background technique [0002] With the society's increasing demand for energy, the main energy fossil fuels are rapidly decreasing. Therefore, countries around the world have begun to pay extensive attention to the development and utilization of agricultural and forestry biomass resources to replace traditional energy sources. [0003] my country is a large agricultural country with abundant crop straw resources and large reserves. In 2005, my country's straw output exceeded 668 million tons. With the development of rural economy, the change of energy structure and the reduction of rural resident population and labor force, the straw used as energy for rural life has been significantly reduced, and more and more straw has been burned directl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/18C07C29/00B01J19/08B09B3/00
Inventor 韩鲁佳肖卫华赵艳艳
Owner CHINA AGRI UNIV
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