Uniform ultra-microporous activated carbon for gas separation and preparation method of uniform ultra-microporous activated carbon

A gas separation, ultra-microporous technology, applied in hydrogen separation, chemical instruments and methods, hydrogen separation by selective and reversible absorption, etc., can solve problems such as difficulty in effectively tailoring the pore size distribution of products, equipment corrosion, and high production costs. Achieve the effect of favorable carbon source loading, increased equipment capacity, and increased porosity

Inactive Publication Date: 2017-03-22
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The KOH activation method has the following disadvantages in the process of industrial production of activated carbon: (1) The activation yield is low, the carbon consumption is large, and the production cost is large
(2) KOH is highly corrosive to the structural materials of the reactor under high temperature conditions, the equipment construction cost is high, and the service life is short; (3) The amount of washing water is large, and sometimes hydrofluoric acid is required, resulting in a large amount of high-concentration alkaline fluorine-containing wastewater emission, causing serious environmental pollution
Therefore, it is not suitable to generate a specific pore structure by using a single gas activation, and it is difficult to greatly control the pore structure characteristics.
[0006] In summary, the currently used activated carbon preparation process for gas separation has problems such as difficulty in effectively tailoring the pore size distribution of the product, high production cost, difficult control of reaction conditions, low production efficiency, serious equipment corrosion, and serious pollution.

Method used

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  • Uniform ultra-microporous activated carbon for gas separation and preparation method of uniform ultra-microporous activated carbon
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  • Uniform ultra-microporous activated carbon for gas separation and preparation method of uniform ultra-microporous activated carbon

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Embodiment 1

[0029] A uniform ultramicroporous activated carbon for gas separation and a preparation method thereof, comprising the steps of:

[0030] Step 1. Grinding and pulverizing the raw material semi-coke, passing through a 150-200 mesh sieve, drying to obtain blue-coke powder, mixing KOH accounting for 15wt% of the raw material semi-coke, activating agent accounting for 5wt% of the raw material semi-coke and water to prepare into an impregnating liquid, wherein the quality of water is 0.8 times that of the raw material semi-coke; then add the semi-coke to the impregnating liquid and soak at room temperature for 24 hours to obtain the preparatory material;

[0031] Step 2, the preparatory material that step 1 is made moves in the tubular furnace, in N 2 Controlled thermal decomposition under protective atmosphere, where N 2 The flow rate of the protective atmosphere is 200~250ml / min; the control thermal decomposition is to first raise the temperature of the tube furnace to 370°C at ...

Embodiment 2

[0035] A uniform ultramicroporous activated carbon for gas separation and a preparation method thereof, comprising the steps of:

[0036] Step 1: Grind industrial waste semi-coke powder, pass through a 150-200 mesh sieve, and dry to obtain semi-coke powder. Mix KOH accounting for 10 wt% of the raw material semi-coke, an activation aid accounting for 10 wt% of the raw material semi-coke, and water. Prepare an impregnating solution, wherein the quality of water is 1.2 times that of the raw material semi-coke; then add the semi-coke to the impregnating solution and soak at room temperature for 18 hours to obtain a preparatory material;

[0037] Step 2, the preparatory material that step 1 is made moves in the tubular furnace, in N 2 Controlled thermal decomposition under protective atmosphere, where N 2 The flow rate of the protective atmosphere is 200ml / min; the control thermal decomposition is to first raise the temperature of the tube furnace to 350°C at a heating rate of 4~6...

Embodiment 3

[0041] A uniform ultramicroporous activated carbon for gas separation and a preparation method thereof, comprising the steps of:

[0042] Step 1. Grind industrial waste semi-coke powder, pass through a 150-200 mesh sieve, and dry to obtain semi-coke powder. Mix KOH accounting for 5wt% of the raw material semi-coke, an activation aid accounting for 10wt% of the raw material semi-coke, and water. Prepare an impregnation solution, wherein the quality of water is 1.2 times that of the raw material semi-coke; then add the semi-coke to the impregnation solution and soak at room temperature for 12 hours to obtain a preparatory material;

[0043] Step 2, the preparatory material that step 1 is made moves in the tubular furnace, in N 2 Controlled thermal decomposition under protective atmosphere, where N 2 The flow rate of the protective atmosphere is 300ml / min; the control thermal decomposition is to first raise the temperature of the tube furnace to 400°C at a heating rate of 4~6°C / ...

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Abstract

The invention relates to uniform ultra-microporous activated carbon for gas separation and a preparation method of the uniform ultra-microporous activated carbon. According to the technical scheme of the preparation method, mixing semi-coke with KOH in a mass ratio being 1: (0.01-0.2), adding water and an activating aid to impregnate the mixture for 1-36 h; increasing the temperature to 800-950 DEG C in a programmed manner under N2 protection, controlling thermal decomposition, and introducing water for activation of part of steam for 0.5h-1.5h; finally, washing the mixture with acid and water until the mixture is neutral to obtain the uniform ultra-microporous activated carbon. The pore size is distributed centrally between 0.45 and 0.55 nm, the pores belong to ultra-micropores and have microporosity of 70% or more, and the adsorption capacity of hydrogen is 77cm<3>/g or higher. The semi-coke is taken as a raw material, low in price and low in energy consumption and needs not to be carbonized; an activation method integrates KOH impregnation pretreatment and activation of part of steam, little KOH is consumed, and the activation method has the characteristics of being low in cost and pollution, helpful for reducing corrosion of equipment and the like. The activated carbon prepared with the method has the characteristics of uniform pore size distribution, extremely rich ultra-microporous structure and the like, and can be used in gas separation fields such as pressure swing adsorption hydrogen making or hydrogen storage and the like.

Description

technical field [0001] The invention belongs to the technical field of functional activated carbon preparation. In particular, it relates to a uniform ultramicroporous activated carbon for gas separation and a preparation method thereof. Background technique [0002] Gas adsorption separation technology has many advantages such as high efficiency, energy saving and environmental protection, simple process, etc., and has been widely used in chemical industry, metallurgy, medicine and health, environmental protection and biological engineering and other fields. The key to the application of adsorption separation technology is the adsorbent, and activated carbon is one of the common gas adsorbents. Because its adsorption strength to gas is relatively moderate, it makes desorption easier. Therefore, in the process of gas separation, activated carbon as an adsorbent Often superior to other adsorbents. The key to improving the gas separation factor in industry is that the adsorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/33C01B32/348C01B3/50
CPCC01B3/508C01P2004/04C01P2006/12C01P2006/17
Inventor 童仕唐张景灿张春桃
Owner WUHAN UNIV OF SCI & TECH
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