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Method for extracting fulvic acid through low-temperature carbonization

A technology of fulvic acid and low temperature, which is applied in special forms of dry distillation, organic chemistry, coke oven, etc., can solve the problems of low extraction rate and large residue discharge, and achieve the effect of improving extraction rate and less corrosive equipment

Active Publication Date: 2017-05-24
张辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Fulvic acid can be extracted from low-priced coal such as weathered coal and lignite. The commonly used extraction method is "alkali dissolution and acid precipitation", but the extraction rate of this method is low and the amount of residue discharge is large

Method used

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  • Method for extracting fulvic acid through low-temperature carbonization
  • Method for extracting fulvic acid through low-temperature carbonization

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The method for extracting fulvic acid by low-temperature dry distillation comprises the following steps:

[0027] (1) Low-temperature dry distillation: break the weathered coal into particles no larger than 0.5mm, then place it in a closed container isolated from air, and conduct low-temperature dry distillation at 500°C-650°C for 30 minutes to 40 minutes to collect coal tar;

[0028] (2) Alkaline extraction: Coal tar is mixed with weak alkaline solution, the pH of the mixed solution is adjusted to 6.0-8.0 to obtain an alkaline extraction solution, and CuCl is added to the alkaline extraction solution 2 powder, CuCl 2 The mass ratio of powder to coal tar is 0.03:1; stir the alkali extraction solution for 0.5-1h, centrifuge and discard the precipitate to obtain the alkali extraction supernatant;

[0029] (3) acid extraction: use 0.5MHNO 3 The solution adjusts the pH of the alkali-extracted supernatant to 1.0-2.0 to obtain an acid extract, and adds MnO to the acid extra...

Embodiment 2-18

[0034] Except for the contents shown in Table 1 below, it was carried out in the same manner as in Example 1.

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Abstract

The invention discloses a method for extracting fulvic acid through low-temperature carbonization. The method comprises the following steps of 1, low temperature carbonization, decomposed coal is smashed into particles with the size not larger than 4 mm, and then placed into a closed container isolated from air, and low-temperature carbonization is performed on the condition of 500-650 DEG C for 30-40 min to collect coal tar; 2, alkaline extraction, wherein coal tar and a weak base solution are mixed, the pH of the mixed solution is adjusted to be 6.0-8.0 to obtain an alkaline extraction solution, the alkaline extraction solution is stirred for digestion for 0.5-1 h, and precipitates are removed after centrifuging is performed, and an alkaline extraction supernate is obtained; 3, acid extraction, wherein a 0.5 MHNO3 solution is used for adjusted the pH of the alkaline extraction solution to 1.0-2.0 to obtain an acid extraction solution, the acid extraction solution is stirred for digestion for 0.5-1 h, precipitates are removed after centrifuging is performed, and an acid extraction supernate is obtained; 4, freeze drying, wherein the acid extraction supernate is frozen and dried to obtain fulvic acid powder. Before alkali extraction and acid extraction, low-temperature carbonization is performed on decomposed coal, organic matter in the decomposed coal can be split to the maximum extent, and the fulvic acid extraction rate is increased; weak base is adopted for alkali extraction, and equipment corrosivity is small in the extraction process.

Description

technical field [0001] The invention relates to the technical field of fulvic acid extraction, in particular to a method for extracting fulvic acid by low-temperature dry distillation. Background technique [0002] The technical background related to the present invention will be described below, but these descriptions do not necessarily constitute the prior art of the present invention. [0003] Fulvic acid is an important component of humus, it can dissolve in acid, alkali and neutral solution, and it is an important component of water and soil organic matter. The structure of fulvic acid is very complex, and the elemental composition and chemical structure vary with time, space and source. Fulvic acid plays an important role in environmental geochemistry and global ecosystems. Predecessors have carried out extensive research on the geochemical characteristics of fulvic acid from various sources such as oceans, rivers, and wastewater, and have made a series of progress. ...

Claims

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Application Information

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IPC IPC(8): C10B53/04C07G99/00
CPCC10B53/04C07G99/00
Inventor 张辉
Owner 张辉
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