Lignin degradation product removing method

A degradation product, lignin technology, applied in biofuel, fermentation, etc., can solve the problem of removal of lignin degradation products that have not been found yet

Active Publication Date: 2016-02-03
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few reports on advanced oxidation technology for the removal of lignin degradation products in lignocellulosic raw materials
The advanced oxidation technology based on sulfate radical (SO4·?) is also a treatment technology for phenolic wastewater developed rapidly in recent years, and the treatment The effect is more significant than that of OH, and there is no report on the removal of lignin degradation products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The removal method of lignin degradation products: mix typical lignin degradation products and ammonium persulfate in a certain molar ratio and place them in an electric constant temperature water bath shaker, control the reaction temperature and pH, and react under the condition of oscillation frequency 150r / min. The initial concentration of lignin degradation products was 0.1g / L, and the oxidation reaction was carried out in an electrothermal constant temperature water bath. The pH value of the reaction solution was adjusted by sodium hydroxide and sulfuric acid. The reaction solution with adjusted pH value was preheated for 10 minutes at the set temperature, and then the prepared ammonium persulfate stock solution (15g / L) was quickly added to start the reaction and start timing, and samples were taken for analysis at regular intervals.

[0026] Oxidation effect evaluation: The concentration of lignin degradation products before and after oxidation was analyzed by rev...

Embodiment 2

[0032] Pipette 5mL of ammonium persulfate stock solution (15g / L) and syringaldehyde concentrated solution (1g / L) into a 125mL Erlenmeyer flask, adjust the pH value to about 6.0 with sodium hydroxide and sulfuric acid, and add distilled water to the total volume 50mL, reacted at 80°C, shaking frequency 150r / min for 3h. During the reaction, samples were taken at regular intervals and analyzed by reversed-phase high-performance liquid chromatography (R-HPLC). Oxidation effect evaluation is with embodiment 1, and result is as follows Figure 4 shown. from Figure 4 It can be seen from the figure that under the optimal reaction conditions, the removal rate of syringaldehyde gradually increases with time, and reaches 100% when the reaction reaches 2 hours.

Embodiment 3

[0034] Pipette 5mL of ammonium persulfate stock solution (15g / L) and 4-hydroxybenzaldehyde concentrated solution (1g / L) into a 125mL Erlenmeyer flask, adjust the pH value to about 6.0 with sodium hydroxide and sulfuric acid, and add distilled water to The total volume is 50 mL, and the reaction is carried out at 80° C. with an oscillation frequency of 150 r / min for 3 h. During the reaction, samples were taken at regular intervals and analyzed by reversed-phase high-performance liquid chromatography (R-HPLC). Oxidation effect evaluation is with embodiment 1, and result is as follows Figure 5 shown. from Figure 5 It can be seen that under the optimal reaction conditions, the removal rate of 4-hydroxybenzaldehyde increases gradually with time, and reaches 100% when the reaction is carried out for 1 hour.

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Abstract

The present invention discloses a lignin degradation product removing method. According to the method, the lignin degradation products are adopted as the substrate, and the way that the persulfate is activated to generate the sulfate free radical is used to carry out oxidation removal on the lignin degradation products, wherein the activating way selects the thermal activating, and the persulfate selects ammonium persulfate as the oxidant. According to the present invention, the thermal activating way is used to activate the ammonium persulfate so as to perform the oxidation removal of the lignin degradation products, and the results show that the removal rates of vanillin, 4-hydroxybenzaldehyde, vanillic acid, 4-hydroxy benzoic acid and syringic acid achieve 100% within 1 h, and the syringic aldehyde removal rate achieves 100% within 2 h.

Description

technical field [0001] The invention belongs to the technical field of biorefining of lignocellulosic raw materials to produce fuel ethanol, chemical platform compounds and other bio-based products, and specifically relates to a method for removing lignin degradation products. Background technique [0002] At present, the production of promising biomass liquid fuels (such as fuel ethanol, biodiesel, hydrocarbon fuels, etc.) by using abundant renewable bio-resource lignocellulosic raw materials to cope with the world energy crisis has become a research hotspot in various countries. Currently dominating the biofuel market are biodiesel and fuel ethanol produced through transesterification and fermentation. However, in different production processes, the pretreatment of raw materials is involved, and some inhibitors will inevitably be produced during the pretreatment process, mainly including carbohydrate degradation products and lignin degradation products produced by the degr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C12P7/64
CPCY02E50/10
Inventor 朱均均荣亚运师林丽张晨徐颖邹丽花李欢吴加辉陈丽玮徐勇勇强欧阳嘉赖晨欢李鑫余世袁
Owner NANJING FORESTRY UNIV
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