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Hydroisomerization of C_(?)-aromatics on bifunctional catalysts is a main approach to commercial produc- tion of paraxylene.In the present paper,the selectivity kinetics of hydroisomerization of C_(?)-aromatics on a Pt/zeolite catalyst has been investigated at 330℃,886 kPa,and H_2/hydrocarbon ratio(mole)of 10,similar to industrial operating conditions.The apparent chemical scheme,in which C_(?)-cycloparafflns in the reaction sys- tem is regarded as a lumped species,is proposed,and the kinetic model of Hougen-Watson type is used for the pseudomonomolecular system.The relative rate constants are determined by the Wei-Prater method.The results can explain the reaction mechanism reported in the literature and fit the experimental data.Expressions for purging composition data and row vectors of modal matrix,which are helpful in simplifying calculation, are derived.
Hydroisomerization of C _ (?) - aromatics on bifunctional catalysts is a main approach to commercial productions of paraxylene. In the present paper, the selectivity kinetics of hydroisomerization of C _ (?) - aromatics on a Pt / zeolite catalyst has been investigated at 330 ° C, 886 kPa, and H 2 / hydrocarbon ratio (mole) of 10, similar to industrial operating conditions. The apparent chemical scheme, where C _ (?) - cycloparaffins in the reaction sys- tem is regarded as a lumped species, is proposed, and the kinetic model of Hougen-Watson type is used for the pseudomonomolecular system. The relative rate constants are determined by the Wei-Prater method. The results can explain the reaction mechanism reported in the literature and fit the experimental data. Expressions for purging composition data and row vectors of modal matrix, which are helpful in simplifying calculation, are derived.