The application of simulated moving bed chromatography for the separation between 2,6- and 2,7-dimethylnaphthalene
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The Application of Simulated Moving Bed Chromatography for the Separation Between 2,6- and 2,7-Dimethylnaphthalene Young Dae Kim ~, Joong Kee Lee*"and Young Sang Cho*" Faculty of Applied Chemistry, Chonnam National University, 300 Yongbong, Kwangju 500-757, Korea *Clean Technology Center~ K1S'I; RO. BOX 131, Cheongryang, Seoul t36-791, Korea (Received 27 February 2001 " accepted 9 .hdy 200t)
Abstract-The possibiliLv of applying SMB chromatography tbr the separation of 2,64)MN and 2,7-DMN was investigated by numerical simulation based on the single column chromatography experimental data. It was lbund that 2,6-DMN csmld be separated lix)m 2,7-DMN in the ODS-modifid silica gel by' using methanol and water as the mobile phase. A systematic method of obtaining model parameters for the SMB simulation from single column chromatography experiments was presented. The adsorption isotherms of 2,6-DMN and 2.7-D,MN were obtained by the pulse method. The mass transt;er kinetics was \,eTy fia.~t,indicating that the mobile phase and the stationary phase arc vet3 close to equilibrium tbr both 2,6-DMN ,and 2,7-DMN. SMB simulation w~s perlbnned by using the model parameters, Pure 2.6-DMN and 2,7-DMN can be obtained by selecting suitable operating conditions, indicating that SMB chromatography can be employed to sepaa-ate 2.6-DMN and 2,7-DMN. The influence of operating parameters (li~ed flow rates, raffinate llow rate, and switch timet was al~ investigated to mcomlnend the optimum operating conditions. Key words: SMB. Chromatography, Dimethylnaphthalene, Separation
INTRODUCTION
technique for the economical separation of pure 2,6-DMN and 2,7DMN, whose separation is nearly impossible and uneconomical in other separation techniques (e.g., distillation and crystallization) due to their very close physical properties. However, the operating conditions of SMB chromatography cannot be obtained simply but can be obtained by rigorous experiments and/or simulations, Therefore, a systematic SMB simulation method would be a great help to guide selecting the optimum operating conditions for the separation between 2,6-DMN and 2,7-DMN in SMB chromatography application. In this study the possibility of applying SMB chromatography for the separation of 2,6-DMN and 2,%DMN was investigated. The SMB operating conditions for 2,6-DMN complete separation, along with the influences of operation parameters on the 2,6-DMN separation (purity, yield, and recovery), were investigated in ODS (octadecylsilyl) modified silica gel. Systematic methods for model parameter estimation of SMB chromatography from the single column chromato2m~aphy data were presented and the influence of operating parameters (feed flow rate, rafl]nate flow rate, switch time, elc) was investigated by the numerical simulation of SMB chromatography.
2~6-Dimethylnaphthalene (DMN) is of great practical interest as a feed stock for the high performance polyester, polyethylenenaphthalate (PEN), which provides superior strength and heat resistance compared to polyethylene terephthalate (PET) i
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