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CHAPTER 3 EXPERIMENTAL SECTION 3.1 ADSORPTION ISOTHERM MEASUREMENT Pure component adsorption equilibrium isotherms for CO2 and N2, on zeolite 13X were measured by using a volumetric system from micromeritics ASAP2010. Since ASAP- 2010 is designed for surface area and porosimetry measurements and measures the nitrogen isotherm at 77 K it had to be modified to be able to measure different pure gas isotherms at various temperatures. Operation pressure range provided by this system is from 0 to 127 KPa. The molecular drag pump can create vacuums down to 1.3 *10-6 KPa in the system. The volumetric method involves measuring the pressure change in a known volume of sample gas exposed to an adsorbent sample. As the gas is adsorbed and allowed to come to equilibrium with the adsorbent, the measured decrease of pressure in the closed system indicates the amount of gas adsorbed under the given isothermal conditions. Data was collected for the equilibrium pressure range of 0.001 to 110 KPa at 25, 50 and 75 degree Celsius. Obtaining each complete isotherm consists of 60 to 120 equilibrium point measurements and takes roughly about 12 hours. For each point when the rate of change for pressure is less than 0.01% criterion for equilibrium is satisfied and the system moves to the next point. Prior to each isotherm measurement, the zeolite 13X was regenerated at 350 °C for 16 hours under a vacuum of less than 1 x 10-4 torr. In order to prevent structural damage caused by desorbing water steam. A stepwise increase in temperature with simultaneous 11PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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