A kind of preparation method of vocs high adsorption rate and low desorption residual granular activated carbon

A granular activated carbon and high-adsorption technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems of large desorption residue, high production cost, and small specific surface area, and achieve the effect of not being easy to overheat and burn

Active Publication Date: 2019-04-16
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0008] In order to solve the problems of high production cost, small specific surface area, low adsorption rate and large desorption residue in the prior art, the present invention provides a preparation method of VOCs high adsorption rate and low desorption residue granular activated carbon. The preparation method is simple and fast, and the product Low cost, concentrated micropore distribution, controllable pore size, large adsorption capacity for VOCs, and complete desorption

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  • A kind of preparation method of vocs high adsorption rate and low desorption residual granular activated carbon
  • A kind of preparation method of vocs high adsorption rate and low desorption residual granular activated carbon

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preparation example Construction

[0032] A method for preparing VOCs high adsorption rate and low desorption residual granular activated carbon, comprising the following steps:

[0033] The first step is to remove impurities and dry the husks: air-select the husks to remove impurities, wash and remove ash, and dry;

[0034] The second step, high-pressure impregnation: prepare the chemical agent into a solution of a certain concentration, mix it with the fruit shell, place it in a high-pressure stainless steel container, and immerse it under a certain pressure for 8 to 24 hours, take it out, and dry it. It is phosphoric acid or zinc chloride, the mass concentration is 10-60%, the mass ratio of fruit shell and chemical agent is 1: (1-6), the pressure is 0.5MPa-2MPa, and the drying temperature is 120°C;

[0035] Step 3: Activation: put the above-mentioned dried mixture in the activation reactor, heat up to the final activation temperature at a certain heating rate under a nitrogen atmosphere, and keep it warm for...

Embodiment 1

[0045] The first step is raw material preparation: the coconut shells are air-selected to remove impurities, washed to remove ash, and dried.

[0046] The second step, high-pressure impregnation treatment: prepare phosphoric acid into a solution with a mass concentration of 10%, mix it with the above-mentioned coconut shell according to the mass ratio of raw materials and phosphoric acid at 1:1, and place it in a high-pressure stainless steel container under a pressure of 0.5MPa Immerse for 24 hours, take it out, and dry it at 120°C.

[0047] The third step, activation: put the above-mentioned dried mixture in the activation reactor, raise the temperature to the activation temperature of 300 °C at 1 °C / min under nitrogen atmosphere, keep it warm for 0.5 h, and the nitrogen flow rate is 1 L / min. After activation, cool, wash and dry.

[0048] The fourth step, high-temperature modulation: put the above-mentioned activated carbon sample into a tube furnace, raise the temperature ...

Embodiment 2

[0050] The first step is raw material preparation: the coconut shells are air-selected to remove impurities, washed to remove ash, and dried.

[0051] The second step, high-pressure impregnation treatment: prepare phosphoric acid into a solution with a mass concentration of 60%, mix it with the above-mentioned coconut shell according to the mass ratio of raw materials and phosphoric acid at 1:6, place it in a high-pressure stainless steel container, and pass in superheated steam. Immerse at a pressure of 1MPa for 0.5 hours. After decompression, pressurize to 1MPa with steam, and then cycle and impregnate under pressure for 8 hours. Take it out and dry it at 120°C.

[0052] The third step, activation: put the above-mentioned dried mixture into the activation reactor, raise the temperature to the activation temperature of 800 °C at 10 °C / min under nitrogen atmosphere, keep it warm for 5 hours, and the nitrogen flow rate is 1 L / min. After activation, cool, wash and dry.

[0053]...

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Abstract

The invention provides a preparation method of high VOCs (volatile organic compounds) adsorption rate and low desorption residue granular activated carbon. The preparation method comprises the following steps: performing impurity removal on granular shell raw materials, drying, mixing with a chemical agent solution according to a certain ratio, putting into a high pressure resistant vessel, and performing pressure impregnation; transferring the mixture with impregnated activator into an activation reactor, slowly heating to an activation final temperature in an inert atmosphere, keeping the temperature for some time, cooling, recovering the activator, rinsing, and drying to obtain a high specific surface area activated carbon sample; and putting the activated carbon in a carbonization furnace, and performing high-temperature heat treatment to enable mesopores and macropores to shrink to micropores, thereby obtaining granular activated carbon having centralized micropore distribution. The granular activated carbon prepared by the invention has the advantages of high saturated adsorption capacity for VOCs and other gas, low desorption residue and high added value, thereby being suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing residual granular activated carbon with high adsorption rate and low desorption of VOCs, in particular to a granular activated carbon with well-developed micropores prepared by chemical activation and high-temperature modulation of pore size distribution. The product has high adsorption rate and low desorption for VOCs such as methane and methyl ethyl ketone residual features. Background technique [0002] Environmental protection and clean energy are two major development strategies in my country. Activated carbon is an ideal adsorption material for environmental protection and new energy storage because of its developed pores and huge specific surface area. In recent years, the occurrence of large-scale and persistent haze weather has put forward new requirements for atmospheric protection. Volatile organic compounds (VOCs) are one of the culprits that cause haze weather. The particulate matter generat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/342B01D53/02
CPCB01D53/02B01D2253/102B01D2257/708C01P2006/12Y02A50/20Y02C20/20
Inventor 孙康蒋剑春冷昌宇李继辉卢辛成陈超朱光真孟中磊
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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