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Method for purifying xenon by adopting DD3R molecular sieve membrane

A technology of molecular sieve and xenon, which is applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of miniaturization and portability of anesthesia ventilators, and achieve improved membrane permeation flux, high safety, biophase Good capacitive and antibacterial properties

Active Publication Date: 2020-11-03
NANJING TECH UNIV
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Problems solved by technology

KlausSchmidt of Germany disclosed a method for recovering anesthesia xenon gas by using a carbon membrane (US 2010 / 0031961), but the membrane flux is only ~5×10 -9 (J.Membr.Sci. 2007,301,29-38), unable to meet the technical requirements of miniaturization and portability of anesthesia ventilator

Method used

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  • Method for purifying xenon by adopting DD3R molecular sieve membrane
  • Method for purifying xenon by adopting DD3R molecular sieve membrane
  • Method for purifying xenon by adopting DD3R molecular sieve membrane

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Embodiment Construction

[0034] The preparation process of the DD3R molecular sieve membrane used in the following examples can refer to the prior art, for example, CN110745839A "Activation Process of a Defect-Free DD3R Molecular Sieve Membrane".

[0035] Evaluation of DD3R Membrane Separation Performance by Single Component Gas Permeability

[0036] For He,H 2 ,CO 2 ,N 2 ,CH 4 ,Xe and SF 6 Monocomponent gases such as CO 2 Exhibits the highest permeability characteristics at 1.5×10 -7 mole m -2 ·s -1 ·Pa -1 ( figure 2 area a). Due to the thin wall thickness of the hollow fiber carrier, the ratio of the DD3R molecular sieve membrane supported by it to the tube type (~0.84×10 -7 mole m -2 ·s -1 ·Pa -1 ) and slice (1.12×10 -7 mole m -2 ·s -1 ·Pa -1 ) The throughput of the carrier is high (Microporous and Mesoporous Materials, 68(2004) 71-75 and Journal of Membrane Science, 505 (2016) 194-204). In addition, the packing density of hollow fibers is higher. for CO 2 / He,CO 2 / H 2 , ...

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Abstract

The invention provides a method for purifying xenon by adopting a DD3R molecular sieve membrane. A DD3R molecular sieve membrane on-line recycling technology for xenon in a closed-circuit medical xenon anesthesia process is developed. The permeability of the single-component carbon dioxide is 1.5 * 10<-7> mol / m<2>*s*Pa, and the separation selectivity of the carbon dioxide to xenon is 570. The permeation flux is one order of magnitude higher than that of the traditional membrane material. Due to the all-silicon characteristic of the DD3R molecular sieve membrane, the permeability of CO2 is slightly influenced by water vapor, which is different from the situation that pores of an aluminum-containing molecular sieve membrane are extremely easy to block due to water adsorption. In addition, the hollow fiber DD3R molecular sieve membrane has the advantages of high CO2 flux, high CO2 / Xe selectivity and long-time stability, thereby ensuring the favorable prospects of the hollow fiber DD3R molecular sieve membrane in online reuse of medical anesthetic xenon.

Description

technical field [0001] The invention relates to a method for purifying xenon gas by using a DD3R molecular sieve membrane, which belongs to the technical field of gas separation. Background technique [0002] The preparation and purification of noble gases is an extremely challenging process. As an extremely precious rare gas, xenon is widely used in the fields of semiconductor manufacturing, optical power supply, aviation and medical imaging and anesthesia. At present, xenon can only be obtained by further cryogenic rectification of air separation tail gas. Due to the extremely low abundance of xenon in the air (0.087ppmv), the energy consumption for separation is extremely high, and the price of xenon is between $30,000 and $60,000 / m 3 gas,STP . Apart from this, increasing industrial demand is restrained by limited supply in xenon market. It is estimated that even if all air separation units in the world are equipped with xenon extraction units, its supply will be les...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B23/00B01D53/22
CPCB01D53/228C01B23/0047C01B2210/0012C01B2210/0037C01B2210/0046C01B2210/0051B01D2256/18B01D2257/102B01D2257/504Y02P20/151
Inventor 王学瑞顾学红
Owner NANJING TECH UNIV
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