Method for extracting fulvic acid from brown coal by catalytic oxidation
A technology for catalytic oxidation and fulvic acid, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low extraction yield of fulvic acid and environmental pollution and other problems, to achieve the effect of effective separation and recovery of catalysts, high catalytic activity, and excellent target catalytic selectivity.
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Embodiment 1
[0047] S1. Pulverize lignite to 50 mesh, and weigh 10 g of powder lignite coal sample.
[0048] S2. Select an iron oxide / ceria binary composite catalyst with a particle size of 10-50nm and add it into the powder lignite coal sample prepared in the above S1 step at a mass ratio of 1:50000. The mass ratio of iron oxide to ceria is 2:1.
[0049] S3, take by weighing 15% mass concentration hydrogen peroxide 5g, 20% mass concentration formic acid 20g, successively add in the above-mentioned lignite and catalyst mixture, make the coal slurry liquid mixture containing hydrogen peroxide, formic acid, catalyst, and pass inert gas nitrogen to the mixture for protection.
[0050] S4. Put the coal slurry mixture in a water bath to heat and stir, and heat to 5°C for 5 minutes.
[0051] S5. Separating the lignite and the catalyst residue, and evaporating and drying the liquid to obtain fulvic acid solid. The weight of fulvic acid was 2.923g, and the yield was 29.2%.
Embodiment 2
[0053] S1. Pulverize lignite to 50 mesh, and weigh 10 g of powder lignite coal sample.
[0054] S2. Select an iron oxide / ceria binary composite catalyst with a particle size of 10-50nm and add it into the powder lignite coal sample prepared in the above S1 step at a mass ratio of 1:200000. The mass ratio of iron oxide to ceria is 6:1.
[0055] S3, take by weighing 15% mass concentration hydrogen peroxide 8g, 30% mass concentration formic acid 10g, successively add in the above-mentioned lignite and catalyst mixture, make the coal slurry liquid mixture containing hydrogen peroxide, formic acid, catalyst, and pass inert gas nitrogen to the mixture for protection.
[0056] S4. Put the coal slurry mixture in a water bath to heat and stir, and heat the temperature to 80°C for 100 minutes.
[0057] S5. Separating the lignite and the catalyst residue, and evaporating and drying the liquid to obtain fulvic acid solid. The weight of fulvic acid was 3.014g, and the yield was 30.1%.
Embodiment 3
[0059] S1. Pulverize lignite to 50 mesh, and weigh 10 g of powder lignite coal sample.
[0060] S2. Select an iron oxide / ceria binary composite catalyst with a particle size of 10-50nm and add it into the powder lignite coal sample prepared in the above S1 step at a mass ratio of 1:100000. The mass ratio of iron oxide to ceria is 5:1.
[0061] S3, take by weighing 20% mass concentration hydrogen peroxide 15g, 40% mass concentration formic acid 20g, add in the above-mentioned lignite and catalyst mixture successively, make the coal slurry liquid mixture containing hydrogen peroxide, formic acid, catalyst, and pass inert gas nitrogen to the mixture for protection.
[0062] S4. Put the coal slurry mixture in a water bath to heat and stir, and heat the temperature to 100°C for 180 minutes.
[0063] S5. Separating the lignite and the catalyst residue, and evaporating and drying the liquid to obtain fulvic acid solid. The weight of fulvic acid was 3.178g, and the yield was 31.8%...
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