Preparation method for coal-based activated carbon for recovery of organic solvent

A coal-based activated carbon and organic solvent technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of less activated carbon and achieve good adsorption effect

Active Publication Date: 2013-12-25
NINGXIA BAOTA PETROCHEM SCI & TECH IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the activated carbon used for organic solvent recovery is mostly produced from wood materials, and the activated carbon produced from coal raw materials is less used for solvent recovery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Select Ningxia ultra-low ash anthracite clean coal with ash content ≤ 2% as raw material, crush it to 180 mesh, pour it into the kneading pot and stir, keep the temperature of the kneading pot at about 70°C, add coal tar, water, and sodium hydroxide aqueous solution in sequence, The amount of coal tar added is 35% of the weight of the pulverized coal, the amount of water added is 2% of the weight of the pulverized coal, the amount of 15% aqueous sodium hydroxide solution added as a catalyst is 2% of the weight of the pulverized coal, and stirred for 15 minutes. Then put it into the molding press and press it into a cylindrical carbon rod with a diameter of 3.8-5.2±0.2mm and a height of 5.7-7.8mm, and let it dry naturally. The thickness of the stack should not exceed 200mm to ensure that the carbon rod is completely dried and hardened. Then put it into the carbonization furnace, preheat to 150-200°C, and then carbonize at a uniform speed of 0.5m / min. The temperature of t...

Embodiment 2

[0022] Select Ningxia ultra-low ash anthracite cleaned coal with ash content ≤ 2% as raw material, crush it to 180-200 mesh, pour it into the kneading pot and stir, keep the temperature of the kneading pot at 80°C, add coal tar, water, and 14% hydroxide in sequence Sodium, wherein the addition of coal tar is 38% of the weight of pulverized coal, the addition of water is 3% of the weight of pulverized coal, and the addition of 14% sodium hydroxide as a catalyst is 3% of the weight of pulverized coal, stirring for 20 minutes. Then put it into the molding press and press it into a cylindrical carbon rod with a diameter of 3.8-5.2±0.2mm and a height of 5.7-7.8mm, and let it dry naturally. The thickness of the stack should not exceed 200mm to ensure that the carbon rod is completely dried and hardened. Then put it into the carbonization furnace, preheat to 200-300°C, and carbonize at a uniform speed of 0.5m / min. Keep it at 600-700°C, keep the temperature of the combustion chamber a...

Embodiment 3

[0024] Select Ningxia ultra-low ash anthracite cleaned coal with ash content ≤ 2% as raw material, crush it to 180-200 mesh, pour it into the kneading pot and stir, keep the temperature of the kneading pot at 70-90 °C, add coal tar, water, 13% sodium hydroxide, in which the amount of coal tar added is 40% of the weight of pulverized coal, the amount of water added is 3% of the weight of pulverized coal, the amount of catalyst 13% sodium hydroxide added is 3% of the weight of pulverized coal, and stirred for 15 minutes . Then put it into the molding press and press it into a cylindrical carbon rod with a diameter of 3.8-5.2±0.2mm and a height of 5.7-7.8mm, and let it dry naturally. The thickness of the stack should not exceed 200mm to ensure that the carbon rod is completely dried and hardened. Then put it into the carbonization furnace, preheat to 180-230°C, and carbonize at a uniform speed of 0.5m / min. Keep it at 580-650°C, keep the temperature of the combustion chamber at 6...

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PUM

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Abstract

The invention relates to a preparation method for coal-based activated carbon for recovery of an organic solvent. The preparation method is characterized in that kneading, forming, carbonization,pre-activation and activation are performed on pulverized coal, coal tar, water and catalyst to obtain columnar activated carbon, wherein the adding amounts of the coal tar, the water and the catalyst are respectively 35-40 percent, 2-4 percent and 2-3 percent of the weight of the pulverized coal, and the catalyst is the hydroxide aqueous solution with the mass concentration of 13-17 percent. According to the invention, the hydroxide catalyst is added into the kneading process to achieve the purposes of splitting functional groups, expanding activated carbon pores, improving the absorption performance and neutralizing inorganic acidic compounds in the pulverized coal; then activation is performed twice to completely remove tar substances and split products accumulated in the pore structure in the carbonization process, some closed pores are opened, and under the action of the catalyst, the functional groups are further decomposed, pores are formed, and pore volume and specific surface area of the activated carbon are improved. According to the activated carbon prepared with the method, the adsorption rate of carbon tetrachloride is not less than 80 percent, the adsorption rate of iodine is not less than 1,050 mg / g, the bulk density is 400-450 g / l, and the mechanical strength is not less than 91 percent.

Description

technical field [0001] The invention relates to a preparation method of activated carbon, in particular to a preparation method for recovering coal-based activated carbon from organic solvents. Background technique [0002] Organic solvents have special properties, can directly or indirectly disperse polymer compounds such as resins, pigments or dyes, and do not react with them, and can be volatilized after molding, so they are widely used in industry. With the development of various industries, more and more types of organic solvents are used. In order to prevent these solvents from evaporating and scattering during use, recycling and harmless treatment is essential in terms of saving resources, improving labor hygiene conditions, and protecting the global environment. [0003] The use of solid adsorbents to recover organic solvents is a common solvent recovery method. Commonly used solid adsorbents include molecular sieves, activated carbon and activated carbon fibers. ...

Claims

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Application Information

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IPC IPC(8): C01B31/10C01B32/336
Inventor 夏宁海于翔飞马晓茹张艳
Owner NINGXIA BAOTA PETROCHEM SCI & TECH IND DEV
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