CHEMICAL DESULFURIZATION OF COAL WITH SODIUM HYPOCHLORITE

• Main Author: Iqbal Hasbullah (NIM 230 03 007), Moch.
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8625
• Institution: Institut Teknologi Bandung

Abstract : <br /> <br /> <br /> Besides regenerating energy, the combustion process of coal releases SOx gas emission which results in environmental concerns such as acid rain, corrosion at boiler equipment, global warming, etc. Chemical desulfurization process is an effort for sulfur removal contained in the coal matrix. It is expected that the reduced sulfur content will minimize the negative impact of SOX emission. <br /> <br /> <br /> The objective of this study are to explore a proper desulfurization method and to determine the effect of sodium hypochlorite concentration, pH and temperature, on the desulfurization. <br /> <br /> <br /> This study utilizes TBLR and LBB. TBLR was bituminous high volatile A that has a sulfur of pyrit and organic content of 2.06 %,adb, and 3.04 %. LBB was bituminous lignit A that has a sulfur of pyrit and organic content of 4.60 %, adb, and 3.42 %, adb. <br /> <br /> <br /> A (2;,i) half fractional factorial design was used for experimental design. TBLR coal was desulfurization in one step only. The reaction time was 2 hours. The concentration of sodium hypochlorite was 0.2 M and 0.6 M. The pH value was 12 and 13.5. The operating temperature was 50 C and 90 C. The desulfurization LBB coal was conducted in three consecutive steps, pretreatment, desulfurization and hydrolysis. The reaction time was 1 hour. The concentration of sodium hypochlorite was 0.2 M and 0.8 M. The pH value was 12 and 13,5. The operating temperature was 28 C (room temperature) and 40 C. <br /> <br /> <br /> The desulfurization method of TBLR coal could reduce of total sulfur 65.19 %, pyrite sulfur 43.69 %, sulfate sulfur 67.21% and organic sulfur 78.94 %, at the condition of 0.2 M sodium hypochlorite, 50 C, and pH 13.5. The desulfurization method of LBB coal capable of reducing significant amount of total sulfur 51.79 %, pyrite sulfur 9.35 %, sulfate sulfur 67.48 % and organic sulfur 99.41 %, at the condition 0.2 M sodium hypochlorite, 28 C and pH 13.5. The pH value was the most significant factor. <br />