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Method for extracting bagasse hemicellulose by microwave-puffing

A technology of hemicellulose and bagasse, which is applied in fiber raw material processing, pulping with inorganic alkali, textiles and papermaking, etc., and can solve problems such as long heat preservation time, high energy consumption, and inapplicability

Active Publication Date: 2021-04-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, J.A.Perez et al. used hot water to pretreat wheat straw to obtain 71.2% hemicellulose, but its holding time is longer and energy consumption is higher, so it cannot be widely used by people.
Esther Guerra-Rodriguez discussed the process conditions of extracting xylose from wheat straw straw with different concentrations of dilute sulfuric acid hydrolysis. The study found that 99% of the hemicellulose and 11% of the dextran in the raw material were hydrolyzed, so the dilute acid is easy to cause damage to the hemicellulose. Degradation, not suitable for pretreatment of bagasse to extract hemicellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for microwave-expansion extraction of bagasse hemicellulose, the specific steps are as follows:

[0019] (1) Bagasse puffing treatment: After dissolving the puffing agent ammonium bicarbonate in water, add the ammonium bicarbonate solution to the puffing agent according to the ratio of the puffing agent to 6% of the bagasse mass, stir and let it stand for 2 hours, then puff it in a microwave reactor , microwave power 600W, puffing temperature 60°C, puffing time 40s;

[0020] (2) Microwave-alkali extraction of hemicellulose: Step (1) The puffed bagasse is placed in the microwave reactor, and NaOH-NH 4 Cl solution, add water and stir evenly to obtain a mixture with a solid-to-liquid ratio kg:L of 1:7, the mass percent concentration of NaOH in the liquid of the mixture is 4%, and then the mixture is extracted at 105°C, microwave power 800W, and extraction time is 20min, wherein NaOH -NH 4 NaOH and NH in Cl solution 4 The mass ratio of Cl is 5:1;

[0021] (3) C...

Embodiment 2

[0024] A method for microwave-expansion extraction of bagasse hemicellulose, the specific steps are as follows:

[0025] (1) Bagasse puffing treatment: After dissolving the puffing agent sodium bicarbonate in water, add the sodium bicarbonate solution into the bagasse according to the proportion of puffing agent accounting for 16% of the bagasse mass, stir and let it stand for 3 hours, then puff it in a microwave reactor. Microwave power 800W, puffing temperature 110°C, puffing time 100s;

[0026] (2) Microwave-alkali extraction of hemicellulose: Step (1) The puffed bagasse is placed in the microwave reactor, and NaOH-NH 4 Cl solution, add water and stir evenly to obtain a mixture whose solid-liquid ratio kg:L is 1:5, the mass percent concentration of NaOH in the liquid of the mixture is 6%, and then the mixture is extracted at 95°C, microwave power 1000W, and extraction time is 80min, wherein NaOH -NH 4 NaOH and NH in Cl solution 4 The mass ratio of Cl is 5:1;

[0027] (3...

Embodiment 3

[0030] A method for microwave-expansion extraction of bagasse hemicellulose, the specific steps are as follows:

[0031] (1) Bagasse puffing treatment: After dissolving the puffing agent sodium dodecylbenzenesulfonate in water, add the puffing agent sodium dodecylbenzenesulfonate solution to the bagasse according to the ratio of the puffing agent to 12% of the bagasse mass, and stir it Set for 4 hours, puffed in a microwave reactor, microwave power 900 W, puffing temperature 90°C, puffing time 90s;

[0032] (2) Microwave-alkali extraction of hemicellulose: Step (1) The puffed bagasse is placed in the microwave reactor, and NaOH-NH 4 Cl solution, add water and stir evenly to obtain a mixture with a solid-to-liquid ratio kg:L of 1: 6, the mass percentage concentration of NaOH in the liquid of the mixture is 8%, and then the mixture is extracted at 85°C, microwave power 800W, and extraction time is 40min, wherein NaOH -NH 4 NaOH and NH in Cl solution 4 The mass ratio of Cl is ...

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Abstract

The invention discloses a microwave-expansion method for extracting bagasse hemicellulose. By using an expanding agent on the bagasse, the bagasse is subjected to microwave-expansion treatment to make the bagasse structure fluffy and facilitate the dissolution of hemicellulose; and under the condition of low alkali concentration Under the present invention, the use of microwave method to extract bagasse hemicellulose can effectively increase the yield of hemicellulose and ensure the molecular weight of hemicellulose; the invention can shorten the extraction reaction time of hemicellulose, reduce the alkali consumption, and the The quality of hemicellulose is better.

Description

technical field [0001] The invention relates to a microwave-expansion method for extracting bagasse hemicellulose, which belongs to the field of biomass refining and extraction. Background technique [0002] Bagasse is the main by-product of sugarcane sugar production, mainly composed of cellulose, hemicellulose and lignin, and its annual output exceeds hundreds of millions of tons. The use of bagasse in traditional industries is mainly focused on cellulose, but there are few reports on hemicellulose, which accounts for more than 20% of bagasse, mainly due to the inherent multi-component and multi-branched chemical structure of hemicellulose The resulting shortcomings of easy degradation and difficult extraction not only limit the application development of hemicellulose, but also slow down the implementation of comprehensive biomass refining. [0003] At present, the development and utilization of various components of bagasse has become a research hotspot of scholars at h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C5/00
CPCD21C3/02D21C5/00
Inventor 刘玉新李娇阳黄吉振孙兵
Owner KUNMING UNIV OF SCI & TECH
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