Method for preparing medical oxygen from mixed gases containing oxygen air components through multi-cycle membrane separation
A technology for oxygen-containing air and membrane separation, applied in reverse osmosis, etc., can solve problems such as low oxygen purity index and difficulty in single-stage membrane separation process
Active Publication Date: 2015-06-10
SHAANXI MOG MEDICAL EQUIP CO LTD
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Problems solved by technology
[0006] However, due to the performance of conventional molecular sieves for oxygen production, CaA, CaX, NaX, LiX and other common zeolite molecular sieves are used to produce molecular sieve pressure swing adsorption based on the equilibrium adsorption mechanism. Oxygen technology can only obtain oxygen with a purity of 80-95.7% from the air. The technical indicators (compulsory terms) for medical oxygen use are also a special case where the industry standard in our country is lower than the national standard.
[0007]Membrane separation technology has opened up a new technical approach for the production of medical oxygen. The process of membrane separation oxygen production is a physical process without phase change. The equipment is intrinsically safe and can meet the Safety requirements for any hospital use, no safety risks such as bottled oxygen, liquid oxygen Dewar bottle transportation, storage, use, etc. At the same time, the membrane separation method also has all the advantages of the PSA method, flexible, convenient, less investment, and low energy consumption , high degree of automation, however, the existing single membrane separation process is limited by the separation performance of the membrane separation material, and it is difficult for the single-stage membrane separation process to reach the oxygen purity ≥ 99.5% stipulated in the "GB8982-2009 Medical and Aviation Respiratory Oxygen" standard technical requirements
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[0032] 1) As attached figure 1The 2-stage multi-cycle membrane separation coupling process, in which the 1st-stage membrane separation process receives the compressed and pre-treated clean compressed air as the feed gas and enters it after the flow is adjusted by the V1 valve, and the 2nd-stage membrane separation process. At least a part of the gas discharged from the retention side of Group 2 is mixed with it through V4 to adjust the flow rate, and then used as raw material gas for the first-stage membrane separation process from ①, and its oxygen partial pressure should be ≥ 100 (KPa);
[0033] In the separation process of this stage, typically, the air is compressed to such as 4-10 atm (gauge pressure) by a compressor, and then passes through a filter such as a well-known technology, including an activated carbon degreaser or filter, a freeze dryer or an adsorption dryer. The pretreatment system composed of compressed air and other components removes the moisture, solid pa...
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The invention belongs to the technical field of medical oxygen and specifically relates to a method for preparing medical oxygen from mixed gases containing oxygen air components through multi-cycle membrane separation. The method includes that firstly, at least one stage of membrane separators is used for separation and mainly used for removing nitrogen; and secondly, at least one stage of multi-cycle membrane separators is used for separation and mainly used for removing argon and nitrogen, wherein at least part of the oxygen produced from a self-infiltrating side is output to be product gases; and the oxygen produced from the self-infiltrating side is circularly returned to a second group of the membrane separators to be used as feed gases. According to the method, the medical oxygen with purity larger than or equal to 99.5% can be obtained, and the medical oxygen meets standard requirements of GB8982-2009 oxygen supplies for medicine and aircraft breathing.
Description
technical field [0001] The invention belongs to the technical field of medical oxygen supply, and in particular relates to a method for preparing medical oxygen from a mixed gas containing oxygen-containing air components. Background technique [0002] At present, the methods of oxygen production and supply for medical purposes mainly include: [0003] 1Using cryogenic air separation technology to produce gaseous oxygen and fill it into steel cylinders or produce liquid oxygen and fill it into a liquid oxygen storage tank and transport it to the hospital site. Among them, the medical oxygen packed in steel cylinders is used for centralized oxygen supply to the hospital , and liquid oxygen is vaporized to provide centralized oxygen supply to the hospital. These two oxygen supply methods are the mainstream oxygen supply methods in hospitals at present. The gas sources are all oxygen produced from the air by cryogenic air separation technology. The physical and chemical perfor...
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IPC IPC(8): B01D61/02
Inventor 陈宗蓬罗二平申广浩谢东红俞晓峰
Owner SHAANXI MOG MEDICAL EQUIP CO LTD