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T. Sako, K. Shibata, N. Nakazawa, T. Sugeta, K. Otake, and M. Sato
[Proc. of the 3rd Korea-Japan Symp. on Separation Technol. Vol.1, pp.635-638, 1993]
We tried to concentrate a dilute furfural aqueous solution using supercritical fractionation technique which used a reflux column with temperature distribution and supercritical CO_{2} as a solvent. The reflux column worked well to concentrate the furfural far above the azeotropic composition of 35 wt% furfural solution. Furthermore the furfural concentration in the effluence could be predicted satisfactorily by the material balance of CO_{2}, H_{2}O, furfural and the flash calculation with the Peng-Robinson equation of state.