Desulfurization of Petroleum Coke via Alkali Calcination

Abstract

Alkali desulfurization of petroleum coke is an important technology, can improve the performance of the final products of petroleum coke, while reducing air pollution. This paper studied the conditions for desulfurization of calcined petroleum coke using NaOH solid powders. The experimental results show that, the grain size in the range of experiment did not seem to influence desulphurization. With the increase of temperature, adding alkali coke ratio, reaction time, desulfurization of petroleum coke rate increased. In the alkali coke ratio of 2, the reaction temperature is 500°C, the reaction time is 2 h, the desulfurization of petroleum coke ratio reached 98.1%. Desulfurization of petroleum coke rate by prolonging the reaction time, to a certain extent, maintains the same level of lowing alkali coke ratio.

Deep Desulfurization of High-Sulfur Petroleum Coke via Alkali Catalytic Roasting Combined with Ultrasonic Oxidation

“…Wang et al [ 38 ] found that the desulfurization effect of petroleum coke has little correlation with the particle size of petroleum coke. However, Pintowantoro et al [ 43 ] found that, as the particle size of petroleum coke decreased, the desulfurization effect increased, and a particle size of 100 mesh was sufficient to destroy the chemical bonds of sulfur compounds in petroleum coke.…”

“…Alkali metal compounds such as potassium hydroxide (KOH) and sodium hydroxide (NaOH) react with organic sulfur, sulfur salts, and sulfur-containing gases in petroleum coke at higher temperatures to effectively remove sulfur from petroleum coke [ 37 ]. Wang et al [ 38 ] utilized NaOH to study the desulfurization performance of petroleum. The experiment, conducted under inert atmospheric conditions, involved an initial sulfur mass fraction of 6.50%, an alkali-to-petroleum-coke ratio of 50%, a temperature of 500 °C, and a reaction time of 2 h. The results indicated a 98.1% desulfurization rate of petroleum coke.…”

In-situ Formation of Sulphur-Trapped Petroleum Coke via Thermal Cracking of Vacuum Residue: A Practical Approach to Reduce Environmental Pollution

“…Desulphurisation of petroleum coke via calcination in the presence of an excess amount of alkali is known to reduce the sulphur content of petroleum coke substantially [11,12]. In a recent development, researchers found that with an alkali-to-coke ratio of 2, a reaction temperature of 500 °C, and a reaction time of 2 h, the desulphurisation of petroleum coke reached 98% when NaOH powder was used as an alkali source [13]. Although the alkali calcination technique reduces sulphur content in petroleum coke to a large extent, the method is not economically viable due to the stoichiometric use of caustic.…”