A method of increasing a humic acid extraction ratio from brown coal

A technology of lignite humic acid and humic acid, applied in the direction of organic chemistry, can solve problems such as large equipment loss, air pollution, ecological environment damage, etc., and achieve the effect of easy separation and recovery, and simple process

Inactive Publication Date: 2016-04-06
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when lignite is directly burned, the thermal efficiency is very low, the loss of equipment is also great, and it will cause serious air pollution and great damage to the ecological environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for improving the extraction rate of lignite humic acid, comprising the steps of:

[0025] The lignite is crushed and sieved, and the treated lignite particle size is not more than 0.2mm. The lignite and sodium hydroxide are mixed with an alkali-carbon ratio of 0.7:1, and water and lignite are added to the reactor with a liquid-solid ratio of 20ml / g. The reaction was carried out at a temperature of 190° C. under saturated vapor pressure for 6 hours. After the extraction reaction is finished, filter the reaction product to remove the residue, adjust the pH value of the filtrate with 1mol / L hydrochloric acid until the humic acid is completely precipitated, then filter it again, and then dry it to obtain humic acid Acid products. The extraction rate of humic acid was measured to be 89.84%.

Embodiment 2

[0027] A method for improving the extraction rate of lignite humic acid, comprising the steps of:

[0028] The lignite is crushed and screened, and the treated lignite particle size is not more than 0.2mm. The lignite and sodium hydroxide are mixed with an alkali-carbon ratio of 0.5:1, and water and lignite are added to the reactor with a liquid-solid ratio of 20ml / g. The reaction was carried out at a temperature of 190° C. under saturated vapor pressure for 8 hours. After the extraction reaction is finished, filter the reaction product to remove the residue, adjust the pH value of the filtrate with 1mol / L hydrochloric acid until the humic acid is completely precipitated, then filter it again, and then dry it to obtain humic acid Acid products. The extraction rate of humic acid was measured to be 90.00%.

Embodiment 3

[0030] A method for improving the extraction rate of lignite humic acid, comprising the steps of:

[0031] The lignite is crushed and screened, and the treated lignite particle size is not more than 0.2mm. The lignite and sodium hydroxide are mixed with an alkali-carbon ratio of 0.5:1, and water and lignite are added to the reactor with a liquid-solid ratio of 20ml / g. The reaction was carried out at a temperature of 160° C. for 8 hours. After the extraction reaction is finished, filter the reaction product to remove the residue, adjust the pH value of the filtrate with 1mol / L hydrochloric acid until the humic acid is completely precipitated, then filter it again, and then dry it to obtain humic acid Acid products. The extraction rate of humic acid was measured to be 77.36%.

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Abstract

A method of increasing a humic acid extraction ratio from brown coal is provided. The method adopts the brown coal as a raw material and increases the humic acid extraction ratio through an alkaline hydrothermal reaction under certain conditions. Based on common humic acid extraction with an alkali liquid, the method increases the humic acid extraction ratio to be 70% or above through changing the concentration of the alkali liquid, the reaction temperature, and other conditions, while the humic acid extraction ratio of common humic acid solution with the alkali liquid is about 20%. The method includes adding the brown coal the particle size of which is 0.2mm or below into a reactor, adding an alkali metal oxide with an alkali-carbon ratio being 0.3-0.7:1, adding water with a liquid-solid ratio being 20 mL / g, reacting at 160-210 DEG C for 4-8 h, subjecting reaction products to solid liquid separation, removing filter residue, subjecting the filtrate to acid washing until a humic acid precipitate is completely precipitated, filtering and drying to obtain a humic acid product. The method is simple in process. Liquid and solid products are convenient to separate and recover.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of lignite and extraction of humate, in particular to a method for improving the extraction rate of lignite humic acid. Background technique [0002] Lignite has the characteristics of high moisture, high volatile matter, high oxygen content, low calorific value, strong chemical reactivity, easy weathering in the air, strong water absorption performance, etc., making it difficult to store and transport long distances, so it is mostly used as pit mouth fuel for power generation. However, when lignite is directly burned, the thermal efficiency is very low, the loss of equipment is also great, and it will cause serious air pollution and great damage to the ecological environment. In recent years, the development and utilization of lignite has also received more and more attention from the state. Therefore, how to develop and utilize lignite resources cleanly and efficiently is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G99/00
Inventor 贾建波陈丽薇刘全润黄光许邢宝林张传祥
Owner HENAN POLYTECHNIC UNIV
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