Compressibilitv of Ethane Propylene Vapor Mixtures

Prengle, H. W.; Marchman, Henry

doi:10.1021/ie50491a049

Cited by 8 publications

(2 citation statements)

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“…Benedict (6) employed manual methods which coupled with experience in the field enabled him to attain a consistent set of constants for the lighter paraffin hydrocarbons. More recently Marchman and Prengle (13,16) have computed the constants for propene and for mixtures of propene and ethane. The determination of the constants for all the hydrocarbons of practical interest to the petroleum industry is a task of some magnitude.…”

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confidence: 99%

Evaluation of Equation of State Constants with Digital Computers

Brough¹,

Schlinger²,

Sage³

1951

Ind. Eng. Chem.

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Equations of state appear to be useful in predicting the volumetric and phase behavior of multicomponent mixtures of the lighter hydrocarbons. The evaluation of the constants for each of the several components is a tedious and somewhat time-consuming operation. Automatic digital computing equipment offers a possible means of performing formalized calculations of this type and decreasing the time involved.Commercially available digital computing equipment was applied to the evaluation of the constants for the Benedict equation of state from volumetric data. Conventional least squares techniques have been utilized in determining values of the seven constants in this equation for methane and for propane. These quantities were calculated for each of three different values of one constant H E prediction of the volumetric and phase behavior of T h y d rocarbons is a matter of considerable importance to the petroleum industry. The status of thermodynamic data for the industry has been reviewed (18,19). For many years it has been known that the simplifying assumptions of perfect gases and negligible volume for the liquid phase which form the basis for Raoult's law are inadequate for describing the behavior of hydrocarbon mixtures a t elevated pressures. Ideal solutions ( l a ) based upon additivity of volumes of the components also failed to yield a eatisfactory generalization of the volumetric and phase behavior of hydrocarbon mixtures.The more complex equations of state which recently have become available primarily aa a result of the efforts of Beattie and Bridgeman (9) have eatablished another approach to the prediction problem. The "general limit method" discussed by Beattie (1) &or& a means of estimating both the volumetric and phase behavior of mixtures with an accuracy comparable to that with which the equation of state represents the volumetric behavior of the system. The recent work of Benedict (6, 6) resulted in m equation which accurately describes (10) the volumetric behavior of hydrocarbon mixtures in the gas phase and for the bubble point liquid.can be employed to ascertain the volume, enthalpy, and entropy of phases m well as their composition in heterogeneous equilibria with a minimum of manual effort (8). However, the evaluation of the constants for the Benedict equation from experimental data is a laborious and time-consuming process. Benedict (6) employed manual methods which coupled with experience in the field enabled him to attain a consistent set of constants for the lighter paraffin hydrocarbons. More recently Marchman and Prengle (23, 16) have computed the constants for propene and for mixtures of propene and ethane. The determination of the constants for ell the hydrocarbons of practical interest to the petroleum industry is a task of some magnitude. The present discussion considers the application of least squares techniques ( 1 4 ) by means of an automatic digital computer to the evaluation of constants of the Benedict equiitiori of state for the lighter AvailFble digital computing equipment .

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confidence: 99%

Evaluation of Equation of State Constants with Digital Computers

Brough¹,

Schlinger²,

Sage³

1951

Ind. Eng. Chem.

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show abstract

“…At higher pressures large variations from experiment are realized and these coefficients do not describe the behavior in the liquid region satisfactorily. Marchman and coworkers (12,14) computed coefficients for propene and mixtures of propene and ethane. More recently Benedict, Webb, and Rubin (4) reported values of the coefficients for 12 hydrocarbons including propane.…”

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confidence: 99%