Method for Measuring Surface-Interface Mass Transfer Coefficient and Pore Diffusion Coefficient of Porous Media

A technology of porous media and mass transfer coefficient, applied in the field of measurement, can solve the problems of large error and unclear physical meaning of mass transfer coefficient of porous media, and achieve the effect of improving performance, speeding up implementation progress and improving production efficiency.

Active Publication Date: 2021-03-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for measuring the surface-interface mass transfer coefficient and the internal diffusion coefficient of the guest molecule in the porous medium material, so as to solve the unclear physical meaning of the porous medium mass transfer coefficient obtained in the existing method, big error problem

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  • Method for Measuring Surface-Interface Mass Transfer Coefficient and Pore Diffusion Coefficient of Porous Media
  • Method for Measuring Surface-Interface Mass Transfer Coefficient and Pore Diffusion Coefficient of Porous Media
  • Method for Measuring Surface-Interface Mass Transfer Coefficient and Pore Diffusion Coefficient of Porous Media

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Experimental program
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Embodiment 1

[0051] In Example 1, the change of the weight of the SAPO-34 molecular sieve catalyst (with an average characteristic length of crystals of 8 microns) with time was measured by a microbalance to obtain the relationship of the change of the adsorption amount with time. In Example 2, the relationship between the adsorption amount and the time was obtained by detecting the change of the concentration of the atmosphere in which the SAPO-34 molecular sieve catalyst (the average characteristic length of the crystal is 5 microns) with time. In Example 3, the relationship of the adsorption amount with time was obtained by detecting the change of the infrared light intensity at the characteristic peak of the infrared spectrum by the SAPO-34 molecular sieve catalyst (the average crystal characteristic length of 50 microns) by infrared spectroscopy. In Example 4, the change of the weight of the SAPO-34 molecular sieve catalyst (the average characteristic length of crystals is 2 microns) w...

Embodiment 2

[0055] Before starting to measure the mass transfer performance of SAPO-34 molecular sieve catalyst (the average crystal characteristic length is 5 microns), it is necessary to pre-mix the adsorption sample cell with a nitrogen atmosphere containing 10% n-propanol saturated steam, and set the adsorption sample. The temperature of the cell was 70°C. The SAPO-34 molecular sieve catalyst synthesized in the laboratory was loaded into the sample cell tray to detect the concentration change of the adsorption atmosphere after the SAPO-34 molecular sieve catalyst entered the sample cell atmosphere. Before testing the transient adsorption rate curve, the sample of SAPO-34 molecular sieve catalyst needs to be pretreated by vacuum dehydration, and the dehydrated SAPO-34 molecular sieve catalyst is sent to the adsorption sample cell for the adsorption of n-propanol gas. Under this condition, it is equivalent to a given pressure pulse of 1.2 mbar, the used pressure increase rate is about 1...

Embodiment 3

[0057] The SAPO-34 molecular sieve catalyst synthesized in the laboratory (the average crystal characteristic length of 50 microns) was loaded into the in-situ infrared sample cell to detect the change of the methanol adsorption characteristic peak intensity after the SAPO-34 molecular sieve catalyst adsorbed methanol molecules. Before testing the transient adsorption rate curve, the sample of SAPO-34 molecular sieve catalyst needs to be pretreated by vacuum dehydration. Under the set dehydration conditions, scan the infrared spectrum of the SAPO-34 molecular sieve catalyst until the SAPO-34 obtained by scanning The test of the transient adsorption rate curve can only be carried out after the infrared spectrum of the molecular sieve does not change with time. Methanol was selected as the adsorption guest molecule, and the temperature of the SAPO-34 molecular sieve catalyst was kept at 25 °C, the pressure reached after the given pressure controller pulse was 1.2 mbar, and the pr...

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Abstract

The present application discloses a method for measuring the surface-interface mass transfer coefficient and the diffusion coefficient in the pores of a porous medium. process; according to the equilibrium adsorption amount that the porous medium can achieve under the corresponding concentration or pressure condition, process the obtained adsorption amount change data; determine the control steps for the mass transfer of the porous medium to establish the concentration or pressure change disturbance After the mass conservation equation of the porous medium system, and mathematical processing, the control equation describing the adsorption amount change process is obtained; through the established control equation, the adsorption amount change process of the porous medium with time is fitted and calculated, and the porous medium can be obtained at the same time. The surface-interface mass transfer coefficient and the intra-pore diffusion coefficient.

Description

technical field [0001] The application relates to a method for measuring the surface interface mass transfer coefficient and the diffusion coefficient in the pores of a porous medium, belonging to the technical field of measurement. Background technique [0002] The intra-pore diffusion properties of porous media can significantly affect and control the apparent chemical reaction rate and product selectivity. Based on the different diffusion properties in the pores, porous media materials are widely used in different catalytic systems and separation systems, in order to achieve directional generation and separation of the desired products. Characterizing the intrapore diffusion coefficient of porous media is of great significance for revealing the reaction mechanism, guiding the development and application of materials, and optimizing process conditions. Therefore, it is of great significance to quantitatively measure the intra-pore diffusion coefficient of porous media, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 叶茂高铭滨李华刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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