Estimation Of Critical Pressures Research Articles

Estimation of critical pressures by the rackett equation

Two methods for calculating critical pressure ( P c ) values from liquid density data by using the Rackett equation are proposed. The reliability of these methods is discussed on the basis of the results obtained by predicting the P c values of nearly 100 organic compounds which are representative of many structural types. Several strategies to improve the accuracy of the proposed methods are also discussed.

ChemInform Abstract: THE CORRELATION AND ESTIMATION OF VAPOR PRESSURES. IV. EXTRAPOLATION OF VAPOR R PRESSURES AND ESTIMATION OF CRITICAL PRESSURES BY THE PRINCIPLE OF CORRESPONDING STATES USING TWO REFERENCE FLUIDS WITH NONSPHERICAL MOLECULES

Chemischer InformationsdienstVolume 15, Issue 35 Article ChemInform Abstract: THE CORRELATION AND ESTIMATION OF VAPOR PRESSURES. IV. EXTRAPOLATION OF VAPOR R PRESSURES AND ESTIMATION OF CRITICAL PRESSURES BY THE PRINCIPLE OF CORRESPONDING STATES USING TWO REFERENCE FLUIDS WITH NONSPHERICAL MOLECULES D. AMBROSE, D. AMBROSESearch for more papers by this authorN. C. PATEL, N. C. PATELSearch for more papers by this author D. AMBROSE, D. AMBROSESearch for more papers by this authorN. C. PATEL, N. C. PATELSearch for more papers by this author First published: August 28, 1984 https://doi.org/10.1002/chin.198435079Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume15, Issue35August 28, 1984 RelatedInformation

The correlation and estimation of vapour pressures IV. Extrapolation of vapour pressures and estimation of critical pressures by the principle of corresponding states using two reference fluids with non-spherical molecules

Application of the principle of corresponding states is today usually based on two reference fluids, one of which is a simple fluid with acentric factor ω = 0 and the other a fluid with ω = 0.4. It is shown here that the use of two real fluids, such as propane and octane, or benzene and pentafluorotoluene with ω ≈ 0.2 and ω ≈ 0.4, to provide the reference lines gives better estimates of critical pressures from observed vapour pressures in the range 10 to 200 kPa, and the accuracy is similar to that obtained by use of the method of constrained extrapolation proposed in an earlier paper in this series. The two-real-fluid method also gives better correlation of observed vapour pressures throughout the range of reduced temperatures 0.5 to 1.0. Whichever pair of reference fluids is chosen, the principle of corresponding states is superior for both estimation and correlation to comparison with the behaviour of a single reference fluid.

Estimation of critical pressure in Flory's theory of binary mixtures

An alternative method is suggested to estimate critical the pressure used in Flory's theory of binary mixtures. The method requires-configurational energies instead of thermal pressure coefficients. The results are in fair agreement with those estimated by other methods.