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, Hans
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/33427
• Institution: Institut Teknologi Bandung

ABSTRACT HYDROGEN SEPARATION FROM MIXED GAS (H2, N2, CO, CO2) USING Pd82Ag18/Al2O3 MEMBRANE IN STEADY STATE AND FORCED UNSTEADY STATE OPERATION By Hans Kristian Irawan 23016041 (Master Program in Chemical Engineering) Hydrogen is one of our future energy sources. Water gas shift reactor and hydrogen separation unit are needed to produce high purity hydrogen. Process intensification offers a new method by combining those units into single palladium-based reactor membrane. The purpose of this research is to investigate the effects of several co-existing gas (N2, CO, CO2) to Pd82Ag18/Al2O3 membrane (thickness: 20,2 ?m) in steady state operation and also to investigate the effects of switching time to membrane performance in forced unsteady state operation through simulation. The operating condition during this research are 350°C, atmospheric pressure, and the membrane operating time is ±8 hours. Membrane performances are measured by hydrogen recovery and hydrogen flux. The results shows that there is no membrane deactivation caused by N2 and CO2 during the operating time; but membrane deactivation occurs due to CO. The sequences of co-existing gases that affect the hydrogen flux are CO>CO2>N2. The greater the fraction of co-existing of gases in the feed will cause dilution, concentration polarization, and/or inhibition on the membrane surface that decreasing the performance of the membrane. In the forced unsteady state operation, switching time (ST) 2 seconds gives sliding regime; ST 12 seconds gives a dynamic regime; and ST 120 seconds gives quasy steady state regime. From simulation, it can be concluded that 120 second switching time provides an opportunity to gain higher hydrogen recovery compared to steady state operation. It also gives opportunity to decrease time-lag during the start-up period. Keywords: Pd-Ag membrane, steady state operation, CO, CO2, N2, forced unsteady state operation