1、 Membrane separation method uses the permeability selectivity of some organic polymeric membranes. When air passes through the membrane (0.1um) or hollow fiber membrane, the speed of oxygen passing through the membrane is about 4-6 times that of nitrogen, so as to realize the separation of oxygen and nitrogen.

这种方法装置简单，操作方便，启动快，投资少。但它的氧浓度比较低，一般在28%-35%，所以它一般应用在氧气纯度不算高的地方。

This method has the advantages of simple device, convenient operation, fast start-up and less investment. However, its oxygen concentration is relatively low, generally 28% - 35%, so it is generally used where the oxygen purity is not high.

二、电解法采用的原理是在稀的硫酸、氢氧化钠或硫酸钠的水溶液中通直流电，使水电离。每制取1m3氧气，同时获得2m3氢气。但由于制取1m3氧气耗电量为12-15度耗电量太大，这种方法也不能大量生产。

2、 The principle of electrolysis method is to apply direct current in dilute sulfuric acid, sodium hydroxide or sodium sulfate aqueous solution to ionize water. Every 1m3 of oxygen is produced and 2m3 of hydrogen is obtained at the same time. However, because the power consumption for preparing 1m3 oxygen is 12-15 degrees, the power consumption is too large, and this method can not be produced in large quantities.

三、变压吸附法分子筛式制氧机是一种气体分离。物理方法(PSA法)直接从空气中提取氧气，即制即用，新鲜自然。在制氧机中装填有分子筛，每克分子筛的表面积能达到800-1000m2/g，在加压的情况下，利用分子筛的物理吸附和解吸，吸附空气中的氮气，未被吸附的氧气则会被收集起来，通过对其进行净化处理，就能够得到纯度比较高的氧气。分子筛制氧机是目前成熟的，具有标准和标准的制氧机，可实现周期性的循环制氧，是一个动态的过程不存在高压易爆等危险。

3、 Pressure swing adsorption molecular sieve oxygen generator is a kind of gas separation. Physical method (PSA method) directly extracts oxygen from the air, which is ready to use, fresh and natural. The oxygen generator is filled with molecular sieve, and the surface area of each gram of molecular sieve can reach 800-1000m2 / g. under pressure, nitrogen in the air is adsorbed by physical adsorption and desorption of molecular sieve, and the non adsorbed oxygen will be collected. Through purification treatment, oxygen with high purity can be obtained. Molecular sieve oxygen generator is mature at present. It has standard and standard oxygen generator, which can realize periodic circulating oxygen production. It is a dynamic process without high-pressure explosion and other risks.