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Method for producing humic acid based on natural biomass

A humic acid and biomass technology, applied in the field of agricultural solid waste recycling, can solve the problems of unstable product and conversion rate, low conversion rate of natural biomass, low yield of humic acid, etc., to improve product characteristics and increase raw material Utilization rate, easy-to-operate effect

Pending Publication Date: 2022-06-24
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the natural biomass conversion rate of the above pyrolysis and microbial preparation methods is low, the universality is poor, and the yield of the prepared humic acid is not high, especially the microbial conversion method is greatly affected by biomass composition and environmental factors, and the product and conversion rate are not high. Stablize

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  • Method for producing humic acid based on natural biomass
  • Method for producing humic acid based on natural biomass
  • Method for producing humic acid based on natural biomass

Examples

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preparation example Construction

[0039] A preparation method of biomass-based humic acid, comprising the steps:

[0040] Pyrolysis of S1 biomass

[0041] Wash and dry the rice straw, cut it into pieces to a length of less than 0.1 cm, take a certain amount of it and place it in an atmosphere furnace, and under nitrogen protection, raise the temperature to 200 °C at a rate of 5 °C / min and maintain it for 1 h to obtain rice straw. bio-charcoal;

[0042] S2 hydrothermal base catalysis

[0043] Take 1 g of the biochar obtained in S1, add it to a hydrothermal reaction kettle, add 2 g of sodium hydroxide and 50 ml of deionized water to the reaction kettle, heat it with water at 200 ° C for 12 h, and filter out the residue after cooling to obtain a humic acid liquid;

[0044] S3 liquid to adjust acid, collect solid

[0045] Take 5 ml of the humic acid liquid prepared in S2, dropwise add 1M hydrochloric acid until pH is less than 2, centrifuge, and pour off the supernatant to obtain solid humic acid.

Embodiment 2

[0047] A preparation method of biomass-based humic acid, comprising the steps:

[0048] Pyrolysis of S1 biomass

[0049] Wash and dry the rice straw, cut it into pieces to a length of less than 0.1 cm, take a certain amount and place it in an atmosphere furnace. Under nitrogen protection, the temperature is raised to 250 °C at a rate of 5 °C / min and maintained for 1 h to obtain rice straw. bio-charcoal;

[0050] S2 hydrothermal base catalysis

[0051] Take 1 g of the biochar obtained in S1, add it to a hydrothermal reaction kettle, add 2 g of sodium hydroxide and 50 ml of deionized water to the reaction kettle, heat it with water at 200 ° C for 12 h, and filter out the residue after cooling to obtain a humic acid liquid;

[0052] S3 liquid to adjust acid, collect solid

[0053] Take 5 ml of the humic acid liquid prepared in S2, dropwise add 1M hydrochloric acid until pH is less than 2, centrifuge, and pour off the supernatant to obtain solid humic acid.

Embodiment 3

[0055] A preparation method of biomass-based humic acid, comprising the steps:

[0056] Pyrolysis of S1 biomass

[0057] Wash and dry the rice straw, cut it into pieces to a length of less than 0.1 cm, take a certain amount and place it in an atmosphere furnace, and under nitrogen protection, raise the temperature to 300 °C at a rate of 5 °C / min and maintain for 1 h to obtain rice straw. bio-charcoal;

[0058] S2 hydrothermal base catalysis

[0059] 1 g of biochar at different temperatures prepared by S1 was added to a hydrothermal reaction kettle, 2 g of sodium hydroxide and 50 ml of deionized water were added to the reaction kettle, hydrothermally heated at 200 ° C for 12 h, and the residue was filtered off after cooling to obtain humic acid liquid ;

[0060] S3 liquid to adjust acid, collect solid

[0061] Take 5 ml of the humic acid liquid prepared in S2, dropwise add 1M hydrochloric acid until pH is less than 2, centrifuge, and pour off the supernatant to obtain solid...

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Abstract

The invention discloses a preparation method of humic acid based on natural biomass, the structure and substance of the natural biomass are changed through pre-pyrolysis, the degradation rate and conversion rate of the natural biomass in subsequent hydrothermal alkaline hydrolysis are improved, the molecular weight and uniformity of a humic acid product are improved, and the natural biomass is quickly and efficiently catalytically converted with high quality. Particularly, kitchen garbage, agricultural and forestry wastes, marine algae wastes and the like which are difficult to treat in the prior art are treated, and a new method is provided for preparing high-added-value humic acid.

Description

technical field [0001] The invention belongs to the technical field of agricultural solid waste recycling, and in particular relates to a method for producing humic acid based on natural biomass. Background technique [0002] Humic acid is a macromolecular organic polymer that exists widely in nature. It is the builder of soil aggregates and the repository of fertilizers in the soil. It has important application and development potential in agriculture, forestry, environmental protection and other fields. Since the molecular structure contains abundant active functional groups such as carboxyl, hydroxyl, alcohol hydroxyl and carbonyl, humic acid molecules can exchange, adsorb, complex and chelate with metal ions, which can improve soil structure and is conducive to the growth of crops ; As a polyelectrolyte in the dispersion system, it has the functions of agglomeration, peptization and dispersion. Therefore, humic acid can improve soil physical and chemical properties, imp...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00Y02E50/10
Inventor 张鹏孙红文马明明
Owner NANKAI UNIV
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