Method for synchronously extracting hemicellulose, cellulose and lignin and reclaiming phenolic acid compounds

A technology of hemicellulose and lignocellulose, which is applied in the field of processing lignocellulosic biomass, can solve the problems of poor economic benefits and insufficient utilization of biomass raw materials

Inactive Publication Date: 2008-03-19
孔延华
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These modes of producing a single bulk product have a common feature because they...

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  • Method for synchronously extracting hemicellulose, cellulose and lignin and reclaiming phenolic acid compounds

Examples

Experimental program
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Effect test

Embodiment 1

[0071] 80 grams (absolute dry weight) of air-dried and pulverized cornstalk raw materials are packed into a stainless steel pressure reactor (capacity is 1 liter), and 800 milliliters of deionized water are added. Start stirring and heating, and use the preset heating speed to raise the reactor from room temperature to 180 degrees Celsius within 30 minutes, and keep it at 180 degrees Celsius for 30 minutes, then use the coil cooling device in the reactor to reduce the temperature of the reactor Rapidly drop to about 50 degrees Celsius, open the reactor, transfer the reactant to a funnel for liquid-solid separation, and wash the fiber solid several times with hot water. Recover all filtrate and fiber solids, record the total amount and sample for chemical analysis.

[0072] Get 50 grams (absolute dry weight) above the fiber solid that obtains and pack in identical reactor, add the ammonium hydroxide solution (15% concentration of NH of 500 milliliters) 3 weight), heated to 170...

Embodiment 2

[0075] Reaction apparatus and operation method are identical with example 1.

[0076] Raw material is wheat straw

[0077] The first paragraph processing: the same as example 1

[0078] The second stage of treatment: add 1% sulfuric acid (by weight of raw materials) with 50% ethanol aqueous solution, and the incubation time at 170 degrees Celsius is 30 minutes.

[0079] The hemicellulose dissolved in the first stage hydrolyzate was about 70% of the total amount in the raw material.

[0080] The recovered lignin in the second treatment liquid accounts for about 75% of the total amount in the raw material.

[0081] The conversion rate of enzymatic hydrolysis of the fiber residue obtained in the second stage into glucose is 96%

Embodiment 3

[0083] Reaction apparatus and operation method are identical with example 1.

[0084] The raw material is wheat straw.

[0085] The first stage of treatment: 0.5N sulfuric acid aqueous solution, 100 degrees Celsius, 60 minutes.

[0086] The second stage of treatment: 75% ethanol aqueous solution (1N sulfuric acid concentration), 120 degrees Celsius, 90 minutes.

[0087] The first stage treatment yielded 72% hemicellulose.

[0088] The second stage treatment yielded 69% lignin and 97% cellulose.

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Abstract

The present invention provides a technique method which separates lignose, hemicellulose, cellulose and phenolic acid from lignocellulosic biomass. Under the selected pH value and temperature, the lignocellulosic biomass is processed by hot water, so that the hemicellulose and the phenolic acid are preferentially resolved in aqueous solution, delignification processing is carried out, organic solvent or alkaline solution is applied to carry out high-temperature cooking, the generated liquid-solid phase product can be easily and effectively separated, and thus the hemicellulose, the cellulose and the phenolic acid can be respectively obtained. Moreover, enzymatic treatment can be selectively added, and a solid phase product is obtained at the first stage of a group of enzymatic treatment with a cooperative effect. Because the ferulic acid linkage between the hemicellulose and the lignose can be selectively broken, the separation of the chemical components has a high yield rate and high purity.

Description

technical field [0001] The invention relates to a method for simultaneously extracting various useful components from lignocellulosic biomass. More specifically, the present invention relates to a multi-stage method for treating lignocellulosic biomass, simultaneously extracting hemicellulose, lignin and cellulose, and recovering phenolic substances. Background technique [0002] Lignocellulosic biomass is the most abundant organic resource on earth, it is renewable, also commonly referred to as biomass. Biomass includes all agricultural residues (such as straw, husks and chaff of cereals, corn stover, bagasse), dedicated fiber crops (such as switchgrass, reeds, bamboo, flax, hemp and kenaf), wood and forest residues things. [0003] The three main components of lignocellulosic biomass are cellulose, hemicellulose and lignin. In the cell walls of plant fibers, complexes of cross-linked lignin and hemicellulose glue the cellulose fibers together to form a composite materia...

Claims

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Application Information

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IPC IPC(8): C07G1/00D21C5/00C08H7/00
Inventor 潘小琪孔延华
Owner 孔延华
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