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With air as the raw material, l the use of physical method, in which separation of oxygen and nitrogen obtained.

There are three kinds of industries, namely, cryogenic air separation method, molecular sieve air separation method (PSA) and membrane air separation method.

A cryogenic air separation nitrogen generator

Cryogenic Air Separation Nitrogen Nitrogen is a traditional method, has several decades of history. It is based on the air as raw material, through compression, purification, re-use of heat exchange liquid into the air Air Liquide. Air Liquide is mainly a mixture of liquid oxygen and liquid nitrogen, using liquid oxygen and liquid nitrogen boiling point of different (in an atmospheric pressure, the former boiling point of -183 ℃, the latter for the -196 ℃), by Air Liquide of Rectification to enable them to obtain the separation of nitrogen. Cryogenic air separation nitrogen plant complex covers an area of large, expensive infrastructure, equipment, large one-time investment, running costs are higher, slower gas production (12 ~ 24h), installation of demanding a longer period. Integrated equipment, installation and infrastructure factors, 3500Nm3 / h below the equipment, the same specifications than the investment scale PSA installations of cryogenic air separation plant by 20% ~ 50%. Nitrogen cryogenic air separation unit appropriate for large-scale industrial nitrogen, while the small-scale nitrogen becomes uneconomical.

B molecular sieve air separation nitrogen

Take air as raw materials and carbon molecular sieve as the adsorbent, using pressure swing adsorption principle, the use of carbon molecular sieve for the selective adsorption of oxygen and nitrogen Ershi nitrogen and oxygen separation method, known as PSA nitrogen. This method is developed rapidly in the seventies, a new nitrogen technology. Compared with the traditional nitrogen, it has a simple process, high degree of automation, gas fast (15 ~ 30 minutes), low energy consumption, the product purity in a wide range be adjusted according to user needs, operation and maintenance easy, run lower cost, installation adaptability and other characteristics, so in the 1000Nm3 / h under nitrogen equipment quite competitive, more and more to be small and medium nitrogen users welcome, PSA Nitrogen has become a small nitrogen user's preferred method.

C Membrane Air Separation Nitrogen

With air as raw materials in certain pressure conditions, the use of different nature such as oxygen and nitrogen gas in the membrane has a different penetration rate to make the separation of oxygen and nitrogen. Compared to other nitrogen plant it has a structure simpler and smaller, non-switching valves, to maintain the amount of less gas faster (≤ 3 minutes), compatibilization convenience, etc., it is particularly suitable for the purity nitrogen ≤ 98% of small and medium nitrogen users, have the best features price. The nitrogen purity of more than 98%, it is with the same specifications of PSA nitrogen plant compared to the price higher than 15%.

Process Overview

Currently in nitrogen, oxygen is used frequently in the field of carbon molecular sieve and zeolite molecular sieves. Molecular sieves for the separation of the role of oxygen and nitrogen is mainly based on these two gases in the surface diffusion rate of different zeolites, carbon molecular sieve is a kind of certain characteristics of both activated carbon and molecular sieve carbon-based adsorbent. Microporous carbon molecular sieve with a small composition, pore size distribution between the 0.3nm ~ 1nm. The smaller diameter of the gas (oxygen) the proliferation of faster, more into the zeolite phase, so that gas can be nitrogen on the enrichment component. After a period of time, molecular sieve adsorption of oxygen balance, according to the different pressures of carbon molecular sieve adsorption of gas adsorption on the different characteristics, reducing pressure to lift the carbon molecular sieve adsorption of oxygen, this process is called regeneration. Pressure swing adsorption towers typically use two parallel, alternating compression and decompression adsorption regeneration, and thus obtain a continuous flow of nitrogen.

Scope

Take air as raw materials and carbon molecular sieve as the adsorbent, using pressure swing adsorption principle, the use of carbon molecular sieve for the selective adsorption of oxygen and nitrogen Ershi nitrogen and oxygen separation method, known as PSA nitrogen. This method is developed rapidly in the seventies, a new nitrogen technology. Compared with the traditional nitrogen, it has a simple process, high degree of automation, gas fast (15 ~ 30 minutes), low energy consumption, the product purity in a wide range be adjusted according to user needs, operation and maintenance easy, run lower cost, installation adaptability and other characteristics, so in the 1000Nm3 / h under nitrogen equipment quite competitive, more and more to be small and medium nitrogen users welcome, PSA Nitrogen has become a small nitrogen user's preferred method.