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A kind of straw pretreatment method for extracting hemicellulose

A technology of straw pretreatment and hemicellulose is applied in the field of extraction of active components in straw, which can solve the problems of uneconomical application and high power consumption, and achieve the effects of low power consumption, increased contact area, and improved extraction rate.

Active Publication Date: 2019-01-11
GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively dissolve hemicellulose and lignin, but the bagasse is dried and crushed, which consumes more power and is not economical for industrial application, and cellulose cannot be used as a raw material for pulping and papermaking

Method used

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  • A kind of straw pretreatment method for extracting hemicellulose
  • A kind of straw pretreatment method for extracting hemicellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 100kg of bagasse to the extraction tank. After the extraction tank is evacuated, 1000L of pretreatment liquid (concentration of 5g / L sodium hydroxide aqueous solution) is sucked in at the ratio of solid-liquid ratio of 1g:10mL, and soaked for 10h at room temperature. After that, 330L of free lye in bagasse is discharged, and the discharged solution is dark brown. The remaining material in the extraction tank is sent to a high-concentration disc-type paper refiner. The material is ground into filaments with a diameter of 0.1-0.5mm. Centrifuge the material obtained from the slurry to discharge the free lye in the ground fiber. Collect 550L of the liquid, add 300L of water to the bagasse, stir, mix and wash, and centrifuge again to discharge 295L of alkali-containing washing water. Combine the three liquids to obtain 1175L. No xylan was detected. ; The collected solids are the processed bagasse fibers, and the bagasse fibers obtained are soft and dense.

Embodiment 2

[0024] Weigh 50 kg of bagasse fibers treated as described in Example 1 and 50 kg of bagasse fibers treated as described in Comparative Example 1 to extract 50 kg of hemicellulose by the alkaline method.

[0025] The extraction conditions are: solid-liquid ratio 1g:5mL, the lye used for extraction is an aqueous NaOH solution with a concentration of 8% (w / v), the extraction time is 12h, and the temperature is room temperature.

[0026] Then compare the NaOH concentration and color of the obtained hemicellulose extract, and use 95% (v / v) ethanol alcohol precipitation equivalent to 3 times the volume of the extract, 75% ethanol to wash the hemicellulose, and finally the dry hemicellulose The color, purity and extraction rate of the plain powder were compared, and the results are shown in Table 1.

[0027] Table 1:

[0028]

[0029] It can be seen from Table 1 that when the bagasse treated by the method of the present invention is extracted and refined by the conventional alkaline method, ...

Embodiment 3

[0031] Cut corn stalks into small sections with a length of 1 to 3 cm, weigh 100 kg and put it into the extraction tank, add 1000 L of pretreatment solution (concentration of 5g / L sodium hydroxide aqueous solution) at the ratio of solid-to-liquid ratio of 1g: 10mL, and heat to Soak for 1h after 60℃. After that, 330L of free lye in the material is discharged, the solution is dark brown, and the remaining material in the extraction tank is sent to a high-concentration disc paper refiner, and the material is ground into filaments with a diameter of 0.1-0.5mm. The material obtained from the slurry was centrifuged to discharge the free lye in the ground fiber, and 560L of the liquid was collected. The bagasse was added with 300L of water, stirred, mixed and washed, and centrifuged again to discharge 298L of alkali-containing washing water. The three liquids were combined to obtain 1188L. No xylan was detected. ; Collect the solid, that is, the processed cornstalk fiber, the obtained...

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Abstract

The invention discloses a straw pretreatment method for extracting hemicellulose. The straw pretreatment method comprises the steps of soaking and wetting straws by virtue of pretreatment liquid, sending the obtained mixture into a pulping machine, pulping until the particle sizes of obtained materials are smaller than or equal to 1.0mm, carrying out solid-liquid separation on the obtained materials, collecting solids, washing the solids with water, and extracting the hemicelluloses by virtue of the solids, wherein the pretreatment liquid is an alkali solution with the concentration of 1g / L-20g / L. According to the straw pretreatment method, straw fiber is wetted and softened by virtue of alkali liquid with a relatively low concentration, and the pulping machine is utilized for pulping the wetted straws, so that the contact area between the fiber in the straws and the pretreatment liquid is greatly improved, impurities such as acetyl, pigments and the like in the straw fiber are beneficially removed, the content of impurities in the subsequent hemicellulose extraction liquid is decreased without losing hemicelluloses in the straws, the extraction rate of the hemicellulose is increased, and furthermore, the consumption of treatment power of the materials is low.

Description

Technical field [0001] The invention relates to the extraction of active ingredients in straw, and in particular to a straw pretreatment method for extracting hemicellulose. Background technique [0002] Straw is a by-product of the human food and sugar production process. It is the most concentrated and most convenient renewable resource in human society. The main components of straw are composed of cellulose, hemicellulose and lignin. Cellulose is glucose (6). Carbon sugar) is a polymer composed of β-1,4 glycosidic bonds. Hemicellulose is a renewable polysaccharide whose content is second only to cellulose. It is mainly composed of xylan (a polymer of five carbon sugars and xylose). Glycans as the main component. The difference in the structure of macromolecular xylan and cellulose makes it have unique physical and chemical properties and biological activity, and has important development value in the fields of food, medicine and chemical industry. [0003] The cellulose, hemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/14
CPCC08B37/14
Inventor 陈海珊蔡爱华张永昌覃香香周玉恒
Owner GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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