STUDY ON THE ADSORPTION EQUILIBRIUM PARAMETERS AND MASS TRANSFER COEFFICIENTS OF C8 AROMATIC ISOMERS ON ZEOLITE X

Abstract

Abstract: The saturated adsorption capacities and equilibrium constants of C8 aromatic isomers were determined through static adsorption method at 177 ℃ and 0.8 MPa, using barium exchanged X zeolite as adsorbent. The breakthrough curve of individual C8 aromatic isomer was obtained by pulse experiments. The lumped mass transfer coefficients of C8 aromatics were calculated through curve fitting by Aspen Plus software. Simulating experiments were carried out to separate p-xylene, o-xylene, m-xylene and ethylbenzene for validation. Results showed that the simulated curves of all these components were in well accordance with the data from experiments.

Key words: xylene, separation, adsorption equilibrium, mass transfer coefficient, simulation

References

[1]. John Swift. Hydrocarbon ASIA，1998，5(4)：42
[2]. 赵毓璋，景振华. 吸附分离对二甲苯技术进展[J].炼油技术与工程，2003,33(5)：1-5
[3]. Roeback，Donald H．Separation of ethylbenzene with an adsorbent comprising Sr and K exchanged X or Y zeolite：US，4079094[P]. 1978-03-14
[4]. Newuzil R W. Process for the separation of ethylbenzene：US,4497972[P]．1985-02-05
[5]. Ash G，Barth K，Hotier G，etc. Eluxyl: A New Paraxylene Separation Process[J]. Rev Inst Fr Pet，1994，49(5)：541-549
[6]. Minceva M，Rodrigues A E. Modeling and Simulation of a Simulated Moving Bed for the Separation of p-Xylene[J]. Ind Eng Chem Res，2002，41：3454-3461
[7]. Neuzil R W. Aromatic hydrocarbon separation by adsorption：US，3663638[P]. 1972-08-22
[8]. Rosback D H. Adsorptive separation of aromatic isomers with adsorbent：US，4283587[P]，1981-08-11
[9]. 王辉国，郁灼，赵毓璋，等. 对二甲苯吸附剂及制备方法：中国，CN03147981.2[P]. 2003-06-30
[10]. Bouvier L，Kieger S，Laroche C. Aggregate Zeolitic Absorbents,Their Method of Preparation and Their Uses：US，12808072[P]：2008-12-16
[11]. Minceva M，Rodrigues A E. Adsorption of xylenes on faujasite-type zeolite: equilibrium and kinetics in batch adsorber[J]. Chem Eng Res Des，2004，82(5)：667-681
[12]. Song L，Sun Z，Duan L，etc. Adsorption and diffusion properties of hydrocarbons in zeolites[J]. Micropor Mesopor Mater，2007，104(1-3)：115-128
[13]. Tournier H，Barreau A，Tavitian B，Le Roux D. Adsorption Equilibrium of Xylene Isomers and p-Diethylbenzene on a Prehydrated BaX Zeolite[J]. Ind Eng Chem Res，2001，40:5983-5990
[14]. Bellat J，Simonot-Grange M. Adsorption of gaseous p-xylene and m-xylene on NaY,KY,and BaY zeolites. Part 2: Modeling. Enthalpies and entropies of adsorption[J]. Zeolites，1995,15（3）：219-227
[15]. Santacesaria E，Morbidelli M，Servida A，etc. Separtion of Xylenes on Y Zeolite. 2. Breakthrough Curves and Their Interpretation[J]. Ind Eng Chem Process Des Dev，1982，21(3)：446-450
[16]. 张维冰，李瑞江，许国旺，等. 色谱柱分离过程弛豫理论——流出曲线的动力学本质[J]. 分析科学学报，1999,15(3)：199-203
[17]. Zhu N，Liu Y，Wang Y，etc. Kinetic Models for the Coke Combustion on Deactivated ZSM-5/MOR Derived from n-Heptane Cracking[J]. Ind Eng Chem Res，2010，49(1)：89-93