Estimation of boiling points of organic compounds at various pressures using recurrent relations |
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Authors: | I G Zenkevich R E Kostikov |
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Institution: | (1) Chemical Faculty, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia |
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Abstract: | A new approach is proposed for the estimation of boiling points (T b) of organic compounds at reduced pressure from their values at atmospheric pressure based on the application of a recurrent relation: T b (log P + Δlog P) = aT b (log P) + b. Estimation of coefficients in this relation for the compounds different by their chemical nature gives the following average values: a = 1.126, b = ?41.7. Successive application of this relation with Δlog P = 1 (that corresponds to 10-fold decrease in pressure) allows estimation of the T b values at the pressure values of 100, 10 and 1 torr from the value of T b (760 torr) by simple arithmetic calculation with an average accuracy about 8°C. |
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