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Liquid-phase catalytic oxidation cycle method for preparing humic acid from coal residue

A technology of liquid-phase catalysis and oxidation cycle, applied in the field of applied chemistry, can solve problems such as excessive oxidation reaction, achieve the effects of reducing emissions, improving humic acid yield and resource utilization, and protecting the environment

Inactive Publication Date: 2009-09-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a liquid-phase catalytic oxidation cycle method for producing humic acid from coal residue in order to solve the problem of further effectively converting organic matter in the residue into humic acid, improving the yield of humic acid and resource utilization
When the oxidant concentration is too high, excessive oxidation reaction will occur, resulting in the generation of a large amount of carbon dioxide gas

Method used

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  • Liquid-phase catalytic oxidation cycle method for preparing humic acid from coal residue
  • Liquid-phase catalytic oxidation cycle method for preparing humic acid from coal residue
  • Liquid-phase catalytic oxidation cycle method for preparing humic acid from coal residue

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Experimental program
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Effect test

Embodiment 1

[0014] (1) At room temperature, add 1 kilogram of weathered coal humic acid extraction residue (called primary residue) to the reaction vessel, then add 1.7 grams of ferric oxide catalyst and 33 grams of solid sodium hydroxide, then add 3.3 liters of 0.6 % hydrogen peroxide, stirred and reacted for 1 hour and then separated from solid and liquid to obtain humic acid solution and secondary residue respectively. (2) 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxide were added to the secondary residue, and the solid-liquid separation was carried out after stirring for 1 hour to obtain the humic acid solution and the tertiary residue respectively. (3) Add 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxide to the three residues, stir the reaction for 1 hour and separate the solid and liquid to obtain humic acid solution and four residues respectively. (4) Add 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxi...

Embodiment 2

[0016] (1) At room temperature, add 1 kilogram of weathered coal humic acid extraction residue (called primary residue) to the reaction vessel, then add 1.7 grams of copper oxide catalyst and 33 grams of solid sodium hydroxide, then add 3.3 liters of 0.6% Hydrogen peroxide, stirred and reacted for 1 hour, solid-liquid separation, and humic acid solution and secondary residue were obtained respectively. (2) 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxide were added to the secondary residue, and the solid-liquid separation was carried out after stirring for 1 hour to obtain the humic acid solution and the tertiary residue respectively. (3) Add 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxide to the three residues, stir the reaction for 1 hour and separate the solid and liquid to obtain humic acid solution and four residues respectively. (4) Add 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxide to th...

Embodiment 3

[0018] (1) At room temperature, add 1 kilogram of weathered coal humic acid extraction residue (called primary residue) to the reaction vessel, then add 6.7 grams of zinc oxide catalyst and 33 grams of solid sodium hydroxide, then add 3.3 liters of 0.6% Hydrogen peroxide, stirred and reacted for 1 hour, solid-liquid separation, and humic acid solution and secondary residue were obtained respectively. (2) 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxide were added to the secondary residue, and the solid-liquid separation was carried out after stirring for 1 hour to obtain the humic acid solution and the tertiary residue respectively. (3) Add 33 grams of solid sodium hydroxide and 3.3 liters of 0.6% hydrogen peroxide to the three residues, stir the reaction for 1 hour and separate the solid and liquid to obtain humic acid solution and four residues respectively. The above three consecutive liquid-phase catalytic oxidation residues make 68% of the organ...

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Abstract

The invention relates to a liquid-phase catalytic oxidation cycle method for preparing humic acid from coal residue after coal humic acid extraction. The method comprises the following steps: putting the residue after the coal humic acid extraction in a reaction container at a room temperature and adding a catalyst with 0.1 per thousand to 10 percent of the quality of the residue; then, adding an oxidizer water solution with the 1 to 20 times of the quality of the residue; stirring to form a suspension and adding sodium hydroxide or potassium hydroxide as required so as to control a pH value to be in a range of 7 to 14; and reacting for 10 mins to 72 hours and stopping stirring; naturally standing or centrifugally separating a humic acid solution and secondary residue which contains the solid catalyst added in the preceding step, separating the humic acid by solid-liquid separation operation and obtaining the secondary residue as well. The invention can similarly carry out circular catalytic oxidation reactions to continuously increase the yield of the humic acid.

Description

technical field [0001] The invention belongs to the field of applied chemistry of environmental protection and resource utilization. Low-rank coal such as weathered coal is generally not used for thermal power generation, but low-rank coal contains humic acid. Coal humic acid can be extracted by lye extraction method, and the remaining solid is called residue. The invention aims to further efficiently convert the residue into humic acid through a liquid-phase catalytic oxidation cycle method, so as to reduce residue discharge, increase humic acid yield, and ultimately protect the environment and improve resource utilization. technical background [0002] my country is rich in low-rank coal resources such as weathered coal. Depending on the place of origin, the amount of humic acid contained in low-rank coal is also different. Such as figure 1 As shown, coal humic acid can be extracted by conventional lye extraction method. At present, in humic acid manufacturing plants,...

Claims

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Application Information

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IPC IPC(8): C07G99/00B01J23/745B01J23/72B01J23/06B01J23/28B01J23/34B01J23/80B01J23/88B01J23/889
CPCY02P20/584
Inventor 高志明江歆梅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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