Assessment of Naphthalene Absorption Efficiency from Coke Oven Gas

The quality and quantity of coke oven gas depend on the properties of charged coal blend and cokemaking technology. In general, the raw coke oven contains naphthalene vapor in the range of 1500–2000 g per 100 Nm 3 of gas which starts condensing directly into the solid form if the temperature of the gas goes down. Therefore, removal of naphthalene from coke oven gas is vital for ease of transporting through pipelines and its use as fuel. The removal process consists of scrubbing system followed by a stripping system. The scrubbing system requires efficient wash oil for absorbing the naphthalene, and the rich wash oil needs to be stripped for recycling the wash oil in the scrubbing system. In the present study, four different sources of wash oils were chosen for detailed characterization followed by aspen simulation. The stripping of naphthalene from rich wash oils shows that the HWO has better efficiency, followed by CTWO. The SWO and IWO are also having satisfactory performance. The SWO contains less sulfur and specific gravity compared to CTWO, HWO and IOWO. The characterization temperature of SWO at 5% distilled is very high (347.5°C) as compared to IOWO (330.6°C), HWO (280.3°C), and CTWO (252.1°C). Also, the temperature at 95% distilled is 373.3°C is low compared to other tested oils. The result shows that properties of SWO oil are superior for absorbing naphthalene.