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Method for extracting celluloses, hemicelluloses and lignins from pennisetum hydridum

A technology of hemicellulose and juncao, applied in the field of biomass conversion and utilization, can solve the problems such as the lack of high-value utilization of wood fiber, achieve high purity, high yield and purity, and improve high-value utilization. Effect

Active Publication Date: 2016-05-11
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, giant fungus grass is mainly used as fungi culture material, cattle and sheep feed, biomass fuel power generation, or used in fiberboard manufacturing, etc., and its rich wood fiber has not been used for high value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Raw material pretreatment: crush the air-dried giant fungus grass, and sieve through a sample sieve to obtain grass powder of 40-60 mesh. The obtained grass powder was extracted with benzene-alcohol mixture (toluene:ethanol v / v=2:1,) for dewaxing for 6 hours, and the ratio of grass powder and benzene-alcohol mixture was 1g:15ml. The dewaxed grass powder was added to deionized water according to the solid-to-liquid ratio of 1:25, stirred and extracted at 85°C for 3 hours, vacuum filtered, and the obtained grass powder was dried at 60°C, sealed and stored for later use.

[0029] Weigh 5g of the pretreated Jujuncao raw material, add NaOH-H 2 o 2 Mixed solution (NaOH concentration 4%, H 2 o 2 Concentration is 0.5%) flat-bottomed three-necked flask, then add tetraacetylethylenediamine (addition amount is 0.2%). Using a microwave chemical reaction generator, heat to 75°C, heat-preserve and stir for 3 hours. After the reaction was terminated, vacuum filtration was perform...

Embodiment 2

[0035] The pretreatment of raw material is with embodiment 1.

[0036] Weigh 5g of the pretreated Jujuncao raw material, add NaOH-H 2 o 2 Mixed solution (NaOH concentration 4%, H 2 o 2Concentration is 0.5%) flat-bottomed three-necked flask, then add tetraacetylethylenediamine (addition amount is 0.2%). Using a microwave chemical reaction generator, heat to 75°C, heat-preserve and stir for 4 hours. After the reaction was terminated, vacuum filtration was performed, and the resulting residue was dried at 60° C. to obtain 1.95 g of cellulose. Use 6mol / L HCl to adjust the pH of the filtrate to 5.0-5.5, evaporate and concentrate about 3 times, add 3 times the volume of 95% ethanol, precipitate hemicellulose, use a high-speed centrifuge, centrifuge (7500r / min, 15min), The precipitate was washed with 70% ethanol, centrifuged 2-3 times, and dried at 60° C. to obtain 1.32 g of hemicellulose. The supernatant obtained by centrifugation is subjected to low-pressure rotary evaporatio...

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Abstract

The invention discloses a method for extracting celluloses, hemicelluloses and lignins from pennisetum hydridum. The method includes: (1) adding benzene-alcohol mixed liquid into the pennisetum hydridum to realize dewaxing, adding water into dewaxed pennisetum hydridum, extracting, filtering, and drying to obtain pretreated pennisetum hydridum; (2) sequentially adding NaOH-H2O2 mixed solution and tetraacetylethylenediamine into the pretreated pennisetum hydridum, treating for 1-4h at the temperature of 55-95 DEG C, filtering, and drying filter residues to obtain the celluloses; (3) adjusting a pH value of filtrate with the celluloses extracted to 5.0-5.5, adding ethyl alcohol to realize precipitation of hemicelluloses, and centrifugally separating to obtain the hemicelluloses; (4) recovering the ethyl alcohol in supernatant obtained after centrifugal separation at the step (3), adjusting a pH value of raffinate with ethyl alcohol recovered to 1.5-2.5, and centrifugally separating to obtain the lignins. By adoption of the method, the celluloses, the hemicelluloses and the lignins can be sequentially and effectively extracted in the same process, high extraction rate is realized, and high-value utilization of wood fibers in the pennisetum hydridum is improved.

Description

technical field [0001] The invention relates to a method for extracting cellulose, hemicellulose and lignin from giant fungus grass, belonging to the field of biomass conversion and utilization. Background technique [0002] Giant Juncao is also known as King Grass, Emperor Bamboo Grass, and Giant Elephant Grass. It is also known as power generation grass and energy grass. It has the characteristics of strong adaptability, fast growth and high yield. After testing, the cellulose content of giant fungus grass with a growth period of more than half a year can reach 25-43%, hemicellulose content can reach 20-32%, and lignin content can reach 10-13%, which is an excellent fiber biomass . [0003] At present, giant fungus grass is mainly used as fungi culture material, cattle and sheep feed, biomass fuel power generation, or used in fiberboard manufacturing, etc., and its rich wood fiber has not been used for high value. Therefore, it is necessary to develop an extraction metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00C08B37/14C08H7/00
CPCC08B37/003C08H6/00D21C5/00
Inventor 田中建陈嘉川杨桂花吉兴香孔令鹏杨阳
Owner QILU UNIV OF TECH
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