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Supported composite carbon molecular sieve membrane

A composite carbon and molecular sieve technology, applied in the field of membrane separation, can solve the problems of limited industrial application, low permeability and high brittleness of carbon molecular sieve membrane, and achieve the effect of improving mechanical properties, excellent gas separation performance and high repeatability.

Active Publication Date: 2016-06-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the low permeability of the carbon molecular sieve membrane itself, generally no more than 5GPU, and the high brittleness of the material, its further industrial application is limited to some extent.

Method used

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  • Supported composite carbon molecular sieve membrane
  • Supported composite carbon molecular sieve membrane
  • Supported composite carbon molecular sieve membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preparation of microporous material ZIF-108:

[0051] Weigh 0.318 gram of zinc acetate dihydrate (Zn(Ac) 2 2H 2 O) was dissolved in 16 ml of nitrogen, nitrogen-dimethylformamide (DMF), and 0.328 g of 2-nitroimidazole (nim) was dissolved in 40 ml of nitrogen, nitrogen-dimethylformamide. Add the former to the latter and mix at room temperature for 2.5 hours. After the reaction is completed, centrifuge and wash with 20 ml of nitrogen, nitrogen-dimethylformamide ultrasonically for 15 minutes each time, and the product is ready for use.

[0052] X-ray diffraction detection product: with regular crystal form (such as figure 1 ), respectively, the scanning electron microscope pictures show that the product has a uniform morphology (such as figure 2 ), the particle size is nanoscale. N 2 Adsorption experiments proved that the material has a microporous structure ( image 3 ), its specific surface area is 1371m 2 / g.

[0053] Thermogravimetric analysis experiments p...

Embodiment 2

[0070] 1. Prepare the carbon molecular sieve membrane product D according to steps 2 to 4 in the preparation method of the product A in Example 1, wherein the method for preparing the film-forming raw material in the step 2 is:

[0071] Weigh directly 1.1916 grams of polymer P84, press W P84 :W DMF =1:12.7 ratio Add 15.0835 g of DMF to prepare polymer solution, stir for 24 hours, where W represents mass.

[0072] 2. Permeability and selectivity are two important indicators to evaluate the gas separation performance of the membrane, and the permeability (P i ) and separation coefficient (α ij ) to represent. Permeability P i =J i / A*ΔP, where J i is the permeation flow rate of the gas, unit molm -2 the s -1 , A is the effective membrane area, unit m 2 , ΔP is the pressure difference on both sides of the membrane, unit Pa; separation coefficient α ij =P i / P j , where P i is the permeability of gas i, P j is the permeability of gas j. The gas permeability of the s...

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Abstract

The invention discloses a supported composite carbon molecular sieve membrane. The supported composite carbon molecular sieve membrane is prepared by the following method: a. preparing a membrane-forming raw material: uniformly mixing a microporous material, a polymer material and a solvent; b. coating the surface of a carrier with the membrane-forming raw material prepared in the step a, and drying; and c. performing high-temperature carbonizing treatment. A certain metal element and a nitrogen-containing substance are introduced into the carbon molecular sieve membrane in a high-temperature pyrolysis process, so that permeability of the membrane is improved to a certain extent. The supported composite carbon molecular sieve membrane is high in preparation repeatability, and the prepared supported composite carbon molecular sieve membrane has excellent gas separation performance and has a wide application prospect in the field of gas separation.

Description

technical field [0001] The invention belongs to the field of membrane separation, and in particular relates to the preparation of a supported composite carbon molecular sieve membrane for gas separation. Background technique [0002] Compared with the traditional separation technology, the gas membrane separation technology has many advantages such as low energy consumption, simple device and less environmental pollution. Therefore, it has a wide range of applications in the fields of natural gas purification, hydrogen recovery, oxygen-enriched, nitrogen-enriched, and separation of alkenes and alkanes. Application prospects. [0003] Carbon molecular sieve membrane is a new type of inorganic membrane material prepared by high-temperature pyrolytic carbonization of the precursor of carbon-containing materials under the protection of an inert atmosphere. Since the carbon material itself has a uniform pore size and rich microporous structure, the carbon molecular sieve membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 杨维慎矫文美李砚硕
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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