A Method for Calculating the Heat of Vaporization at Normal Boiling Point

张克武

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A Method for Calculating the Heat of Vaporization at Normal Boiling Point

更新时间：2025-12-16

- A Method for Calculating the Heat of Vaporization at Normal Boiling Point
- CIESC Journal Issue 1, (1982)
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- Online First：25 March 1982，
  
  Published：25 March 1982
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张克武. A Method for Calculating the Heat of Vaporization at Normal Boiling Point[J]. CIESC Journal, 1982, (1).
DOI：

张克武. A Method for Calculating the Heat of Vaporization at Normal Boiling Point[J]. CIESC Journal, 1982, (1). DOI：

摘要

在分析了文献上计算汽化热的主要公式的基础上

解Clapeyron方程;并将上限延伸到临界点的温度和压力

再引进参数K_1

K_2值

提出了计算液体汽化热的新公式

即 r_b=K_2{[T_bT_c/（T_c-T_b）]+K_1}logP_c式中参数K_2则考虑不同分子结构提出不同的数值

以有助于计算的准确性。本文用此新公式验算了31类共157种纯物质的液体汽化热

与实测值相比

平均误差为1.65％。

Abstract

A new equation for calculating the heat of vaporization was derived For alkanes

monoolefines

ethers (nonring)

nitrils

ketones (ring and nonring)

organic acids and organic anhydrides

K2 = 4.358 For alkylbenzenes and polyphenyls(biphenyls

terphenyls) K2 = 4. 435 For cyclitols

alcohols(except diols

aromatic alcohols)

K2 = 4.581 For all other compounds and gases

Where Tt - normal boiling point

K Tc - -critical temperature

K Pc - critical pressure

atm. This equation applies to nonpolar and polar liquids at their normal boiling points and gives average and maximum errors of 1.65% and 12. 2% respectively for 157 compounds.

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