Characterization of Physicochemical Properties of Deactivated Particulate Clay Used in Aromatic Hydrocarbon Refining and Its Regeneration
SUN Xu-jiang~(1,2),CHEN Ji-xiang~(1),ZHANG Li-qun~2,ZHANG Ji-yan~1,WANG Shi-chang~1(1.School of Chemical Engineering,Tianjin University,Tianjin 300072,China;2.Research Institute of Tianjin Petrochemical Corporation,Tianjin 300271,China)
(1,2),CHEN Ji-xiang~(1),ZHANG Li-qun~2,ZHANG Ji-yan~1,WANG Shi-chang~1(1.School of Chemical Engineering,Tianjin University,Tianjin 300072,China;2.Research Institute of Tianjin Petrochemical Corporation,Tianjin 300271,China
Abstract��
Particulate clay is commonly applied in the refining of aromatic hydrocarbon,and it will deactivate after a period of use.In this study,deactivated particulate clay was characterized by means of BET,TG,TPO,UV-Vis,XRD,and NH_3-TPD,and the mechanisms of deactivation were analysed.Because it was of acidic,the particulate clay catalysed olefins to polymerize each other or alkylate with aromatic hydrocarbon,and larger molecules formed.When these larger molecules were not removed by aromatic hydrocarbon fluid,they would overlay the surface of particle clay,and occupy the pores of particle clay.Thus,the number of acidic sites as Well as the specific surface of particle clay decreased,and the particulate clay deactivated gradually.Owing to lower reaction temperature in the aromatic hydrocarbon refining,the phase of particulate clay did not change after deactivation,and so the phase had no relation with the deactivation of particulate clay.By the oxidation with air under the proper temperature,the deactivated particle clay restored its specific surface area,pore volume,and activity to a great extent.
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2006, Vol. 23 
