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Method for preparing composite carbon membranes on basis of ceramic tubes used as supports

A technology of composite carbon and ceramic tubes, used in chemical instruments and methods, membranes, membrane technology, etc.

Inactive Publication Date: 2019-02-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims at the technical problems existing in the thermal stability, acid and alkali resistance and membrane fouling of existing polymer membranes in industrial separation, and provides a method for preparing composite carbon membranes based on ceramic tubes as supports. The invented support composite carbon membrane can be used in water treatment or some gas separation

Method used

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  • Method for preparing composite carbon membranes on basis of ceramic tubes used as supports
  • Method for preparing composite carbon membranes on basis of ceramic tubes used as supports
  • Method for preparing composite carbon membranes on basis of ceramic tubes used as supports

Examples

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Embodiment 1

[0019] Embodiment 1: Select the single-hole ceramic tube that has been processed, take thermoplastic phenolic resin as carbon source, hexamethylenetetramine as curing agent, according to 89g N,N-dimethylformamide, 10g thermoplastic phenolic resin, 1g six Prepare the coating solution with the amount of methylenetetramine, spray 10ml of the solution with a spray gun, and after natural drying, increase the temperature to 800°C at a rate of 2.5°C / min, keep the temperature constant for 1h, and use protective gas N 2 The flow rate is 50ml / min and the temperature is naturally cooled to room temperature, and a support composite carbon membrane with no defects and excellent separation performance can be obtained; the average pore size of the composite carbon membrane is: 0.15μm, and it is applied to the gas permeation test of pure components, N 2 Penetration rate 30.2×10 -8 mol / (Pa·s·m 2 ), CO 2 Penetration rate 37.6×10-8 mol / (Pa·s·m 2 );

Embodiment 2

[0020] Example 2: According to different concentrations of thermoplastic phenolic resin coating solution sprayed on the surface of the support and pyrolyzed to prepare a composite separation carbon membrane, the mass concentration of the phenolic resin coating solution is 15%, the heating rate is 5°C / min, and the pyrolysis temperature is 750°C , constant temperature 0.5h, nitrogen flow 50ml / min, the average pore size of the composite carbon membrane is 0.28μm, N 2 Penetration rate 69.5×10 -8 mol / (Pa·s·m 2 ), CO 2 Penetration rate 72.8×10 -8 mol / (Pa·s·m 2 );

Embodiment 3

[0021] Example 3: Prepare a composite separation carbon membrane by spraying according to different pyrolysis temperatures. The mass concentration of the phenolic resin coating solution is 40%, the heating rate is 3°C, the pyrolysis temperature is 800°C, the constant temperature is 1h, and the nitrogen flow rate is 60ml / min. The average pore size of the composite carbon membrane is 0.16 μm, N 2 Penetration rate 36.8×10 -8 mol / (Pa·s·m 2 ), CO 2 Penetration rate 40.3×10 -8 mol / (Pa·s·m 2 );

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Abstract

The invention discloses a method for preparing composite carbon membranes on the basis of ceramic tubes used as supports, and belongs to the technical field of preparation and application of carbon membranes. The ceramic tubes are used as the supports, thermoplastic phenolic resin is used as a carbon source, and the composite carbon membranes with the supports is prepared by the aid of spray processes. The method includes that a layer of membrane coating liquid is sprayed on each single-pore ceramic tube which is used as the corresponding support, vacuum gas exhaust is carried out, first layers of membrane coating liquid are used as intermediate layers, spray is carried out again, nitrogen in muffle furnaces is ultimately used as inert shielding gas, the gas flow is 30-100 ml / min under thecontrol, the heating and cooling rates and the heat preservation time are controlled by controllers, the heating rates are 3-10 DEG C / min, the carbonization final temperatures are 750-900 DEG C, thetemperatures keep constant for 0.5-1 h, and then natural cooling is carried out until the temperatures reach the room temperature so as to obtain the composite carbon membranes with the supports. Themethod has the advantages that N, N-dimethylformamide is used as a solvent, hexamethylenetetramine is used as a curing agent, and accordingly thermoplastic phenolic resin spray solution can be prepared; potassium carbonate is added into the spray solution to be used as an activator for improving pore structures of the carbon membranes, accordingly, the separation performance of the carbon membranes with the supports can be improved, and the carbon membranes with the supports can be used for gas separation, water treatment and the like and are good in separation performance.

Description

Technical field: [0001] The invention belongs to the technical field of carbon membrane preparation and application thereof, and in particular relates to a preparation method of a composite carbon membrane based on a ceramic tube as a support body. Background technique: [0002] As a separation method with high separation performance, membrane separation technology has become an important separation treatment method in water treatment, gas separation, food processing, biochemical industry, etc. It realizes the separation, classification, and purification of gas or liquid mixed with two or more components by means of the concentration difference between the components to be separated, the difference in solubility, and the osmosis of the internal and external pressure difference when passing through the membrane. , Concentration and enrichment technology has the advantages of simple process, no secondary pollution, high efficiency and energy saving. For the separation of comp...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/10B01D69/12
CPCB01D67/0039B01D67/0041B01D67/0067B01D69/10B01D69/105B01D69/12B01D2325/22
Inventor 张小勇邓昆岭郑明东张代林
Owner ANHUI UNIVERSITY OF TECHNOLOGY