Keywords : mass transfer, chemical reaction, absorbent, Fe-EDTA, packed column
By : Endang Kwartiningsih dan Arif Jumari
Abstract : Gas purification from the content of H2S using Fe-EDTA (Iron Chelated Solution) gave several advantages. The advantages were the absorbent solution can be regenerated that means a cheap operation cost, the separated sulfur was a solid that is easy to handle and is save to be disposal to environment.This research was done by simulation and experimental. The experimental research was done to valid the simulation result. By comparing the experiment and simulation result, the mass transfer coefficient and the reaction rate constant was found. Then the kinetics value was fundamental data that used to design H2S absorption column by Fe-EDTA absorbent in pilot plant or in industry scale. The simulation step was done by mathematical model arrangement representing the absorption process in packed column through mass transfer arrangement such as mass transfer equations and chemical reaction. The best online casino experimental step was done with the making of Fe-EDTA solution from FeCl2 and EDTA. Then Fe-EDTA solution was flown in counter current packed column that was contacted with H2S in the methane gas. By comparing gas composition result of experiment and simulation, the value of mass transfer coefficient in gas phase ( kAga), mass transfer coefficient in liquid phase (kAla) and the reaction rate constant ( k) were found. The values of mass transfer coefficient in liquid phase (kAla) were lower than values of mass transfer coefficient in gas phase (kAga) and the reaction rate constant (k). It meant that H2S absorption process using Fe-EDTA absorbent solution was determined by mass transfer process in liquid phase. The higher flow rate of absorbent, the higher value of mass transfer coefficient in liquid phase. From analysis of dimension and data processing, the relation of dimensionless number between Sherwood number and Reynolds number was :
