Abstract
Hydrogen recovery from off-gas of hydrocracking unit by adsorption is one of the process that could increase the efficiency processes of refinery unit. The purpose of this research is to make coffee grounds based activated carbon bioadsorbent that will be used in hydrogen recovery proses. The carbon was prepared by chemical activation using ZnCl2 at temperature 600°C. The surface area of produced activated carbon was measured using BET and Iodine number, while its surface morphology and composition were characterized using SEM-EDX. The adsorption capacity of activated carbon and its selectivity will be tested using hydrogen-methane gas mixture. The test was carried out on pure methane and hydrogen gas at 20°C and a mixture of CH4/H2 (mole ratio: 4:1) at 10°C, 20°C and 30°C and pressures from 1 to 6 bars. The results of this study show that the activated carbon can be successfully produced having the specific surface area of 728.07 m2/g and the iodine number of 2160 mg/g. The result shows that the adsorption of pure CH4 gas at the same pressure was 2.4 times greater than pure H2. The adsorption test indicates that the produced activated carbon might be used for hydrogen/methane separation.
Highlights
Hydrogen is one of the main intermediate products largely utilized in oil and petrochemical industries
The results of this study show that the activated carbon can be successfully produced having the specific surface area of 728.07 m2/g and the iodine number of 2160 mg/g
The performance of produced activated carbon is tested on the adsorption of pure hydrogen, pure methane, and gas mixture at 20oC, and it is tested to a gas mixture of methane and hydrogen in isothermal condition at 10oC, 20oC, and 30oC with the pressures range of 1 – 6 bars
Summary
Hydrogen is one of the main intermediate products largely utilized in oil and petrochemical industries. Its usage has been constantly growing in modern refineries, chemical, and petrochemical complexes in order to treat heavier oil feedstock [1]. In refineries or petrochemical complexes, the off-gas streams contain a considerable amount of hydrogen, which are mostly incinerated in refinery flares as a waste gas [2]. The utilization of hydrogen from off-gas can increase process efficiency and reduce production costs. The off-gas produced in refinery unit consists of carbon dioxide, hydrogen, methane, and ethane. Adsorption would be the most suitable technology due to its ability to release either CH4 or CO2 and requires lower energy compared to other technologies [3]
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