A kind of method for separating krypton and xenon by high silicon-aluminum ratio molecular sieve membrane
A high-silicon-aluminum ratio and molecular sieve technology, applied in the field of krypton-xenon separation, can solve the problem of difficult separation and achieve the effect of reducing storage volume
Active Publication Date: 2022-07-12
NANJING TECH UNIV
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Problems solved by technology
However, the use of membrane separation technology for Kr / Xe separation not only has to overcome the limitation of competitive adsorption, but also the difference in kinetic diameter between the two is smaller (only 0.04nm), and the separation is more difficult.
At present, only a few membranes have reported Kr / Xe separation performance, but none of them can achieve separation in high humidity and irradiation environment
Method used
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[0040] Synthesis of SSZ-13 Molecular Sieve Membrane:
[0041] SSZ-13 molecular sieve membrane was synthesized by secondary growth method. The specific synthesis steps are:
[0042] (1) Preparation of seed crystals: SSZ-13 molecular sieve was prepared from a precursor, and the molar composition of the precursor was 104SiO 2 : 1.1Al 2 O 3 : 10Na 2 O: 20TMAdaOH: 4410H 2 O. Typically, 0.34g NaOH was added to 31.9g deionized water, followed by 8.12g TMAdaOH solution followed by 0.0962g NaAlO 2 . The solution was stirred for 15 minutes between each chemical addition. Finally 3.0 g of fumed silica was added as the silicon source and the resulting solution was stirred for 4 hours. The synthetic liquid was moved to the reaction kettle and put into an oven, and reacted under the condition of 433K for 6 days. The crystals formed were collected and then washed with deionized water until neutral and dried at 353K overnight. In order to reduce the crystal size, a wet ball mill wa...
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Abstract
The invention relates to a method for separating krypton and xenon through a molecular sieve membrane with a high silicon-to-aluminum ratio, belonging to the technical field of gas separation. In the present invention, SSZ-13 and DD3R molecular sieve membranes for Kr / Xe separation are prepared on a porous ceramic carrier. The mass transfer channels of the two molecular sieve membranes are elliptical eight-membered ring channels, showing higher diffusion selectivity. At the same time, thanks to the hydrophobicity of the high silicon-to-aluminum ratio molecular sieve membrane, the separation performance and membrane stability of the molecular sieve membrane are basically not affected by water vapor. The membrane materials involved in the present invention are all aluminosilicate materials, which still maintain stable structure and performance in the nuclear radiation environment, and are radioactive 85 The most promising material for Kr separation. The use of high-silicon molecular sieve membranes for the separation of krypton and xenon can 85 The storage volume of Kr is reduced by 10 times, and the economic benefit is significant.
Description
technical field [0001] The invention relates to a method for separating krypton and xenon through a molecular sieve membrane with a high silicon-to-aluminum ratio, and belongs to the technical field of gas separation. Background technique [0002] Nuclear power plants provide about 10% of global electricity, and in 2017 nuclear power plants provided 2,636 TWh. Compared with the cleanest natural gas power generation technology to date, nuclear power can reduce carbon dioxide emissions by 2.388 billion tons per year. Used nuclear fuel (UNF) is highly radioactive and must be reprocessed to recover plutonium and uranium for use in the fuel cycle, sequester radioactive waste to minimize environmental impact. Volatile radionuclides (mainly the 85 Kr) is released into the plant exhaust gas during the aftertreatment process and eventually into the environment. 85 Kr is a noble gas that can only eliminate radioactivity through natural decay, however its half-life is as long as 10....
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IPC IPC(8): C01B39/48C01B23/00
CPCC01B39/48C01B23/0073C01B23/0047C01P2002/72Y02P20/151
Inventor 王学瑞周韬顾学红
Owner NANJING TECH UNIV