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A method for preparing fulvic acid by activating lignite with composite photocatalyst

A technology of fulvic acid salt and catalyst, which is applied in the field of coal chemical industry, can solve the problems of difficulty in large-scale industrial production, unfavorable popularization and use, and difficult recycling, etc., and achieve the goal of large-scale popularization and application, reduction of decomposition, and increase of yield Effect

Active Publication Date: 2020-05-08
QUJING NORMAL UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the separation process of the method of the invention is simple and convenient, it is difficult to effectively convert humic acid into fulvic acid in the method of the invention, and there are many preparation steps, complicated operation, high resin cost, and difficulty in recycling, and large-scale industrial production is difficult. Facilitate the promotion and use in agriculture

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  • A method for preparing fulvic acid by activating lignite with composite photocatalyst

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Effect test

Embodiment 1

[0040] A method for preparing fulvic acid sodium salt by activating lignite with composite photocatalyst, comprising steps:

[0041] Grind 100g of lignite into lignite powder with a particle size of 30 mesh, add it to 200g of water, then add solid sodium hydroxide to adjust the pH to 9, stir and react for 3 hours at a temperature of 45°C, and centrifuge to obtain a humate solution; Then add the dilute sulfuric acid that mass fraction is 5% to above-mentioned solution, adjust pH to be 1, stir at room temperature for 15min, leave standstill at room temperature for 20min, obtain upper layer solution and lower layer precipitation after centrifugation, add sodium hydroxide to the upper layer solution and adjust pH to be 7, After the solution was evaporated to dryness, the solid A1 of small molecular fulvic acid sodium salt was obtained.

[0042] The above precipitate was added to 150g of water, and sodium hydroxide was added to adjust the pH of the solution to 9, then 10g of hydrogen...

Embodiment 2

[0045] A method for preparing fulvic acid sodium salt by activating lignite with composite photocatalyst, comprising steps:

[0046] Grind 100g of lignite into lignite powder with a particle size of 45 mesh, add it to 300g of water, then add solid sodium hydroxide to adjust the pH to 10, stir and react for 2 hours at a temperature of 65°C, and centrifuge to obtain a humate solution; Then add the dilute sulfuric acid that mass fraction is 5% to above-mentioned solution, adjust pH to be 1, stir at room temperature for 15min, leave standstill at room temperature for 20min, obtain upper layer solution and lower layer precipitation after centrifugation, add sodium hydroxide to the upper layer solution and adjust pH to be 7, After the solution was evaporated to dryness, the solid B1 of small molecular fulvic acid sodium salt was obtained.

[0047] The above precipitate was added to 99.2g of water, and sodium hydroxide was added to adjust the pH of the solution to 9, then 35g of hydr...

Embodiment 3

[0050] A method for preparing fulvic acid by activating lignite with composite photocatalyst, comprising steps:

[0051] Grind 100g of lignite into lignite powder with a particle size of 60 mesh, add it to 400g of water, then add solid potassium hydroxide to adjust the pH to 11, stir and react for 2 hours at a temperature of 75°C, and centrifuge to obtain a humate solution; Then adding mass fraction to the above solution is 5% dilute sulfuric acid, adjust the pH to 2, stir at room temperature for 15 minutes, leave it at room temperature for 20 minutes, obtain the upper layer solution and lower layer precipitation after centrifugation, and add potassium hydroxide to the upper layer solution to adjust the pH to 7, the solution After evaporating to dryness, solid C1 containing small molecule fulvic acid potassium salt was obtained.

[0052] Above-mentioned precipitate is joined in 124.5g water, and add sodium hydroxide to regulate solution pH to 9, then add 50g mass fraction in s...

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Abstract

The invention provides a method for preparing fulvic acid by activating lignite with a composite photocatalyst, comprising the steps of: uniformly mixing lignite powder and water, then adding alkali to adjust the pH to 9-11, and stirring for 2-11 at 45-75°C 3h, through solid-liquid separation to obtain humate solution; add acid, adjust pH to 1-2, stir for 10-20min, let stand for 10-30min, obtain solution and precipitation through solid-liquid separation; add alkali to the solution to neutralize The pH value is 7, and the solid product of fulvic acid salt is obtained after being evaporated to dryness; add the precipitate obtained above into water, add alkali to adjust the pH to 8-10, then add an oxidant and a composite photocatalyst, and stir under the condition of ultraviolet light irradiation After 2‑5h, after solid-liquid separation, the solution was evaporated to dryness to obtain the solid product of fulvic acid salt. The invention has simple production process, low cost, high activation rate of humic acid and high yield of fulvic acid salt, and is suitable for popularization and use in agricultural production.

Description

technical field [0001] The invention relates to a method for preparing fulvic acid by activating lignite with a composite photocatalyst, and belongs to the technical field of coal chemical industry. Background technique [0002] Lignite refers to coal with a long flame and smoke when it burns, and it is a kind of coal with a low degree of coalification. The content of humic acid in lignite can be as high as 30%-80%. The humic acid can be used as fertilizer synergist, soil improver and pesticide slow-release synergist, etc. It is a green and environmentally friendly organic fertilizer. Humic acid includes three types of fulvic acid, brown humic acid and black humic acid, and the molecular weight increases in turn. The smaller the molecular weight of humic acid, the more obvious the effect of improving soil and promoting plant growth. However, the content of small molecule fulvic acid in lignite itself is not high, and it needs to be activated to increase the yield of small m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07G99/00B01J23/06B01J35/02
CPCB01J23/06B01J35/004B01J35/023C07G99/00
Inventor 邵光伟徐文华张水花李本鸿宋涛高建仁邢士玉张艳玲范玲超
Owner QUJING NORMAL UNIV
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