Critical properties Ambrose

Critica.1 Properties. Several methods have been developed to estimate critical pressure, temperature, and volume, U). Many other properties can be estimated from these properties. Error propagation can be large for physical property estimations based on critical properties from group contribution methods. Thus sensitivity analyses are recommended. The Ambrose method (185) was found to be more accurate (186) than the Lyderson (187) method, although it is computationally more complex. The Joback and Reid method (188) is only slightly less accurate overall than the Ambrose method, and is more accurate for some specific substances. Other methods of lesser overall accuracy are also available (189,190) (T, (191,192) (T, P ),... 

D. Ambrose, Correlation and Estimation ofVapor-Eiquid Critical Properties. I. Critical Eemperatures of Organic Compounds,NMoa-A Physical Laboratory, Teddington, UK, NPL Report 92 (1978, corrected 1980). 

Compiled from Daubert, T. E., R. P. Danner, H. M. Sibul, and C. C. Stebbins, DIPPR Data Compilation of Pure Compound Properties, Project 801 Sponsor Release, July, 1993, Design Institute for Physical Property Data, AlChE, New York, NY and from Ambrose, D. Vapour-Liquid Critical Properties , Report Chem 107, National Physical Laboratory, Teddiugtou, UK, October, 1979. 

Ambrose, D., VAPOUR-LIQUID CRITICAL PROPERTIES. National Physical Laboratory, Teddington, England, NPL Report Chem 107 (Feb., 1980). 

Ambrose, D., Sprake, C.H.S., and Townsend. R. Thermodynamic properties of aliphatic compounds. Part 1.-Vapour pressure and critical properties of 1,1,1-trichloroethane, J. Chem. Soc., Faraday Trans. 1, 69 839-841,1973. 

The critical properties ot methyl ether v-> and ethyl cther Afcl have been determined experimentally. Ambrose and co-workers have determined the cnticul properties ... 

Choice of critical properties for the calulation of solubility (y) of solids in CO2 using the PR equation (1 - Ambrose with Tb Constantinou Gani 2 - Ambrose with Tb Lydersen modified by Joback 3 - Lydersen modified by Joback 4 - Constantinou and Gani). 

Ambrose, D., Vapor-liquid Critical Properties, N. P. L. Teddington, Middlesex, Rep. 107, 1980 Kudchaker, A. P, G. H. Alani, and B. J. Zwolinski, Chem. Revs. 68 659-735, 1968 Matthews, J. E, Chem. Revs. 72 71-100, 1972 Simmrock, K., R. Janowsky, and A. Ohnsorge, Critical Data of Pure Substances, Parts 1 and 2, Dechema Chemistry Data Series, 1986 Other recent references for critical data can be found in Lide, D. R., CRC Handbook of Chemistry and Physics, 86th ed., CRC Press, Boca Raton, Fla., 2005. 

Organic molecules The Ambrose method is recommended for all three critical properties of hydrocarbons and n-alcohols. The Joback method is recommended for r and of all other organic molecules. Fedors method is recommended for of these compounds, but the Joback method can also be used. 

Reference Ambrose, D., Correlation and Estimation of Vapour-Liquid Critical Properties. I. Critical Temperatures of Organic Compounds, Natl. Rhys. Lab. Report Chem. 92 (1978) Correlation and Estimation of Vapour-Liquid Critical Properties. II. Critical Pressures and Volumes of Organic Compounds, Natl. Rhys. Lab Report Chem. 98 (1979). 

Lydersen, A.L. (1955) Estimation of Critical Properties of Organic Compoimds. Report 3, University of Wisconsin College of Engineering, Engineering Expirement Station, Madison, WI. Ambrose, D., National Physical Laboratory (1978) NPL Rep. Chem., 92, corrected 1980. 

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