Vapor pressure correlation

One of the most successful correlations is called Antoine equation, which uses three coefficients. A, B, and C, which depend on the substance being analyzed. Antoine equation is as follows  

If Raoult s law and Dalton s law hold, values of can be calculated from the vapor pressure (PJ and the total pressure (P) of the system 

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If accurate Zg and Zl data are available, excehent AHv values < au be obtained by differentiating a vapor pressure correlation and using Eq. (2-54). If not, AZv may be esimateciby Haggenmacher s equation " ... 

This temperature is outside of the range of the vapor pressure correlation and below the freezing point of acetone (—95°C). However, it illustrates just how low temperatures must be to achieve very low concentrations of VOC. 

A Absorption factor in absorption (-), or annual cash flow ( ), or constant in vapor pressure correlation (N-m 2, bar), or heat exchanger area (m2)... 

C Concentration (kg-m , kmolm-3, ppm), or constant in vapor pressure correlation (K), or number of components (separate systems) in network design (-)... 

This can be empirically modified by introducing additional parameters to give the three-parameter Antoine equation by replacing T with (T + C), where C is a constant, which is the most common vapor pressure correlation used to represent experimental data (Zwolinski and Wilhoit 1971, Boublik et al. 1984, Stephenson and Malanowski 1987, and other handbooks). 

Mackay, D., Bobra, A. M., Chan, D. W., Shiu, W.-Y. (1982) Vapor pressure correlation for low-volatility environmental chemicals. Environ. Sci. Technol. 16, 645-649. 

Rordorf, B.F. Prediction of vapor pressures, boiling points and enthalpies of fusion for twenty-nine halogenated dibenzo-p-dioxins and fifty-five dibenzofurans by a vapor pressure correlation method. Chemosphere, 18(l-6) 783-788,1989. Rosen, J.D. and Carey, W.F. Preparation of the photoisomers of aldrin and dieldrin. 7 Agric. Food Chem., 16(3) 536-537,1968. Rosen, J.D. and Strusz, R.F. Photolysis of 3-(p-bromophenyl)-l-methoxy-l-methylurea, 7 Agric. Food Chem., 16(4) 568-573, 1968. 

Rordorf, B.F. 1989. Prediction of vapor pressures, boiling points and enthalpies of fusion for twenty-nine halogenated dibenzo-p-dioxins and fifty-five dibenzofurans by a vapor pressure correlation method. Chemosphere 18 783-88. 

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