Nitrous oxide N2 O. At atmospheric pressure, its boiling point is higher than that of N2, O2 and Ar.
Under the conditions of pressure and temperature in small air separation equipment, it will concentrate in liquid oxygen during the separation of oxygen and nitrogen. The solubility of N2O in water is very small, N2O with the process air through the air filter, compressor, cooler, water separator can not be separated and removed, most of the N2O will be brought into the molecular sieve purifier, the molecular sieve adsorption capacity of N2O is less than the adsorption capacity of CO2, N2O first penetrate the adsorption bed and enter the distillation tower, and in the molecular sieve on H2O, CO2, C2H2 and other In the main heat exchanger, the process air is cooled to near liquefaction temperature and the N2O condenses to a solid first, which can cause air passage blockage. In the distillation tower, because N2O is a high boiling point component compared to N2, O2 and Ar components, it will be dissolved in the liquid oxygen, resulting in high purity liquid oxygen and gas oxygen products cannot be obtained at the bottom of the upper tower, when the liquid oxygen is not discharged sufficiently, N2O accumulates in the liquid oxygen, and when the N2O content in the liquid oxygen is too large, it will precipitate as a solid and block the main condensing evaporator channel.
DEAR Air manufactures small air separation units, large air separation units and liquid air separation plants according to market demand the purity of the oxygen product is becoming more and more demanding and therefore the removal of N2O from the process air is more important. Finding the right molecular sieve to remove the H2O, CO2, C2H2 and N2O from the process air by adsorption in the molecular sieve purifier.
