Desulfurization of Petroleum Coke by Calcination in Ammonia Atmosphere below 1000℃

• 机 构: School of Metallurgy and Environment, Central South University
• 出 处: null
• 发表日期: 2016年04期
• 基金项目: financially supported by the National Natural Science Foundation of China（Projects No.51374253 and No.51574289）；

The desulfurization efficiency and mechanism of the calcination of petroleum coke in ammonia atmosphere at lower than 1000 ℃ were investigated through a series of conditional experiments and comparison with other gases such as H2. The topics of efficiency and reaction mechanism are usually discussed through investigation by means of the Fourier transform infrared spectroscopy（FT-IR）, the Brunauer-Emmett-Teller（BET） technique, and the thermogravimetry coupled with the mass spectrometry（TG-MS）. Results showed that in addition to H2, ammonia not only could retain a high desulfurization rate but could also reduce coke loss during the desulfurization process of petroleum coke. The best desulfurization conditions covered a petroleum coke particle size of less than 0.1 mm, a calcination temperature of 800 ℃ in ammonia atmosphere with a flow rate of 10 L/h, and a heating duration of more than 120 min. Ammonia decomposition, H2 generation, decline in the activation energy of the carbon–sulfur bonds, and petroleum coke with a largest specific surface area at 800 ℃ are the key goals of desulfurization studied thereby. As proved by TG-MS analysis, given a large quantity of H2, ammonia can be decomposed at the same temperature to completely come into contact with the sulfur species in petroleum coke to generate H2S.