Method for removing poplar lignin by cyclic utilization of acetic acid-hydrogen peroxide pretreatment liquid

A technology of pretreatment liquid and hydrogen peroxide, which is applied in the field of forestry biomass degradation and conversion, can solve the problems of difficult recycling, high consumption, and high concentration of pretreatment liquid, and achieve the effect of reducing costs and consumption

Active Publication Date: 2020-08-25
NANJING FORESTRY UNIV
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Problems solved by technology

[0003] The above research reports found that although acetic acid-hydrogen peroxide treatment has high efficiency in removing poplar lignin and can effectively improve the glucose conversion rate of raw materials, it has problems such as high concentration of pretreatment solution, large consumption, and difficult recovery, which limits acetic acid-hydrogen peroxide treatment. Application of hydrogen peroxide pretreatment in forest biomass biodegradation transformation process
In addition, the acetic acid-hydrogen peroxide pretreatment solution contains acetic acid, hydrogen peroxide, peracetic acid, sulfuric acid, monosaccharides, lignin degradation products, etc. If the pretreatment solution is directly recovered, there are not only complex processes, high costs, and serious pollution. and other shortcomings, and the peracetic acid in it is extremely unstable, and there are great dangers and hidden dangers in the process of fractional distillation and recovery.

Method used

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  • Method for removing poplar lignin by cyclic utilization of acetic acid-hydrogen peroxide pretreatment liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh poplar wood with a dry weight of 10g (with a lignin content of 27.9%), add 100% volume concentration of acetic acid-hydrogen peroxide solution and 100mM sulfuric acid at a solid-to-liquid ratio of 1:10, and pretreat at 80°C for 2h. Cooling after pretreatment, discharge, use vacuum pump to filter, separate solid and liquid, and the solid residue can be used to prepare monosaccharide or as biomass material. The pretreated waste liquid is mixed with the new poplar raw material according to the material-to-liquid ratio of 1:10, pretreated at 80°C for 2 hours, cooled, unloaded, filtered by a vacuum pump, separated from solid and liquid, and the solid residue is washed with water until neutral for enzymatic hydrolysis . The pretreatment waste liquid is used for the poplar pretreatment next time again, and the pretreatment liquid is repeatedly used 4 times according to the aforementioned steps.

[0046] Weigh 1g of pretreated poplar in a Erlenmeyer flask, add 20FPU cell...

Embodiment 2

[0053] The pretreatment method and reaction conditions are basically the same as in Example 1, except that the acetic acid-hydrogen peroxide concentration is 80% (v / v) in the acetic acid hydrogen peroxide pretreatment, and the pretreatment solution is used repeatedly 4 times.

[0054] The content of poplaric acid-insoluble lignin pretreated by acetic acid-hydrogen peroxide decreased from 24.4% to 0.52% (removal rate was 98.8%), the yield of enzymatic hydrolysis of glucose was 84.7%, and the yield of xylose was 99.5%.

[0055] The content of poplaric acid-insoluble lignin pretreated by the first pretreatment waste liquid was reduced to 2.9% (removal rate was 92.6%), the yield of glucose by enzymatic hydrolysis was 91.4%, and the yield of xylose was 89.8%.

[0056] The content of poplaric acid-insoluble lignin pretreated by the second pretreatment waste liquid was 3.8% (removal rate was 89.7%), the yield of enzymatic hydrolysis of glucose was 90.5%, and the yield of xylose was 86...

Embodiment 3

[0060] The pretreatment method and reaction conditions are basically the same as in Example 1, except that the temperature in the acetic acid hydrogen peroxide pretreatment is 60° C., and the pretreatment solution is used repeatedly 4 times.

[0061] The content of poplaric acid-insoluble lignin pretreated by acetic acid-hydrogen peroxide decreased from 24.4% to 0.47% (removal rate was 98.9%), the yield of enzymatic hydrolysis of glucose was 100.0%, and the yield of xylose was 98.4%.

[0062] The content of poplaric acid-insoluble lignin pretreated by the first pretreatment waste liquid used was 1.7% (removal rate was 95.7%), the yield of enzymatically hydrolyzed glucose was 98.9%, and the yield of xylose was 80.3%.

[0063] The content of poplaric acid-insoluble lignin pretreated by the second pretreatment waste liquid was 6.3% (removal rate was 83.0%), the yield of glucose by enzymatic hydrolysis was 90.1%, and the yield of xylose was 80.6%.

[0064] The content of poplaric ...

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Abstract

The invention provides a method for removing poplar lignin by cyclic utilization of acetic acid-hydrogen peroxide pretreatment liquid, and belongs to the technical field of forestry biomass degradation and conversion. The method comprises the following steps: mixing an acetic acid-hydrogen peroxide solution with poplar and sulfuric acid to obtain a mixture; treating the mixture at 60-80 DEG C for2 hours, and carrying out solid-liquid separation to obtain a liquid, namely a pretreatment liquid; and mixing the pretreatment solution with the poplar, and repeating for 3-4 times to realize cyclicutilization of the pretreatment solution. According to the method, the poplar is treated with the acetic acid-hydrogen peroxide pretreatment liquid, consumption of acetic acid-hydrogen peroxide is reduced, and the pretreatment cost is reduced; acetic acid and hydrogen peroxide are added into the pretreatment liquid to prolong the use frequency of the pretreatment liquid, and the supplemented reagents are non-toxic and harmless; the problems of complex recovery process, high cost and serious pollution of the pretreatment liquid are solved; 57% of poplar lignin can still be removed after the pretreatment liquid is repeatedly used for three times, and the yield of enzyme hydrolysis glucose of the pretreated poplar can reach 90.0% or above.

Description

technical field [0001] The invention belongs to the technical field of forestry biomass degradation and transformation, and in particular relates to a method for removing poplar lignin by recycling acetic acid-hydrogen peroxide pretreatment liquid. Background technique [0002] Poplar is a fast-growing tree species with short growth cycle, abundant resources, high cellulose content, and low price. Therefore, the use of biotransformation technology to convert poplar into bioenergy and chemicals has great application prospects. Pretreatment is a key step in the preparation of fermentable monosaccharides from poplar. The pretreatment of poplar mainly includes acid, alkali, ionic liquid, steam explosion and other methods. One of the main purposes of pretreatment is to remove lignin from poplar and improve the accessibility of enzymes to cellulose in the substrate. Generally speaking, the lower the lignin content of poplar, the higher the yield of enzymatic hydrolysis. In the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 张军华文沛瑶徐勇贾丽丽彭湃王佳
Owner NANJING FORESTRY UNIV
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