HYDROGEN SEPARATION FROM MIXED GAS (H2, N2, CO, CO2) USING Pd82Ag18/Al2O3 MEMBRANE IN STEADY STATE AND FORCED UNSTEADY STATE OPERATION

• Main Author: KRISTIAN IRAWAN (NIM: 23016041), HANS
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22364
• Institution: Institut Teknologi Bandung

hydrogen separation unit are needed to produce high purity hydrogen. Process <br /> <br /> <br /> intensification offers a new method by combining those units into single <br /> <br /> <br /> palladium-based reactor membrane. <br /> <br /> <br /> The purpose of this research is to investigate the effects of several co-existing gas <br /> <br /> <br /> (N2, CO, CO2) to Pd82Ag18/Al2O3 membrane (thickness: 20,2&#956;m) in steady state <br /> <br /> <br /> operation and also to investigate the effects of switching time to membrane <br /> <br /> <br /> performance in forced unsteady state operation through simulation. The operating <br /> <br /> <br /> condition during this research are 350°C, atmospheric pressure, and the <br /> <br /> <br /> membrane operating time is ±8 hours. Membrane performances is measured by <br /> <br /> <br /> hydrogen recovery and hydrogen flux. <br /> <br /> <br /> The results shows that there is no membrane deactivation caused by N2 and CO2 <br /> <br /> <br /> during the operating time; but membrane deactivation occurs due to CO. The <br /> <br /> <br /> sequence of co-existing gases that affect the hydrogen flux is CO>CO2>N2. The <br /> <br /> <br /> greater the fraction of co-existing of gases in the feed will cause dilution, <br /> <br /> <br /> concentration polarization, and/or inhibition on the membrane surface that <br /> <br /> <br /> decreasing the performance of the membrane. In the forced unsteady state <br /> <br /> <br /> operation, switching time (ST) 2 seconds gives sliding regime; ST 12 seconds <br /> <br /> <br /> gives a dynamic regime; and ST 120 seconds gives steady state quasy regime. <br /> <br /> <br /> From simulation, it can be concluded that 120 second switching time provides an <br /> <br /> <br /> opportunity to gain higher hydrogen recovery compared to steady state operation. <br /> <br /> <br /> It also gives opportunity to decrease time-lag during the start-up period.