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Preparation process of coal-based flat-sheet composite carbon membrane

A technology of composite carbon and flat plate, applied in the field of membrane materials, can solve the problems of poor composite effect of support and precursor, high price, brittle texture, etc., and achieve the effects of high mechanical strength, energy saving and smooth surface

Inactive Publication Date: 2011-11-23
张永昶
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Problems solved by technology

However, this homogeneous carbon film is only suitable for laboratory research due to its brittle and fragile texture.
Although the composite carbon membrane has great industrial application value, the supports used by most researchers are ceramics and stainless steel. These supports must have a concentrated pore size distribution and a small average pore size, and often require multi-layer modification, so the price is expensive. However, it limits its wide application; some researchers also choose stainless steel with a wider pore size distribution as the carbon membrane support. Although the price is lower, the composite effect between the support and the precursor is poor. Modification of the pore structure of the support

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] The coal is crushed to a size of 5um by crushing equipment.

[0027] Mix the coal powder and the binder at a ratio of 90:1, and knead them evenly in a kneader so that the surface of the coal particles is uniformly wetted and covered by the binder.

[0028] The mixed mud is naturally dried at room temperature to remove excess water in the mud.

[0029] Crush the obtained dry material to about 200 mesh, put it into the tail of the mold, and use 800N / m 2 The molding pressure was maintained for 5 hours to obtain the original film support and dried at a constant temperature.

[0030] Put the dried original film support into a carbonization furnace, raise the temperature to 950°C at a rate of 3°C / min under the protection of nitrogen, keep the temperature constant for 0.5h, and cool naturally to room temperature.

[0031] Polish the outer surface of the cooled coal-based flat carbon membrane support with water sandpaper (2000#) to remove surface burrs and obvious protrusions...

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Abstract

The invention provides to a spin-coating preparation process of a coal-based flat-sheet composite carbon membrane, relating to the technical field of membrane materials and aiming at preparing a composite carbon membrane by selecting a low-cost coal-based flat-sheet carbon membrane support body and adopting a spin-coating technology. The invention has the advantages of simple production method and low cost; the coal-based flat-sheet composite carbon membrane has the characteristics of high mechanical strength and high gas flux; in addition, a method for preparing the composite carbon membrane on the basis of preparing the low-cost coal-based flat-sheet carbon membrane support body and exploring to improve the compound effect of the low-cost coal-based flat-sheet carbon membrane support body and a precursor becomes a key of accelerating the industrialization process of carbon membranes.

Description

[technical field] [0001] The invention relates to the technical field of membrane materials, in particular to a spin-coating preparation process of a coal-based flat composite carbon membrane. [Background technique] [0002] Carbon membrane is a new type of high-efficiency and energy-saving material for gas separation. It is formed by high-temperature thermal decomposition of carbon-containing substances under inert gas or vacuum protection conditions. Pore ​​structure, so it shows high separation selectivity and permeability to gas. Flat homogeneous carbon film refers to the preparation of the prepared polymer precursor solution directly on a flat glass plate to form a film under certain temperature and humidity conditions, and then carbonized after drying. This is currently the most researched A carbon membrane. However, this homogeneous carbon film is only suitable for laboratory research due to its brittle and fragile texture. Although the composite carbon membrane ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/06B01D67/00B01D69/12
Inventor 张永昶
Owner 张永昶
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