Preparation method of high-adsorptive selectivity activated carbon for separating CO2 and CH4

A selective and activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as limited demand and effect, and achieve the effect of increasing specific content, good separation effect, and excellent separation effect

Active Publication Date: 2015-01-21
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas activation method is an important means of activated carbon activation. The commonly used activation gases are water vapor, carbon dioxide gas and their mixed gases. By changing the activation conditions and processes, only the structure and composition of the pores can be changed, and the adsorption capacity of activated carbon can be improved. The need to increase adsorption selectivity in the process plays a limited role

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] One for the separation of CO 2 and CH 4 The preparation method of activated carbon with high adsorption selectivity uses wood particles as raw materials, carbonizes at 450-600°C under inert gas conditions, puts the carbonized material in an activation furnace, and passes through 10wt% hydrazine hydrate aqueous solution at 800°C to decompose Steam activation treatment for 2 hours, then cooled to room temperature under the protection of inert gas, boiled with water, washed and dried, the obtained activated carbon was at 25°C, 100kPa for CO 2 The adsorption capacity is 2.4mmol / g, under normal temperature and pressure for CO 2 and CH 4 The separation factor was 8.9. Compared with the comparative example (using water vapor as the activator), the effect of activated carbon on CO 2 The adsorption capacity and the CO 2 / CH 4 The adsorption selectivity has been greatly improved.

Embodiment 2

[0012] One for the separation of CO 2 and CH 4 The preparation method of activated carbon with high adsorption selectivity uses wood particles as raw materials, carbonizes at 450-600°C under inert gas conditions, puts the carbonized material in an activation furnace, and decomposes it by passing 20wt% hydrazine hydrate aqueous solution at 700°C Steam activation treatment for 1 hour, then cooled to room temperature under the protection of inert gas, boiled with water, washed and dried. The obtained activated carbon is CO 2 The adsorption capacity is 1.8mmol / g, under normal temperature and pressure for CO 2 and CH 4 The separation factor was 2.3. Compared with the comparative example (using water vapor as the activator), the effect of activated carbon on CO 2 The adsorption capacity and the CO 2 / CH 4 The adsorption selectivity has been greatly improved.

Embodiment 3

[0016] One for the separation of CO 2 and CH 4 The preparation method of activated carbon with high adsorption selectivity, using coconut shell as raw material, carbonizing under inert gas conditions at 450-600°C, placing the carbonized material in an activation furnace, and passing 20wt% hydrazine hydrate aqueous solution at 800°C to decompose Steam activation treatment for 2 hours, then cooled to room temperature under the protection of inert gas, boiled with water, washed and dried. The obtained activated carbon is CO 2 The adsorption capacity is 2.8mmol / g, under normal temperature and pressure for CO 2 and CH 4 The separation factor was 9.6. Compared with the comparative example (using water vapor as the activator), the effect of activated carbon on CO 2 The adsorption capacity and the CO 2 / CH 4 The adsorption selectivity has been greatly improved.

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Abstract

The invention provides a preparation method of high-adsorptive selectivity activated carbon for separating CO2 and CH4. The preparation method comprises the following steps of: carbonizing wood particles, hard husks or coal as raw materials at 450-600 DEG C in the presence of an inert gas, placing the carbonized materials in an activating oven, feeding 10-80 wt% of hydrazine hydrate aqueous solution at 700-900 DEG C so as to decompose steam and carry out activating treatment for 1-3 hours, then cooling to a room temperature under the protection of the inert gas, boiling with water, washing and drying. According to the preparation method, the hydrazine hydrate aqueous solution is used for decomposing steam and activating the carbonized materials, so that the prepared activated carbon has a large surface area, high adsorption property and very high CO2 / CH4 adsorptive selectivity, the adsorption capacity of the activated carbon on the CO2 can reach above 2.8mmol / g at 25 DEG C and 100 kPa, and the separation factor of the activated carbon on the CO2 and the CH4 at a normal temperature and a normal pressure can reach 6-10; and therefore, the activated carbon is very suitable for pressure swing adsorption separation of the CO2 and CH4 in mixed gases.

Description

technical field [0001] The invention relates to a preparation method of activated carbon, in particular to a method for separating CO 2 and CH 4 Preparation method of activated carbon with high adsorption selectivity. Background technique [0002] Pressure swing adsorption is the separation of CH 4 and CO 2 The effective method has the outstanding advantages of low energy consumption, low emission, and stable operation, but there is still the problem of high methane loss rate in practical applications. The key to improving the efficiency of pressure swing adsorption is to prepare an adsorbent with excellent performance. Activated carbon has a highly developed pore structure and a large internal specific surface area. It is an excellent adsorbent for pressure swing adsorption separation, and is increasingly used in pressure swing adsorption. gas separation. The gas activation method is an important means of activated carbon activation. The commonly used activation gases ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/10C01B32/336
Inventor 许海朋张晓东金付强华栋梁张杰
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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