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Composite carbon diaphragm with mesoporous and microporous gradient structure and preparation method for diaphragm

A pore structure, composite carbon technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of simple and easy preparation process, high mechanical strength, and high separation selectivity

Active Publication Date: 2012-07-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process is simple, a substance called triethyl orthoacetate must be added during the synthesis process to enhance the stability of the ordered mesoporous structure.

Method used

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  • Composite carbon diaphragm with mesoporous and microporous gradient structure and preparation method for diaphragm
  • Composite carbon diaphragm with mesoporous and microporous gradient structure and preparation method for diaphragm
  • Composite carbon diaphragm with mesoporous and microporous gradient structure and preparation method for diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolving 10g of mesoporous phenolic resin in DMAc is configured into a film-making solution with a mass percentage concentration of 58%, and is coated on the surface of a porous carbon plate or a carbon tube support body with a pore size of 360nm by spin coating. Dry at a temperature of 80°C for 30 hours to make a composite polymer film; put it into a carbonization furnace, and under the protection of nitrogen with a flow rate of 200ml / min, heat it to 750°C at a heating rate of 1°C / min for high-temperature carbonization. After 1h, it was naturally cooled to normal temperature to obtain a composite interlayer carbon film with a mesoporous structure; The imide membrane-making solution was sprayed on their surfaces to form a separation layer, and dried at a temperature of 30°C for 20 hours, and then at a temperature of 80°C for 25 hours to form a mesoporous composite polymer membrane. Then put it into a carbonization furnace, under the protection of nitrogen with a flow ...

Embodiment 2～4

[0030] The procedure of Example 1 was repeated on the supports specified in Table 1 below, where the test results are listed.

[0031] Table 1

[0032]

Embodiment 5

[0034]The 10g mesoporous polymer specified in Table 1 is configured in DMAc as a film-making solution with a mass percentage concentration of 20%, and is coated on the surface of a porous carbon plate support with a pore size of 230nm by scraping. Dry at ℃ for 28 hours to make a composite polymer film; put them into a carbonization furnace respectively, under the protection of nitrogen with a flow rate of 200ml / min, heat to 800℃ at a heating rate of 2℃ / min for high-temperature carbonization, and the constant temperature time is 2h After that, it was naturally cooled to room temperature to obtain a composite interlayer carbon membrane with a mesoporous structure. Then adopt the method of spin coating to spray the microporous cyanate resin film-making liquid with a mass percentage concentration of 13% and the solvent of N-methylpyrrolidone on the surface to form a separation layer, and first dry it at a temperature of 40 ° C. 15h, and then dried at 80°C for 20h to make a mesopor...

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Abstract

The invention relates to a composite carbon diaphragm with a mesoporous and microporous gradient structure and a preparation method for the diaphragm. The composite carbon diaphragm with the mesoporous and microporous gradient structure consists of a porous support body, a mesoporous intermediate layer and a surface separation layer, and is characterized in that the pore diameter of the porous support body is 100 to 500 nanometers, the breaking strength is 2 to 15MPa, and the anti-explosion strength is 3 to 10MPa; the pore diameter of the mesoporous intermediate layer is 2 to 10 nanometers, the specific surface area is 400 to 1,000 m<2> / g, the porosity is 30 to 50 percent, and the thickness is 1 to 10 micrometers; and the pore diameter of the surface separation layer is 0.3 to 0.5 nanometer, the specific surface area is 300 to 600 m<2> / g, the porosity is 20 to 40 percent, and the thickness is 0.1 to 5 micrometers. By the composite carbon diaphragm with the mesoporous and microporous gradient structure, the phenomenon that the gas separation performance of the composite carbon diaphragm is greatly reduced due to the defect of the surface of the support body is avoided, and the permeability of the prepared composite carbon diaphragm is improved obviously on the basis of keeping high gas separation selectivity.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a carbon membrane and a preparation method thereof, in particular to a composite carbon membrane with a mesomicro-gradient pore structure and a preparation method thereof Background technique [0002] Membrane separation technology is a new high-tech, but also a multi-disciplinary interdisciplinary science and technology. As a new type of separation technology, gas separation membrane technology has the technical characteristics of "high efficiency, economy, convenience and cleanness" compared with traditional gas separation technologies. It has broad application prospects in gas removal, recovery of hydrogen and organic hydrocarbon gases in petrochemical and ammonia synthesis tail gases. [0003] Carbon membrane is a new type of carbon-based membrane material prepared by high-temperature pyrolysis and carbonization of precursor polymers. Because of its developed nanoscale ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/10B01D69/12B01D67/00
Inventor 王同华李琳张煜陈安亮曹越
Owner DALIAN UNIV OF TECH
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