Abstract
Sulfur compounds are one of the most concerning pollutants in the petroleum industry. As a potential energy resource with high sulfur content, oily sludge has received increasing attention, yet little effort has been made to characterize the behavior of sulfur compounds during utilization. In this paper, sulfur compounds in the raw oily sludge collected from a crude oil tank were identified, and influences of temperature and potassium compounds (KCl and KOH) on the transformation behavior of sulfur were investigated during the pyrolysis. Sulfur species retained in the solid residues were analyzed by X-ray photoelectron spectroscopy. Possible sulfur-participating reactions during pyrolysis were discussed. Results showed that inorganic sulfur was mainly presented in the form of sulfate in solid particles, and organic sulfur was presented in the oil phase. During pyrolysis, H2S was released due to the decomposition of aliphatic and aromatic sulfurs. The emission of H2S can be promoted by 100% from 350 to 450...
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