Study on removing thiophene-like sulfides from coking benzene

It is very important to remove thiophene-like sulfides from coking benzene for its further processing and utilization.According to the differences of physical and chemical properties between benzene and thiophene,there are many available desulfurization methods,such as sulfuric acid refining,catalytic hydrogenation,extractive rectification,freeze-crystallization,selective adsorption and so on.In this paper these methods are analyzed and compared.After comparison it is pointed out that sulfuric acid refining can bring out equipment corrosion and environmental pollution,catalytic hydrogenation consumes hydrogen and has higher operating costs,extractive rectification method consumes large amount of energy and has poor desulfurization effect,freeze-crystallization method easily forms mixed crystals.In contrast,selective adsorption removing sulfur (SARS) is a greatly potential method with the advantages of smaller equipment corrosion,less environmental pollution,lower operating costs,recovery ability of thiophene and no consumption of hydrogen.