Preparation method of coal-based carbon molecular sieve

A molecular sieve and coal-based carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of low nitrogen adsorption, large methane adsorption, increased energy consumption, etc., to achieve large adsorption and process conditions Simple, good kinetic separation

Inactive Publication Date: 2019-01-11
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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Problems solved by technology

[0006] Chinese patent CN101804979A discloses a coal-based carbon molecular sieve and its preparation method. Organic matter such as benzene and toluene are mainly used as pore-adjusting agents. The maximum adsorption capacity of nitrogen in the prepared sample is 5.95ml, the maximum adsorption capacity of methane is 17.1ml, and the equilibrium separation coefficient is about 3, and the adsorption capacity of nitrogen is relatively low, and the adsorption capacity of methane is large, which is mainly biased towards equilibrium adsorption, which increases energy consumption in the dynamic adsorption separation project of pressure swing adsorption, which is not conducive to the dynamic separation of methane and nitrogen gas mixture
[0007] Chinese patent 10569

Method used

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  • Preparation method of coal-based carbon molecular sieve

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Experimental program
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Effect test

Embodiment 1

[0022] About 30g of ylang-ylang coal-based activated carbon precursor (when the pore diameter is 0.3-1nm, the pore volume is 0.25-0.30cm3 / g; when the pore size is 1-2nm, the pore volume is 0.05-0.10cm3 / g; The pore volume is 0.08~0.12cm3 / g.), after putting into the high-temperature furnace, first pass nitrogen gas for 15 minutes to drive out the air. Under adjustment, the temperature is raised to a deposition temperature of 850°C. The deposition gas is a mixture of high-concentration methane and nitrogen (the volume fraction of methane is 30%, and the flow rate of methane is 150ml / min). The deposition time is 90 minutes. After the heating is stopped, use the inert gas nitrogen. After cooling to 200°C in a high-temperature furnace at 200ml / min, move the sample to a sealed desiccator, cool to room temperature, and vacuum-seal the package. The pore size distribution of the coal-based carbon molecular sieves below 1 nm after deposition is shown in Table 1 (the pore size distributio...

Embodiment 2

[0024] The deposition time becomes 120min, and all the other test conditions are the same as in Example 1. The pore size distribution of coal-based carbon molecular sieves below 1 nm after deposition is shown in Table 1 (the pore size distribution is calculated by the HK method), see figure 1 , the static nitrogen adsorption capacity and methane adsorption capacity of the prepared coal-based carbon molecular sieve are shown in Table 1.

Embodiment 3

[0026] The deposition time becomes 180min, and all the other test conditions are the same as in Example 1. The pore size distribution of the coal-based carbon molecular sieves below 1 nm after deposition is shown in Table 1 (the pore size distribution is calculated by the HK method). The static nitrogen adsorption capacity and methane adsorption capacity of the prepared coal-based carbon molecular sieves are shown in Table 1.

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Abstract

The invention discloses a preparation method of a coal-based carbon molecular sieve, wherein the preparation method mainly includes the following steps: (1) screening coal-based activated carbon withsuitable pore size; (2) depositing with a methane deposition agent with different concentrations, and adjusting the pore size of coal-based activated carbon to prepare carbon molecular sieve samples;and (3) preparing a carbon molecular sieve sample with large nitrogen adsorption capacity and small methane adsorption capacity, wherein the carbon molecular sieve sample is advantageous to separationin kinetics. The coal-based activated carbon has the advantages of wide pore size range, wide source and low price. The deposited gas is mixed gas of inert gas and methane. The deposited gas has no pollution to the environment. The nitrogen adsorption capacity of the prepared product is large and the equilibrium separation coefficient is small, and dynamic separation of nitrogen and methane is facilitated.

Description

technical field [0001] The patent of the present invention relates to a method for preparing coal-based carbon molecular sieves. Coal-based carbon molecular sieves with sieving effects are prepared by using coal-based activated carbon with a wide pore size distribution range and low cost, which belongs to the field of inorganic materials. Background technique [0002] PSA gas separation is realized in two ways: equilibrium effect and kinetic effect. The molecular dynamic diameters of methane and nitrogen are 0.380nm and 0.364nm respectively. The pore size distribution of activated carbon is wide, and the force with methane is greater than that of nitrogen during adsorption. However, since both are non-polar molecules and the dynamic diameters are different Smaller, the adsorption separation coefficient is not large, and when the equilibrium effect is used to separate methane and nitrogen, the separation is difficult and the energy consumption is large. At present, carbon mo...

Claims

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Application Information

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IPC IPC(8): C01B32/372C01B32/306
CPCC01B32/306C01B32/372
Inventor 王洪亮胡宏杰高照国刘红召曹耀华张博王威柳林
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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