A method for measuring the gas separation performance of carbon molecular sieve pressure swing adsorption based on the principle of liquid suction and gas displacement

A technology of carbon molecular sieve and pressure swing adsorption, which is applied in the fields of suspension and porous material analysis, measuring device, permeability/surface area analysis, etc. evaluation criteria etc.

Active Publication Date: 2017-10-17
DALIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, this method has not formed a unified evaluation standard in the industry. Different pressure swing adsorption devices and different experimental conditions are not comparable in evaluating the gas separation performance of the same adsorbent; at the same time, different adsorbents on the same device require different optimal experimental conditions.

Method used

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  • A method for measuring the gas separation performance of carbon molecular sieve pressure swing adsorption based on the principle of liquid suction and gas displacement
  • A method for measuring the gas separation performance of carbon molecular sieve pressure swing adsorption based on the principle of liquid suction and gas displacement
  • A method for measuring the gas separation performance of carbon molecular sieve pressure swing adsorption based on the principle of liquid suction and gas displacement

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In this example, six kinds of carbon molecular sieves (CMS-1 to CMS-6) for air separation were used to carry out water absorption and displacement of O 2 / N 2 In the experiment, the kinetic curve of liquid suction and gas displacement and the equilibrium gas displacement volume V e (ml / g), such as figure 1 , 2 shown. With the help of pseudo-second-order kinetic adsorption (PSO) model and linear driving force (LDF) model for linear simulation, analysis and comparison of their linear correlation coefficient R 2 and kinetic parameters (shown in Tables 1 and 2), determine the kinetic speed control step in the process of water absorption and gas drive, and calculate the value of selectivity coefficient K, as shown in Table 3.

[0030] By analyzing the six kinds of carbon molecular sieves in Table 3, water flooding O 2 / N 2 The speed control step and K value of the process, and the nitrogen production performance of pressure swing adsorption air separation are summarize...

Embodiment 2

[0036] In this example, four kinds of carbon molecular sieves (CMS-1~CMS-4) were used to carry out water absorption and flooding at 30°C with a constant volume liquid absorption and gas displacement device. 2 / CH 4 In the experiment, the kinetic curve of liquid suction and gas displacement and the equilibrium gas displacement volume V e (ml / g), such as figure 1 , 2 shown. The pseudo-second-order kinetic adsorption (PSO) model and the linear driving force (LDF) model were used to perform linear simulation to determine the kinetic speed control step of the water absorption and gas displacement process, and to calculate the value of the selectivity coefficient K, as shown in Table 6. The law of K value: CMS-1>CMS-2>0>CMS-3>CMS-4, corresponding to the law of gas separation effect: CMS-1 CMS-3>CMS-4. The K value of CMS-2 is closest to 0, so it is most suitable for pressure swing adsorption separation of N 2 / CH 4 craft.

[0037] Table 1 PSO model and LDF model simulate ...

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Abstract

The invention discloses a method of measuring the variable-pressure absorption gas separation performance of a carbon molecular sieve on the basis of a liquid absorption gas flooding principle. According to the method, a carbon molecular sieve of a saturated adsorption gas probe is immersed into a liquid probe; a liquid absorption gas flooding experiment is performed under a constant volume condition; a liquid absorption gas flooding kinetic curve and a balanced gas flooding quantity are obtained. Through the adsorption kinetic model simulation, the dynamic mechanism and the gas selectivity coefficient K are determined, and are used for judging the micropore opening dimension relative dimension rule, the distribution uniformity and the micropore volume relative dimension of the carbon molecular sieve; further, the method for evaluating the variable-pressure adsorption gas separation performance of the carbon molecular sieve is built. The method has the advantages that the carbon molecular sieve with the micropore opening dimension and the micropore volume meeting the gas separation requirement can be accurately judged in the aspects of the adsorption mechanism and the pore structure; high selectivity can be ensured; higher adsorption volume can also be ensured.

Description

technical field [0001] The invention relates to a new method for measuring the gas separation performance of carbon molecular sieve pressure swing adsorption based on the principle of liquid absorption and gas displacement, and belongs to the technical field of gas separation. Background technique [0002] Carbon Molecular Sieve (Carbon Molecular Sieve, CMS) is one of the common non-polar carbonaceous materials, which belongs to bimodal pore size distribution materials, mainly including ultramicropore (<0.7nm) structure and macropore structure with narrow pore size distribution. The orifice of the ultra-micropore is molecular size, which can sieve molecules of different sizes, and is suitable for kinetically selective separation of gas mixtures. It is commonly used in pressure swing adsorption air separation for nitrogen production, air separation for oxygen production, and CO recovery. 2 , recovering and refining hydrogen, purifying coalbed methane (CH 4 , N 2 and othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 徐绍平贾忻宇
Owner DALIAN UNIV OF TECH
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