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Critical Properties and Vapor Pressure Equation for Alkanes Cnh2N+2 : Normal Alkanes with Ns36 and Isomers for N= 4 through N=9

By Lemmon, Eric W.

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Book Id: WPLBN0000660763
Format Type: PDF eBook
File Size: 4.18 MB.
Reproduction Date: 2005
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Title: Critical Properties and Vapor Pressure Equation for Alkanes Cnh2N+2 : Normal Alkanes with Ns36 and Isomers for N= 4 through N=9  
Author: Lemmon, Eric W.
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Language: English
Subject: Technology., Reference materials, Technology and literature
Collections: Techonology eBook Collection
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Lemmon, E. W. (n.d.). Critical Properties and Vapor Pressure Equation for Alkanes Cnh2N+2 : Normal Alkanes with Ns36 and Isomers for N= 4 through N=9. Retrieved from http://hawaiilibrary.net/


Description
Technical Reference Publication

Excerpt
Introduction: Numerous equations can be used to represent the vapor pressure pl+g of a pure fluid (e.g., Ambrose, 1980, 1986, Ambrose and Tsonopoulos, 1995, Iglesias-Silva et al., 1987, Ruzicka and Majer, 1996). Of particular significance is the empirical equation proposed by Wagner (1974) and Wagner et al. The subscript c identifies the critical condition and the ai are adjustable parameters determined by regression analysis. The critical pressure and temperature are incorporated in the vapor pressure equation as reducing parameters. Section 2 provides an analysis of the critical temperatures and pressures of the normal alkanes used for these parameters. The coefficients and the particular functional form of Eq. (1) were determined with statistical methods. The functional form presented in Eq. (1) can be written...

Table of Contents
Contents 1. Introduction.. .............................. 3 2. Critical Properties.. ......................... 4 2.1. Critical Temperature for the Normal Alkanes ............................... 4 2.2. Critical Pressure for the Normal Alkanes. ... 5 3. Vapor Pressure Measurements from the Literature .................................. 7 4. Vapor Pressure.. ........................... 7 4.1. n-Alkanes. ............................ 7 4.2. Isomers of the n-Alkanes.. ............... 26 5. Comparisons.. ............................. 26 6. Uncertainty of the Model. .................... 31 a'Author to whom correspondence should be addressed. Electronic mail: ericl@boulder.nist.gov b)~resenta ddress: Schlumberger Cambridge Research, Madingley Road, Cambridge, CB3 OEL, U.K. Electronic mail: AGoodwinBslb.com 02000 by the U.S. Secretary of Commerce on behalf of the United States. All rights reserved. This copyright is assigned to the American Institute of Physics. 7. Acknowledgments.. . . . . . . . . . . . . . . . . . . . . . . . . 35 8. References.. ............................... 35 List of Tables 1. Coefficients a, of Eq. (20) for T,, b, of Eq. (21) for p, , and ci of Eq. (24) for o. .............. 5 2. Values of T, , p, , and w for the normal alkanes used in Eq. (12). ........................... 6 3. Experimental methods used to determine vapor pressure, the precision and accuracy in temperature AT, the precision and accuracy in pressure Ap, and fluids studied. ............... 8 4. Summary of experimental hydrocarbon vapor pressure data, including total uncertainty in p'+g at the minimum T ~an,d m aximum T,, temperature of the measurements. ............. 14 5. Coefficients of the generalized vapor pressure equation, Eq. (12), determined in this work.. .... 26 6. Values of T, , p, , and w for the branched 0047-2689/2000/29(1)11139/$31.O O 1 J. Phys. Chem. Ref. Data, Vol. 29, No. 1, 2000

 

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