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Method for increasing hemicellulose extraction yield

A hemicellulose and pre-extraction technology, which is applied in the field of improving the comprehensive utilization efficiency of biomass materials, can solve the problems of high requirements, high operating costs, and increased production costs, and achieve the goal of increasing hemicellulose content, improving the process, and being easy to operate Effect

Active Publication Date: 2019-06-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the physical method pretreatment will destroy the fiber structure, the operating cost is high; the requirements for the production equipment of dilute acid pretreatment are relatively high, and the requirements for process control conditions are very strict, which will also cause certain pollution to the environment. More importantly, dilute acid pretreatment The treatment will hydrolyze part of the cellulose, which is unfavorable to the pulping process; the alkali pretreatment process adds alkali during the pre-extraction process, which will dissolve part of the lignin, making the purification of hemicellulose more difficult , while increasing the production cost
The hot water pre-extraction method does not need to use acid, and the pretreated slurry does not need to use chemicals for buffering and neutralization treatment, which reduces the cost and achieves the purpose of no pollution to the environment. However, the existing hot water pre-extraction The yield of hemicellulose still needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take 30g of air-dried poplar wood chips (absolutely dry), fully soak the wood chips with 178mL deionized water until the wood chips are completely soaked, freeze the soaked wood chips in a -20°C refrigerator for 6 hours, then take out the wood chips, and thaw at room temperature for 5 hours , until the wood chips are completely thawed, freeze-thaw cycle once;

[0025] (2) After the freeze-thaw treatment is completed, use a rotary multi-pot cooker to add the freeze-thaw treated wood chips and soaking solution (that is, the water after soaking the wood chips in step (1)) and heat up to 170°C to cook the wood chips. The heating time is 1 hour, and the temperature is kept. After 1 hour of reaction, the cooking liquid was collected, and the extraction amount of wood chip hemicellulose was detected by ion chromatography to be 88.43 mg / g.

[0026] Control group 1: Take 30g of air-dried poplar wood chips (absolutely dry), use a rotary multi-pot cooker, add 178mL deionized w...

Embodiment 2

[0028] (1) Take 30g of air-dried poplar wood chips (absolutely dry), fully soak the wood chips with 178mL deionized water until the wood chips are completely soaked, freeze the soaked wood chips in a -20°C refrigerator for 6 hours, then take out the wood chips, and thaw at room temperature for 5 hours , until the wood chips are completely thawed, freeze-thaw cycle 4 times;

[0029] (2) After the freeze-thaw treatment is completed, use a rotary multi-pot cooker to add the freeze-thaw treated wood chips and soaking solution (that is, the water after soaking the wood chips in step (1)) and heat up to 170°C to cook the wood chips. The heating time is 1 hour, and the temperature is kept. After 1 hour of reaction, the cooking liquor was collected, and the extraction amount of wood chip hemicellulose was detected by ion chromatography to be 100.72 mg / g.

[0030] Control group 2: Take 30g of air-dried poplar wood chips (absolutely dry), use a rotary multi-pot cooker, add 178mL deioniz...

Embodiment 3

[0032] (1) Take 30g of air-dried poplar wood chips (absolutely dry), fully soak the wood chips with 178mL deionized water until the wood chips are completely soaked, freeze the soaked wood chips in a -20°C refrigerator for 6 hours, then take out the wood chips, and thaw at room temperature for 5 hours , until the wood chips are completely thawed, freeze-thaw cycle once;

[0033] (2) After the freeze-thaw treatment is completed, use a rotary multi-tank cooker to add the freeze-thaw treated wood chips and soaking solution (that is, the water after soaking the wood chips in step (1)) and heat up to 160°C to cook the wood chips for 1 hour. After 1 hour of reaction, the cooking liquid was collected, and the extraction amount of wood chip hemicellulose was detected by ion chromatography to be 60.79 mg / g.

[0034] Control group 3: Take 30g of air-dried poplar wood chips (absolutely dry), use a rotary multi-pot cooker, add 178mL deionized water to cook the wood chips at 160°C, heat up...

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PUM

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Abstract

The invention belongs to the field of improving the comprehensive utilization efficiency of biomass materials, and particularly relates to a method for increasing the hemicellulose extraction yield. The method comprises the steps of: washing a biomass material, conducting air drying, then thoroughly immersing the biomass material with water, and performing freeze-thaw treatment on the immersed biomass material; and adding a soaking liquid (which is water after the biomass material is soaked) to the frozen-thawed biomass material, conducting boiling, and collecting the boiling liquid after thereaction is completed, so as to obtain a pre-extracted sugar liquid. A reagent used in the invention is deionized water, no chemical reagent is added in the whole process, and the environment is protected. The extraction process is simple and easy to operate. It is expected to reduce the dissolution rate of hemicellulose while the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of improving the comprehensive utilization efficiency of biomass materials, and in particular relates to a method for improving the extraction yield of hemicellulose. Background technique [0002] Plant fiber raw materials are the most abundant renewable resources in nature, and the paper industry is a large user of plant resources. About 100 million tons of plant fiber raw materials are used for pulp and paper making in the world every year. However, pulping and papermaking only utilize cellulose, one of the three major components of plant raw materials, while hemicellulose and lignin, which are also the three major components, are relatively less utilized. How to effectively use plant fiber resources has become a problem in many countries in the world. one of the important areas of research. Efficient and environmentally friendly extraction of hemicellulose from plant fiber resources is of great significance for pl...

Claims

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Application Information

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IPC IPC(8): C08B37/14
Inventor 朱慧霞杨仁党
Owner SOUTH CHINA UNIV OF TECH