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Separation Technologies of Aromatic Hydrocarbons

Xu Jie Zhu Yuming (Fushun Research Institute of Petroleum & Petrochemical, Fushun 113004; Dandong Subsidiary of Oil Pipeline Transportation Company, Dandong 118007)  
The main methods to separate aromatic hydrocarbons such as benzene were reviewed comprising solvent extraction and adsorption stripping. Solvent extraction included Udex, Sulfolane, Arosolvan, IFP and Formex methods . The processes, operating conditions, the yield of aromatic hydrocarbon and consumption index were introduced. The solvents for extraction were compared with the order of comprehensive behavior as follows: tetramethylene sulfox-ide N - formyl morpholine, tetraglycolether, in which N - formyl morpholine used as solvent for extraction would be a new trend. Adsorption stripping introduced was Parex process developed by UOP which included model movable bed adsorption - separation appratus, barium or potassium cation exchanged X or Y zeolite as absorbent, toluene, mixture of diethyl benzenes,para - diethyl benzene and 1,2,3 ,4 - tetrahydronaphthalene as desorption agents.
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