At present zeolite for oxygen plant most use Lithium grade zeolite molecular sieve and Sodium zeolite grade molecular sieve by PSA or VPSA technology.
Molecular sieve is a crucial adsorbent in the technology of pressure swing adsorption air separation oxygen production. Molecules whose molecular diameter is smaller than the sieve pores of zeolite molecular sieves can enter the pores, but they can still use different molecular polarities, unsaturation, and polarization rates，the difference in adsorption strength and diffusion rate caused by spatial configuration and so on separates gas molecules. This is because the zeolite composed of cations and the negatively charged silico-alumina framework is itself a polar substance, which can polarize molecules through electrostatic induction. Therefore, the more polar, or the more easily polarized molecules, the easier it is to be adsorbed.
Zeolite molecular sieve has high adsorption capacity at low adsorbate concentration (or high adsorption temperature). The reason is that its adsorption properties are different from other adsorbents. For example, the adsorption force of activated carbon is a function of dispersion forces, while zeolite molecular sieve not only has a function of dispersion force but also has a large electrostatic force. Since the crystal cavity of the zeolite molecular sieve contains cations, and the stock oxygen is negatively charged, a strong local positive electric field is generated around the cations. Due to the combined effect of the two, zeolite molecular sieves have a particularly strong adsorption capacity.
Pressure swing adsorption (PSA) is a newly emerging gas separation technology in the industry in recent decades. Take the adsorbent molecular sieve as an example. It uses air as raw material and uses a high-efficiency and high-selection solid adsorbent under certain pressure and circulation conditions. According to the difference of adsorption balance and rate behavior and the selective adsorption performance of nitrogen and oxygen, the rapid adsorption- desorption cycle is carried out to achieve the purpose of gas separation and adsorbent recycling.
The main application areas of pressure swing adsorption include the following aspects: air purification, pressure swing adsorption air separation to produce oxygen, pressure swing adsorption air separation to produce nitrogen, pressure swing adsorption to produce hydrogen, use pressure swing adsorption to transform fertilizer plants, recover carbon dioxide from a gas source rich in carbon dioxide.
Among them, the use of pressure swing adsorption to produce oxygen is becoming more and more extensive. It is not limited to a few industries such as metallurgy and chemical industry, but also has a large number of applications in medicine, food, papermaking, environmental protection, aquaculture, home health, and other industries.
The classification of pressure swing adsorption oxygen production has the following three:
VPSA oxygen production (100m³/h-7500m³/h) adsorption pressure about 40kPa desorption pressure about 50kPa.
PSA oxygen production (1m³/h-200m³/h) adsorption pressure about 5kg, atmospheric pressure desorption
Rapid adsorption method (1L/min-20L/min) adsorption pressure about 2kg, atmospheric pressure desorption
Application advantages of pressure swing adsorption
Pressure swing adsorption has a short cycle time, low energy consumption for normal temperature operation, low investment, and easy automatic control.
Its main advantages are reflected in:
1. Low energy consumption, it only consumes a lot of work when air is compressed. Generally, PSA pressure is lower than 0.2-0.6MPa, VPSA is below 0.06MPa, VPSA is below 0.06MPa, and VPSA energy consumption is much lower than PSA. Adsorbent regeneration does not require heating and only requires little work from a small vacuum pump. The power consumption of VPSA oxygen production is less than 0.41KWh/m3, the power consumption of nitrogen production is 0.27-0.31KWh/m3, and the hydrogen production of coke oven gas is 0.5KWh/m3.
2. Good adaptability, the pressure swing adsorption device can be adjusted slightly to change the production capacity, change the impurity content of the raw gas, and the process conditions such as the inlet pressure.
3. The adsorbent has a long service life. Generally, it can be used for more than ten years and can be extended with a little new adsorbent, with less maintenance time and a high operating rate.
4. Can be automated.
5. The equipment can operate at room temperature outdoors, without insulation or heating and cooling. Except for the low-voltage booster meters, there is no consumption of steam, water, or electricity. Pressure swing adsorption is of great significance for reducing industrial investment and energy consumption.
Medical granular oxygen sieve JLOX-100 series molecular sieve and JLOX-500 series molecular sieve produced by Jianlong Company has outstanding performance in the field of pressure swing adsorption.
JLOX-500 series high-efficiency molecular sieve for oxygen generation is a new type of X-type molecular sieve, which is mainly used in the pressure swing adsorption oxygen generation process with pressure adsorption and atmospheric desorption. It has a high nitrogen adsorption capacity and excellent nitrogen and oxygen separation coefficient.
JLOX-500 series high-efficiency oxygen generation molecular sieves are mainly used in pressure swing adsorption oxygen generation devices. It has the advantages of high oxygen purity, high oxygen production rate, fast adsorption rate, and long service life. It is the best substitute for the 5A (Ca A) oxygen molecular sieve. JLOX-500 products are mainly used in PSA industrial oxygen production and medical center oxygen supply systems. The JLOX-501 product is a molecular sieve dedicated to PSA medical (household) oxygen generators and micro oxygen generators.
The JLOX-100 series of high-efficiency oxygen production molecular sieve is a lithium X-type aluminosilicate crystal, which is an oxygen production molecular sieve with an international advanced level. Widely used in steel, non-ferrous metallurgy, chemical industry, furnace energy-saving transformation, environmental protection, papermaking, aquaculture, medical care, and other industries.
The JLOX-100 series of high-efficiency oxygen molecular sieve is mainly used in pressure swing adsorption oxygen generation devices. It has the characteristics of large adsorption capacity, high separation coefficient of nitrogen and oxygen, and easy desorption. Its nitrogen adsorption capacity is about twice that of A-type oxygen molecular sieve. At the same time, JLOX-100 series oxygen-rich molecular sieve has good wear resistance and long service life. Therefore, the use of JLOX-100 series oxygen-enriched molecular sieve to produce oxygen can significantly reduce the energy consumption of oxygen production and the operating cost of the device
, Improve economic efficiency. The JLOX-101 product is a high-efficiency oxygen molecular sieve used in high-end small medical (home) oxygen generators.
The Chinese research and production company JALON specializes in the research, manufacture, sales and service of various molecular sieves.
JALON provides product categories based on four existing technologies: molecular sieve, zeolite powder, activated zeolite powder and activated alumina.
The company’s main business area is the development and production of molecular sieve products suitable for modern high-tech gas separation systems.
JALON’s products and projects are distributed in the United States, Germany, France, South Korea, Japan and many countries in the world. JALON has a complete customer network. Leading companies engaged in oil and gas production, machinery manufacturing, food industry, coal, chemical, petrochemical and other industries use JALON services.
Further information at jalonzeolite.com.
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