Microwave-assisted pretreatment method for maize straws

A corn stalk and microwave treatment technology, which is applied to biofuels, fermentation and other directions, can solve the problems of harsh conditions and environmental pollution by alkaline reagents, and achieve the effects of low equipment requirements, reduced crystallinity, and low energy consumption

Inactive Publication Date: 2015-04-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although sodium hydroxide or quicklime can be used under normal pressure, a large amount of water is required to wash after pretreatment to remove alkaline reagents, and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Weigh the crushed corn stalks with a dry matter content of 5g into a 250mL reactor with a sealed lid, add 200mL of ethylenediamine solution with a mass volume concentration of 1%, stir evenly, tighten the sealed lid, and preheat to 50℃ . Use a microwave generator to microwave and heat the reactor. The microwave power is 500W, the treatment is 3min, the reaction temperature is 120℃, the above reaction temperature is maintained, the reaction is 10min, the reactor is cooled, the solid-liquid mixture is taken out and filtered with gauze, and the solid is washed with 400mL water , Filtering and drying to obtain pretreated corn stover.

[0032] The pretreated corn stover was analyzed by saccharification, and the glucose yield was 50%.

Example Embodiment

[0033] Example 2

[0034] Weigh the crushed corn stalks with a dry matter content of 5g into a 250mL reactor with a sealed lid, add 25mL of ethylenediamine solution with a mass volume concentration of 40%, stir evenly, and tighten the sealed lid without preheating. Use a microwave generator to microwave and heat the reactor, the microwave power is 800W, the treatment is 10min, the reaction temperature is 200℃, the above reaction temperature is maintained, the reaction is 60min, the reactor is cooled, the solid-liquid mixture is taken out and filtered with gauze, and the solid is washed with 400mL water , Filtering and drying to obtain pretreated corn stover.

[0035] The saccharification analysis of the pretreated corn stover showed that the glucose yield was 90%.

Example Embodiment

[0036] Example 3

[0037] Weigh the crushed corn stalks with a dry matter content of 5 g into a 250 mL reactor with a sealed cover, add 50 mL of ethylenediamine solution with a mass volume concentration of 20%, stir evenly, and tighten the sealed cover without preheating. Use a microwave generator to microwave and heat the reactor, the microwave power is 750W, the treatment is 8min, the reaction temperature is 180℃, the above reaction temperature is maintained, the reaction is 30min, the reactor is cooled, the solid-liquid mixture is taken out and filtered with gauze, and the solid is washed with 400mL water , Filtering and drying to obtain pretreated corn stover.

[0038] The saccharification analysis of the pretreated corn stover showed that the glucose yield was 85%.

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PUM

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Abstract

The invention discloses a microwave-assisted pretreatment method for maize straws. The microwave-assisted pretreatment method comprises the steps of mixing the maize straws and an ethylenediamine solution; and sequentially carrying out microwave treatment and thermal treatment under a closed condition to obtain pretreated maize straws. According to the method, the maize straws are pretreated by using the ethylenediamine solution under the assistance of microwaves, so that lignin can be effectively degraded, the crystallinity of cellulose can be reduced, and the enzymolysis efficiency of the cellulose and hemicellulose in the maize straws can be increased. The microwave-assisted pretreatment method is simple in operation, free of high-pressure equipment, low in equipment requirement and energy consumption and suitable for industrial production.

Description

Technical field [0001] The invention belongs to the technical field of cellulosic ethanol, and specifically relates to a method for microwave-assisted pretreatment of corn stalks. Background technique [0002] Liquid fuels are easy to transport and use, and have become an important source of industrial and daily energy. Among them, petroleum is currently the most used liquid fuel in the world. However, petroleum resources are not renewable and CO 2 The emission of pollutants and other polluting gases will cause environmental degradation. The development of renewable clean energy has become the top priority of my country's energy development strategy. Ethanol, as an alternative clean liquid energy source, has received widespread attention and attention. The traditional method of producing ethanol uses grain as a raw material and uses yeast to directly ferment to produce ethanol. However, this method requires a large amount of food to be consumed and faces “competition with others...

Claims

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Application Information

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IPC IPC(8): C12P7/10C12P19/02
CPCC12P7/10Y02E50/10
Inventor 元英进李文超秦磊朱家庆李炳志
Owner TIANJIN UNIV
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