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A kind of preparation method of coal-based fulvic acid

A technology of fulvic acid and sodium humate, applied in the field of fine chemical production, can solve the problems of harsh reaction conditions, environmental pollution, low yield, etc., and achieve the effects of reducing reaction energy consumption, reducing salt content and low cost

Active Publication Date: 2021-08-03
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of harsh reaction conditions, serious environmental pollution and low yield in the existing humic acid oxidative degradation production technology, and provides a preparation method of coal-based xanthohumic acid

Method used

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specific Embodiment approach 1

[0033] Specific embodiment one: the preparation method of coal-based fulvic acid of this embodiment comprises the following steps:

[0034] 1. Suspend coal powder in water, add H 2 o 2 、NaNO 3 and a solid acid catalyst, stirred and reacted at 50-100°C for 8 hours;

[0035] 2. Add NaOH aqueous solution to the reaction system to make the pH value of the system reach 8-12, and continue to stir for 2 hours to obtain a mixed solution;

[0036] 3. Centrifuge the mixed solution, and the obtained liquid is sodium humate solution;

[0037] 4. Add strong acid type cation exchange resin to the sodium humate solution to neutralize to pH 5, filter and remove the ion exchange resin and the precipitate generated to obtain the fulvic acid solution;

[0038] 5. Concentrate the fulvic acid solution under reduced pressure to a solid content of 10%, and spray dry to obtain powdery fulvic acid.

specific Embodiment approach 2

[0039] Embodiment 2: This embodiment differs from Embodiment 1 in that: the pulverized coal is lignite powder or weathered coal powder, and the total humic acid content in the pulverized coal is more than 35%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0040] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the particle size of the pulverized coal is 60-200 mesh. Others are the same as in the first or second embodiment.

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Abstract

A preparation method of coal-based fulvic acid relates to the technical field of fine chemical production, in particular to a preparation method of fulvic acid. The purpose is to solve the problems of harsh reaction conditions, serious environmental pollution and low yield in the existing humic acid oxidation degradation production technology. Method: 1. Suspend coal powder in water, add H 2 o 2 、NaNO 3 and solid acid catalyst, stirring and reacting; 2. Add NaOH aqueous solution to the reaction system and continue stirring to obtain a mixed solution; 3. Centrifuge the mixed solution, and the obtained liquid is sodium humate solution; 4. Add sodium humate solution Add strong acid type cation exchange resin for neutralization, and filter to obtain fulvic acid solution; 5. Concentrate the fulvic acid solution under reduced pressure, and spray dry to obtain powdery fulvic acid. The yield of fulvic acid prepared by this method is relatively high, which can reach more than 30%. The purity of fulvic acid is high, which can reach more than 90%. The invention is used for preparing fulvic acid.

Description

technical field [0001] The invention relates to the technical field of fine chemicals production, in particular to a preparation method of fulvic acid. Background technique [0002] Fulvic acid is a small molecular weight component of humic acid extracted from low-grade coal (peat, lignite and weathered coal), mainly aromatic hydroxycarboxylic acids with complex structures. Due to its small molecular weight, it can be dissolved in water or weakly acidic water, and has stronger biological activity than humic acid. [0003] Fulvic acid is a fine chemical with a wide range of uses. It can be used as a broad-spectrum plant growth regulator, which can promote plant growth, especially properly control the opening of crop leaf stomata, reduce transpiration, play an important role in drought resistance, improve stress resistance, increase production and improve quality, and can be used with some Non-alkaline pesticides are mixed and often have synergistic effects. [0004] In add...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 喻艳超冯俊凯郭芳武文菊由君刘波
Owner HARBIN UNIV OF SCI & TECH
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