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題名 | 以等張體積推測純烴類的臨界溫度 |
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作者 | 邱茂信; 張耀堃; | 書刊名 | 技術學刊 |
卷期 | 7:1 1992.03[民81.03] |
頁次 | 頁67-72 |
分類號 | 461.62 |
關鍵詞 | 純烴類; 推測; 等張; 溫度; 臨界; 體積; |
語文 | 中文(Chinese) |
中文摘要 | 本文提出一種簡單經驗模式Tc=A +B[P],以煙類等張體積關聯其臨界溫度。針對烷烴、環烷烴及芳香烴共85個數據的試驗,顯示本文方法的平均誤差為1. 292 %,而文獻所推荐的Nokay法及Riazi-Daubert法的推測平均誤差分別為0.633 % 及0. 937 % 。雖然Nokay法及Riazi-Daubert法的總平均誤差較低,但此二法皆需藉助二個物質性質(正常準點及比重)以計算Tc。而本文方法僅須利用等張體積。若採用一種雙曲線關聯式Tc = □,可進一步改善本文方法對於環烷烴及芳香烴的推測能力, 並使其精確度接近最佳的Nokay法。本文為純質所發展的關聯方法,預期也能延伸處理窄準點範圍的芳香烴餾份。由以上的比較指出,本文依據等張體積的關聯方法,不失為推測臨界溫度的一種簡單且可靠的選擇途徑。 |
英文摘要 | An empirical model of Tc = A + B [P] has been proposed to correlate critical temperatures of pure hydrocarbons with their parachors. When tested against 85 critical temperature data of hydrocarbons encompassing alkanes, alkenes, cycloalkanes and aromatics elucidates that our method yields an average absolute error of 1.292% compared to 0.633% and 0.937%, respectively, for the methods of Nokay and Riazi-Daubert previously recommended. Although the latter two methods produce smaller overall average deviations, they call for a knowledge of two properties (normal boiling point and density) in order to compute Tc, whereas our method employs only the parachor for each substance. A hyperbolic form of correlation Tc □can further improve the predictability of our method for the cases of cycloalkanes and aromatics with accuracy almost tantamount to the best method of Nokay. It is expected that the present approach developed for pure substances can also be extended to apply to narrow-boiling aromatic fractions. These comparisons show that the proposed correlation based on the parachor is a good alternative for the rapid estimation of critical temperatures with a reasonable order of accuracy. |
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