Method used for extracting hemicellulose with low pigment content

A technology of hemicellulose and extraction method, which is applied in the field of biorefinery and extraction, can solve the problems of high viscosity of hemicellulose extract, low reusability, and difficulty in industrialization, and achieves improved color and luster, good economic and ecological benefits, High-volume effects

Inactive Publication Date: 2016-03-30
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

In order to overcome the above-mentioned problems, the invention of publication number CN201510620707 uses benzoxhlet extraction first, then passes through a macroporous resin column, and then decolorizes and removes wax in a microporous gel column. This method can only remove fat-soluble pigments, and still The hemicellulose extract will have a higher viscosity, and because benzene is carcinogenic, the Soxhlet extractor used for benzene alcohol extraction is limited to laboratory research and is difficult to industrialize
Because the hemicellulose extract is black, activated carbon is often used to decolorize the sugar solution, but because activated carbon absorbs the pigment, it will also cause the loss of the sugar solution, and its reusability is low, so its application is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Corn stalks were cut into 1 cm stalk pieces, which were placed in a high-speed mill for crushing, and straw powder with a particle size of less than 2 mm was collected. Mix 100g of straw powder and deionized water at a solid-to-liquid ratio of 1:8 (g / mL), soak at 80°C for 2 hours, and replace the deionized water every hour; then mix the above water-insoluble samples with 95% Ethanol was mixed at a solid-to-liquid ratio of 1:5 (g / mL), soaked at 60°C for 4h, and the obtained solid was dried in a vacuum oven at 45°C for 24h. Use 6% (w / v) sodium chlorite solution to mix with the above-mentioned straw at a solid-to-liquid ratio of 1:13 (g / mL), and add acetic acid with a mass fraction of 10% (w / v) to adjust its pH to 3.70, and treated at 75°C for 3 hours, solid-liquid separation was carried out after the reaction, the obtained residue was washed with distilled water until neutral, and then dried to obtain cellulose. The hemicellulose was extracted with 10% (w / v) NaOH solutio...

Embodiment 2

[0021] Corn stalks were cut into 3 cm straw pieces, which were placed in a high-speed mill for crushing, and straw powder with a particle size of less than 2 mm was collected. Mix 100g of straw powder and deionized water at a solid-to-liquid ratio of 1:5 (g / mL), soak for 3 hours at 70°C, and replace the deionized water every hour; then mix the above water-insoluble samples with 95% Ethanol was mixed at a solid-to-liquid ratio of 1:7 (g / mL), soaked at 60°C for 3h, and the obtained solid was dried in a vacuum oven at 45°C for 24h. Use 6% (w / v) sodium chlorite solution to mix with the above-mentioned straw at a solid-to-liquid ratio of 1:13 (g / mL), and add acetic acid with a mass fraction of 10% (w / v) to adjust its pH to 3.75, and treated at 70°C for 2.5 hours, solid-liquid separation was carried out after the reaction, and the obtained residue was washed with distilled water until neutral, and then dried to obtain cellulose. The hemicellulose was extracted with 8% (w / v) NaOH so...

Embodiment 3

[0023] Corn stalks were cut into 1 cm stalk pieces, which were placed in a high-speed mill for crushing, and straw powder with a particle size of less than 2 mm was collected. Mix 100g of straw powder and deionized water at a solid-to-liquid ratio of 1:8 (g / mL), soak at 80°C for 2 hours, and replace the deionized water every hour; then mix the above water-insoluble samples with 95% Ethanol was mixed at a solid-to-liquid ratio of 1:5 (g / mL), soaked at 60°C for 4h, and the obtained solid was dried in a vacuum oven at 45°C for 24h. Use 6% (w / v) sodium chlorite solution to mix with the above-mentioned straw at a solid-to-liquid ratio of 1:13 (g / mL), and add acetic acid with a mass fraction of 10% (w / v) to adjust its pH to 3.75, and treated at 75°C for 2 hours, solid-liquid separation was carried out after the reaction, and the obtained residue was washed with distilled water until neutral, and then dried to obtain cellulose. The hemicellulose was extracted with a 10% (w / v) NaOH s...

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Abstract

The invention discloses a method used for extracting hemicellulose with low pigment content. According to the method, corn straws are taken as raw materials; the method comprises the following steps: first, soaking the corn straws respectively with deionized water and ethyl alcohol to remove hydrophilic polysaccharide and fat soluble pigments, then removing lignin in the straws with sodium chlorite, extracting with aqueous alkali at the temperature of 80-120 DEG C, and finally, adding ethyl alcohol to deposit the hemicellulose. The extracted hemicellulose is in claybank, and the content of the impurity lignin is about 2%, and therefore, the quality of the hemicellulose of the corn straws can be obviously improved; meanwhile, the corn straws can be ungreased in a large volume, so as to provide the application basis for the industrialization of the hemicellulose.

Description

technical field [0001] The invention belongs to the field of biorefining and extraction, and in particular relates to a method for extracting hemicellulose with low pigment content. Background technique [0002] my country is a large agricultural country, and the annual output of corn stalks is as high as 250 million tons. As a large and cheap lignocellulosic resource, it was mainly used in the past for combustion to produce heat or directly incinerated. Due to the lack of effective use of it, huge resource waste and environmental pollution. Corn straw hemicellulose is abundant in nature and is the second largest polysaccharide after cellulose, accounting for about 20% to 40% of lignocellulosic raw materials. It is a potential basic raw material for biorefinery. [0003] As a new type of industrial material, hemicellulose can be used to produce ethanol, gel, resin, coating and surfactant, etc.; hemicellulose can be transformed into functional products such as xylooligosaccha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
CPCC08B37/14C08B37/0003
Inventor 徐建李宏强刘凯旋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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