One step in the preparation of nicotine sulfate from tobacco is the extraction of nicotine from aqueous solution by kerosene. Table 10.P1 shows equilibrium data for the distribution of nicotine between water and kerosene. Compute the kerosene water ratio required to remove 90 percent of the nicotine from the aqueous stream in a single equilibrium stage.

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Table 10.P1. Equilibrium distribution of nicotine between aqueous and organic phases. Data of J. B. Claffey, C. O. Badgett, J. J. Skalamera, and G. W. M. Phillips, Industrial & Engineering Chem., 92, 166-171 (1950). Nicotine in aqueous phase (I) (g/L) 0.62 1.49 2.92 5.70 11.8 17.9 24.9 31.5 Nicotine in organic phase (II) (g/L) 0.39 0.96 2.07 4.18 8.22 12.2 15.3 18.9