| dc.description.abstract | The industry prospers as the economy thrives. The emission of industrial waste gases has been a growing concern. Nitrous oxide (N2O), also known as ‘laughing gas’, is not only a kind of greenhouse gas, but also one of the waste gases emitted from chemical plants. When there are waste-gas spills above the ground, it is necessary for professional personnel to handle it on site instantly. Therefore, to ensure their safety, setting a portable, pollutant-capturing device in car will be a suitable way. Apart from capturing air pollutants, this device will also provide clean air to passengers.
Pressure Swing Adsorption (PSA) is a process to separate gas mixtures. Based on adsorption capability, selectivity, and the property that adsorbent adsorbs at high pressure and desorbs at low pressure, we can achieve the goal of separating gas mixtures.
In the simulation, a dual-bed eight-step PSA process is studied. The adsorbent is commercialized 5A zeolite. The feed composition is 10% N2O, 71.1% N2 and 18.9% O2. The oxygen concentration in the effluent gas should be slightly higher than air, with the concentration of nitrous oxide being less than 50 ppm. The recovery of concentrated nitrous oxide should be as high as nearly 100%. The optimal operating condition can be obtained by assessing different operating variables such as bed length, feed pressure, vacuum pressure, and the time of each step.
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