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Method for extracting fulvic acid from lignite

An extraction method, the technology of fulvic acid, applied in the direction of organic chemistry, etc., can solve the problems of low yield of fulvic acid, large pollution, etc., and achieve the effect of low cost, low environmental pollution, and improved extraction rate

Active Publication Date: 2015-05-20
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem: the purpose of the present invention is to provide a method for extracting fulvic acid from lignite, which solves the problems of low yield and high pollution of conventional lignite extraction of fulvic acid; the method is environmentally friendly, economical and efficient, and the fulvic acid yield, High extraction rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Get Inner Mongolia Zhungeer lignite, which contains 56% humic acid and 27% fulvic acid.

[0018] (1) Pulverize the lignite to 200 meshes, weathering in sunlight, the effective light time for weathering is 210 hours, and the temperature is 20-28°C.

[0019] (2) Weigh 10 g of weathered lignite, add 25 g of hydrogen peroxide with a mass concentration of 30%, and place it in a microwave oven for microwave oxygenation for 30 minutes. The power of the microwave oven is 750W, the frequency is 2450MHz, and the oxygen decomposition temperature is controlled at 60°C by circulating low-temperature water.

[0020] (3), add 50 g of distilled water to the mixture after oxygenolysis, centrifuge, then filter the supernatant, evaporate with a rotary evaporator and vacuum dry to obtain fulvic acid solids. The calculated yield was 16.7%, and the extraction rate was 61.9%.

Embodiment 2

[0021] Example 2: Take Inner Mongolia Zhungeer lignite, which contains 56% humic acid and 27% fulvic acid.

[0022] (1), pulverize the lignite to 100 meshes, weathering in the sun, the effective light time for weathering is 140 hours, and the temperature is 15-25°C.

[0023] (2), take weathered lignite 10g, add mass concentration wherein to it and be 30% hydrogen peroxide 15g, be placed in microwave oven microwave oxygen decomposition 20 minutes, microwave oven power is 750W, frequency is 2450MHz, controls oxygen decomposition by circulating low-temperature water The temperature is 50°C.

[0024] (3), add 50 g of distilled water to the mixture after oxygenolysis, centrifuge, then filter the supernatant, evaporate with a rotary evaporator and vacuum dry to obtain fulvic acid solids. The calculated yield was 15.2%, and the extraction rate was 56.3%.

Embodiment 3

[0025] Embodiment 3: Take Inner Mongolia Zhungeer lignite, which contains 56% humic acid and 27% fulvic acid.

[0026] (1), pulverize the lignite to 80 meshes, weathering in sunlight, the weathering effective light time is 175 hours, and the temperature is 15-25°C.

[0027] (2) Take 10 g of weathered lignite, add 18 g of hydrogen peroxide with a mass concentration of 30%, place it in a microwave oven for microwave oxygen decomposition for 10 minutes, the power of the microwave oven is 750W, and the frequency is 2450MHz. The oxygenolysis temperature was controlled at 40°C by circulating low-temperature water.

[0028] (3), add 50 g of distilled water to the mixture after oxygen hydrolysis, centrifuge, then filter the supernatant, evaporate with a rotary evaporator and vacuum dry to obtain fulvic acid solids. The calculated yield was 13.4%, and the extraction rate was 49.6%.

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Abstract

The invention discloses a method for extracting fulvic acid from the lignite and belongs to the method for extracting the fulvic acid. The method comprises the following steps: 1, weathering the lignite crushed to 80-200 mesh in the sunlight; wherein the weathering illumination temperature is 15-30 DEG C, the weathering effective illumination time is 140-210 hours, producing the lignite sample; 2, adding the hydrogen peroxide with the mass concentration of 30% in the lignite sample processed in step 1 according to the mass ratio of the lignite to the hydrogen peroxide of (1:1.5)-(1:2.5) to obtain the mixtures of the lignite sample and the hydrogen peroxide, performing microwave oxidation degradation on the mixtures at 40-60 DEG C for 10-30 minutes; 3, adding distilled water in the oxidation-degraded mixtures, wherein the mass ratio of the distilled water to the lignite sample is 5:1; performing centrifugal separation, filtering the supernatant, evaporating by a rotary evaporator, performing vacuum drying to obtain the fulvic acid solid. The method has the advantages of green and environmentally friendly, economical and effective, is high in productivity and extraction efficiency of the fulvic acid, simple in process, low in cost and little in environment pollution.

Description

technical field [0001] The invention relates to a method for extracting fulvic acid, in particular to a method for extracting fulvic acid in lignite. Background technique [0002] Fulvic acid is the part of humic acid with low aromaticity, small molecules, many functional groups and good water solubility. It is also the part with the highest chemical, physiological and physical and chemical activities in the humic acid group, and plays a decisive role in many uses of humic acid. , It also determines the grade and market price of humic acid products. [0003] Among the preparation methods of fulvic acid at home and abroad, the extraction method is a representative fulvic acid preparation technology. The extraction of fulvic acid from lignite includes: alkali-dissolved acid analysis method, strong acid extraction method, sulfuric acid acetone / ethanol method, ion exchange resin method, catalytic oxygen decomposition method and organic solvent extraction method and other method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H99/00C07G99/00
Inventor 巩冠群张英杰赵跃民谢广元郑红磊李亚军石侃
Owner CHINA UNIV OF MINING & TECH
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