Method for increasing total-component utilization rate of agricultural straw raw materials

A technology with full components and high utilization rate, applied in the direction of fermentation, etc., can solve the problems of difficult cleaning of lignin and high reaction temperature, and achieve the effect of good washing effect, high reactivity and simple method

Inactive Publication Date: 2018-01-09
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods still have the disadvantages of relatively high reaction temperature

Method used

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  • Method for increasing total-component utilization rate of agricultural straw raw materials
  • Method for increasing total-component utilization rate of agricultural straw raw materials
  • Method for increasing total-component utilization rate of agricultural straw raw materials

Examples

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Example Embodiment

[0029] Example 1 Pretreatment and enzymatic hydrolysis of different NaOH mass fractions

[0030]Choose wheat straw as raw material, cut into 3-5 cm pieces manually or mechanically, wash and air-dry, pulverize with a pulverizer, and collect 40-80 mesh particles by standard sieve. Sodium hydroxide is used as the additive, ethanol is the organic solvent, a certain mass of NaOH is added to the ethanol solution with a volume fraction of 50%, and sodium hydroxide-ethanol pretreatment with a mass fraction of NaOH of 0.2%, 1%, and 1.8% is prepared. For the treatment agent, the solid-liquid ratio is 1:10 g / ml, the reaction temperature is 130° C., and the holding time is 3 h. After the reaction, vacuum filtration is performed to separate the solid and the liquid. The solid was washed with a large amount of ultrapure water until neutral, and then dried at 40°C. Calculate the yield and analyze the chemical composition of the material. Add acetic acid-sodium acetate buffer (pH=4.8) to th...

Example Embodiment

[0037] The pretreatment of embodiment 2 different temperatures

[0038] Choose wheat straw as raw material, cut into 3-5 cm pieces manually or mechanically, wash and air-dry, pulverize with a pulverizer, and collect 40-80 mesh particles by standard sieve. Select sodium hydroxide as additive, ethanol as organic solvent, configure sodium hydroxide-ethanol pretreatment agent with sodium hydroxide mass fraction of 1% and ethanol volume fraction of 50%, solid-liquid ratio of 1:10 g / ml, and the reaction temperatures are respectively The temperature was 90°C and 170°C, the holding time was 3h, and the solid-liquid separation was carried out by vacuum filtration after the reaction. The solid was washed with a large amount of ultrapure water until neutral, and then dried at 40°C. Calculate the yield and analyze the chemical composition of the material. Add acetic acid-sodium acetate buffer (pH=4.8) to the solid material to keep the solid-liquid ratio at 1:40g / ml, add 30FPU / g cellulas...

Example Embodiment

[0042] Example 3 Pretreatment of Different Kinds of Alkaline Additives

[0043] Choose wheat straw as raw material, cut into 3-5 cm pieces manually or mechanically, wash and air-dry, pulverize with a pulverizer, and collect 40-80 mesh particles by standard sieve. Select sodium hydroxide, potassium hydroxide and ammonia water as alkaline additives, ethanol as organic solvent, add alkali into ethanol solution with a volume fraction of 50%, and configure sodium hydroxide and potassium hydroxide with an alkali mass fraction of 1% respectively. Alkaline ethanol pretreatment agent with ammonia water, the solid-liquid ratio is 1:10g / ml, the reaction temperature is 130°C, the holding time is 3h, and the solid-liquid separation is carried out by vacuum filtration after the reaction. The solid was washed with a large amount of ultrapure water until neutral, and then dried at 40°C. Calculate the yield and analyze the chemical composition of the material. Add acetic acid-sodium acetate ...

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Abstract

The invention discloses a method for increasing the total-component utilization rate of agricultural straw raw materials. The method comprises steps as follows: firstly, a low-boiling-point organic solvent system with alkali as an additive is taken as a pretreatment agent for treating the agricultural straw raw materials; after the pretreatment, the materials are subjected to solid-liquid separation, and the solid part is a material rich in carbohydrates and can be converted to fermentable sugar through enzymolysis with a cellulase solution (prepared from cellulase and beta-glucosidase); afterthe liquid part is evaporated and concentrated, lignin in the liquid part can be precipitated and recovered with an acid precipitation method. By means of combined application of alkali and an organic solvent, not only is lignin effectively separated from the raw materials under milder conditions, but also certain inhibition effect on degradation of the carbohydrates is achieved, and the utilization rate of the raw materials is effectively increased.

Description

technical field [0001] The invention relates to a method for improving the utilization rate of all components of agricultural straw raw materials, and belongs to the technical field of transformation and utilization of renewable energy and agricultural and forestry biomass resources. Background technique [0002] my country is a large agricultural country, and about 700 million tons of agricultural waste is formed every year. Except for a few straws that are used as livestock feed, farm manure and rural fuel, most straws are piled up or directly burned, which not only causes a huge waste of biomass resources , but also bring serious environmental pollution problems. Using agricultural waste such as wheat straw and corn stalks as raw materials, pretreatment to obtain lignin products, and then obtaining fermentable sugar liquid through enzymatic hydrolysis is an important way to rationally utilize waste biomass resources. The energy crisis and the realization of sustainable de...

Claims

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Application Information

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IPC IPC(8): C12P19/02C08H7/00
Inventor 沈葵忠周静房桂干盘爱享张华兰林艳施英乔邓拥军韩善明焦健丁来保田庆文梁龙李红斌
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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