Pretreatment method of lignocellulose by using microwave-assisted alkaline sodium sulfite

A technology of lignocellulose and sodium sulfite, which is applied in the field of biomass resource utilization and comprehensive utilization of agricultural waste, can solve the problems of ineffective removal of lignin, destruction of active ingredients, excessive alkali consumption, etc., and achieve good enzymatic hydrolysis effect Effect

Active Publication Date: 2015-08-12
JIANGNAN UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, the acid-base treatment has a relatively large damage to the active ingredients of the raw materials, the material yield is low, and it puts a certain pressure on environmental protection; while steam explosion and AFEX may produce toxic substances, and the production safety cannot be fully guaranteed; alkaline sodium sulfite treatment Cannot effectively remove lignin, and the amount of alkali is still too large

Method used

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  • Pretreatment method of lignocellulose by using microwave-assisted alkaline sodium sulfite
  • Pretreatment method of lignocellulose by using microwave-assisted alkaline sodium sulfite

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1 sodium hydroxide chemical treatment lignocellulose

[0023] The method for chemically treating lignocellulose with sodium hydroxide comprises the following steps: adding 10 g of wheat straw raw materials passed through a 40-mesh sieve into 80 mL of sodium hydroxide solution, wherein the concentration of NaOH is 2%, and then treating at 120° C. for 30 minutes. After treatment, cool to room temperature, and separate the solid and liquid by centrifugation. First, wash once with sodium hydroxide solution, and then wash with deionized water until the pH of the filtrate reaches neutrality. The filter residue obtained from solid-liquid separation was placed in an oven at 60° C., and the drying time was 9 hours. The mass of the dry matter was weighed to calculate the material yield. The resulting solids were treated as substrates for cellulase adsorption assays and enzymatic degradation reactions.

Embodiment 2

[0024] Example 2 Traditional alkaline sodium sulfite treatment of lignocellulose

[0025] The traditional method for processing lignocellulose with alkaline sodium sulfite comprises the following steps: adding 10 g of wheat straw raw material through a 40-mesh sieve into 80 mL of alkaline sodium sulfite solution, wherein Na 2 SO 3 The concentration of NaOH is 2%, the concentration of NaOH is 0.05%, and then treated in a reactor at 100°C for 20min. After treatment, cool to room temperature, and separate the solid and liquid by centrifugation. First, wash once with alkaline sodium sulfite solution, and then wash with deionized water until the pH of the filtrate reaches neutrality. The filter residue obtained from solid-liquid separation was placed in an oven at 60° C., and the drying time was 9 hours. The mass of the dry matter was weighed to calculate the material yield. The resulting solids were treated as substrates for cellulase adsorption assays and enzymatic degradation ...

Embodiment 3

[0026] Example 3 Microwave-assisted alkaline sodium sulfite treatment of lignocellulose

[0027] Utilize the lignocellulose processing method of the present invention technology, comprise the steps: join in the 80mL alkaline sodium sulfite solution of the wheat straw raw material 10g that crosses 40 mesh sieves, wherein Na 2 SO 3 The concentration of NaOH is 2%, and the concentration of NaOH is 0.05%. Microwave-assisted treatment is carried out, and the microwave power is constant at 300W. In a single cycle, the microwave working time is 2 minutes, the intermittent time is 1 minute, and the working time is 10 cycles, with a total time of 30 minutes. After microwave treatment, the solid-liquid separation was carried out by centrifugation. First, it was washed once with alkaline sodium sulfite solution, and then washed with deionized water until the pH of the filtrate reached neutrality. The filter residue obtained from solid-liquid separation was placed in an oven at 60° C., ...

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Abstract

The invention discloses a pretreatment method of lignocellulose by using microwave-assisted alkaline sodium sulfite, belonging to the technical fields of biomass resource utilization and agricultural waste comprehensive utilization. The method comprises the following steps: by using lignocellulose as a raw material, pulverizing, screening, and pretreating by using microwave-assisted alkaline sodium sulfite to lower the alkali consumption and enhance the pretreatment effect of the alkaline sodium sulfite; and carrying out solid-liquid separation, flushing the solid residue with an alkaline sodium sulfite solution, and washing with water to obtain the lignocellulose pretreatment product with favorable enzymolysis effect. The method can better remove lignin and reduce the inhibition effect of lignin on cellulose degradation, thereby effectively enhancing the conversion efficiency from lignocellulose to monosaccharide. The method reduces the chemical reagent consumption, is beneficial to environmental protection, and lowers the production cost, thereby generating higher economic value.

Description

technical field [0001] The invention relates to a microwave-assisted alkaline sodium sulfite lignocellulose pretreatment method, which belongs to the technical field of biomass resource utilization and comprehensive utilization of agricultural waste. Background technique [0002] Bioethanol is considered to be one of the most promising bioenergy sources, and it is an environmentally friendly and renewable energy source. At present, the raw materials for the production of fuel ethanol are mainly sugary and starchy crops (such as corn, sugarcane and soybean), which is the first generation of fuel ethanol technology. The resulting increase in food prices and the occupation of arable land will turn the energy crisis into turned into a food crisis. Therefore, in recent years, the second-generation fuel ethanol technology using lignocellulose derived from agricultural and forestry wastes such as straws as raw materials has attracted the attention of scientists from various countr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02
Inventor 程力顾正彪田顺风洪雁李兆丰
Owner JIANGNAN UNIV
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