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Pore adjusting method for coal based carbon film

A carbon membrane and coal-based technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex control process and difficult pore size, and achieve the effect of simple process, easy operation and direct control

Inactive Publication Date: 2005-11-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of complex regulation process and difficult regulation of pore size existing in the existing carbon membrane pore regulation technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 40g of binder and 20g of polyvinyl butyral into a beaker, and stir immediately with a clean glass rod so that they can be evenly dispersed in the binder. Then weigh 80g of coal powder, put it into the mixer with the mixture of binder and polyvinyl butyral at the same time, mix evenly, and press out the original film through the molding machine. Let it dry at room temperature for 10 hours, put it into a carbonization furnace, and under the protection of argon, raise the temperature to 900°C at a rate of 3°C / min and keep the temperature constant for 30 minutes. It can be taken out after cooling to below 100°C. After testing, the average pore size of the carbon membrane is 50nm, the porosity is 41%, at 20°C, 0.2Mp N 2 The permeation flux is 1.371×10 -5 cm 3 .cm / (cm 2 .s.cmHg)

Embodiment 2

[0017] Weigh 40g of binder and 25g of styrene-acrylonitrile copolymer into a beaker, and stir immediately with a clean glass rod so that they can be evenly dispersed in the binder. Then weigh 80g of coal powder, put it, the mixture of binder and styrene-acrylonitrile copolymer into the mixer at the same time, mix it evenly, and press it out of the original film through the molding machine. Let it dry at room temperature for 10 hours, put it into a carbonization furnace, and under the protection of argon, raise the temperature to 900°C at a rate of 3°C / min and keep the temperature constant for 30 minutes. It can be taken out after cooling to below 100°C. After testing, the average pore size of the carbon membrane is 100nm, and the porosity is 48%. 2 The permeate flux is 7.371×10 -5 cm 3 .cm / (cm 2 .s.cmHg)

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Abstract

A method for regulating the diameter of pores in the coal-base carbon membrane features that in the process for preparing the coal-base carbon membrane, a certain quantity of pore forming agent is used, which can be thermolyzed in carbonization to release the gas and form the pore structure with average pore diameter.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a method for adjusting pores of a carbon membrane, in particular to a method for adjusting pores of a coal-based carbon membrane. Background technique [0002] At present, there are many methods for regulating the pores of carbon membranes. Kusakable et al. O 2 To activate the medium, an activation method is used to adjust the pore structure. Since the gas released from the carbon film during the carbonization process will decompose into carbon particles at high temperature, these carbon particles will block some of the pores formed during carbonization, thereby forming dead-end pores. During activation, the carbon particles that block the pores of the membrane contact with the activation medium, and an oxidation reaction occurs to generate CO or CO 2 , so that the dead end pores are opened to obtain through holes, which improves the permeation flux and specific surface ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02
Inventor 王同华宋成文
Owner DALIAN UNIV OF TECH