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A method for preparing activated carbon and furfural from corn cobs

A technology for preparing activated carbon and corn cobs, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as economic waste and environmental pollution, and achieve the effects of increasing yield, reducing production costs, and reducing production steps

Active Publication Date: 2017-09-29
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Corn cobs are the main raw materials for furfural production in my country. Every 1 ton of furfural produced produces more than 12 tons of furfural waste residue, and about 30 million tons of furfural waste residue is discharged every year. If it is not handled properly, it will not only pollute the environment, but also cause huge economic losses. waste

Method used

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  • A method for preparing activated carbon and furfural from corn cobs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The raw corncobs are purchased from the market and air-dried naturally, with a water content of 7%.

[0040] Corn cobs are crushed to a particle size of 15 mm to 20 mm, mixed with sulfuric acid solution, the mass concentration of the sulfuric acid solution is 15%, and the dosage of the sulfuric acid solution is 0.29 kg / (kg corn cobs).

[0041] The mixture of corncob and sulfuric acid is put into a hydrolysis reactor for stripping and hydrolysis, and water vapor passes through the bed of corncob sulfuric acid mixture from bottom to top; the steam temperature is 175°C, and the hydrolysis time is 2h (the contact time between water vapor and corncob reaches 2 hours , continuous exhaust). Furfural gas is collected during stripping, hydrolysis and pressure slagging, condensed and distilled to obtain furfural products.

[0042] The hydrolysis residue obtained from the stripped corn cob sulfuric acid mixture is furfural residue, and the hydrolysis residue is discharged from th...

Embodiment 2

[0046] The raw corncobs are purchased from the market and air-dried naturally, with a water content of 6%.

[0047] Corn cobs are crushed to a particle size between 15 mm and 20 mm, mixed with acid, the mass concentration of sulfuric acid is 10%, and the amount of sulfuric acid is 0.20 kg / (kg corn cobs). Stripping hydrolysis, steam temperature 172 ℃, hydrolysis time 1.5h. Furfural gas is collected during stripping, hydrolysis and pressure slagging, condensed and distilled to obtain furfural products. Furfural slag impregnation, 30% mass concentration of KOH solution and furfural slag 1:1 mixed, impregnated at room temperature for 5h, impregnated furfural slag and dried without free water. Impregnated with furfural slag and activated directly, activated at 500°C for 0.5h, activated at 800°C for 1h to obtain a solid. The solid is washed and dried to obtain an activated carbon product. Operations not particularly described are the same as in Example 1.

[0048] The yield of f...

Embodiment 3

[0050] Corn cobs are crushed to a particle size of 15 mm to 20 mm, mixed with acid, the mass concentration of sulfuric acid is 13%, and the amount of sulfuric acid is 0.25 kg / (kg corn cobs). Stripping hydrolysis, steam temperature 174 ℃, hydrolysis time 2h. Furfural gas is collected during stripping, hydrolysis and pressure slagging, condensed and distilled to obtain furfural products. Furfural slag impregnation, 40% mass concentration of KOH solution and furfural slag 1:1 mixed, impregnated at room temperature for 5h, impregnated furfural slag and dried without free water. Impregnated with furfural slag and activated directly, activated at 500°C for 0.5h, activated at 800°C for 1h to obtain a solid. The solid is washed and dried to obtain an activated carbon product. Operations not particularly described are the same as in Example 1.

[0051] The yield of furfural is 15.2%, the yield of activated carbon is 24.9%, and the specific surface area is 1950.2m 2 / g.

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Abstract

The invention provides a method for preparing activated carbon and furfural by taking corncob as a raw material. The method for preparing the activated carbon and furfural by taking the corncob as the raw material comprises the following steps: 1) smashing the corncob until particle size is 15-20mm; 2) mixing the corncob with sulphuric acid solution; 3) carrying out steam stripping and hydrolysis, namely enabling steam to be contacted with the corncob for carrying out hydrolysis; 4) collecting gas during steam stripping, hydrolysis and pressure deslagging, condensing, and distilling, so as to obtain a furfural product; 5) impregnating furfural residue, namely mixing KOH solution with the furfural residue, and impregnating at room temperature; 6) drying to a free-water-less state; and 7) directly activating, namely activating the dried furfural in two stages. The method provided by the invention has the advantages that the corncob is taken as the raw material for cooperatively producing furfural and activated carbon products, so that economic benefit of furfural production can be greatly improved; high hydrolysis temperature and short hydrolysis time are adopted, so that furfural condensation is avoided during production, and yield of furfural is increased; and the furfural residue is adopted for preparing the activated carbon, so that waste residue in a furfural production process can be effectively utilized, and environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the field of activated carbon preparation, and in particular relates to a method for preparing activated carbon using corncobs as raw materials. Background technique [0002] Activated carbon is a hydrophobic porous carbonaceous material prepared by high-temperature carbonization and activation from carbon-containing substances. It has a special microcrystalline structure, developed pore structure, large specific surface area and strong adsorption capacity, and can effectively remove chroma and odor. Odor, most organic pollutants and some inorganic substances have been widely used in chemical industry, food processing, medicine, national defense, agriculture and other fields, especially play an important role in environmental protection, and have good development prospects. [0003] Furfural slag is a solid waste produced by high-temperature hydrolysis of corncobs, peanut shells, bagasse, cottonseed hulls and other biomass mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348C07D307/50
Inventor 蒋建新郑天然吉骊刘志平孙达峰赵鹏翔朱莉伟
Owner BEIJING FORESTRY UNIVERSITY
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