TITLE: Gas-Liquid-Liquid Equilibria in Mixtures of Water, Light Gases, and Hydrocarbons: Progress Report, December 1, 1988-November 30, 1989.

AUTHOR: K. C. Chao.

INST.  AUTHOR: Purdue Univ., Lafayette, IN. School of Chemical Engineering.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1989,  1p.

NTIS ORDER NO.: DE90003180INW

ABSTRACT:

A Simplified augmented BACK equation of state has been developed for the description of gas-liquid-liquid equilibria in mixtures of water, light, gases, and hydrocarbons. The simplification facilitates application of the equation. In the Augmented BACK equation the polar pressure of water is the difference between two long expressions. One of these is the 26-term BACK equation written for the non-polar core of the water molecule, and the other is the Keeman steam table equation containing 55 equation constants. The complexity is compounded when derivation is made of the equation for fugacity, enthalpy and other thermodynamic quantities, leading to working equations that contain more than one hundred terms. The complexity presents a barrier to useful application. The new simplified equation has been extensively tested. Calculations with the Augmented BACK equation (before simplification) are described with example mixtures.  Included are mixtures of water + light gases, water + hydrocarbons, and polar substances in general. Phase equilibrium, density, and enthalpy are calculated. 3 figs.

REPORT  NUMBER: DOE/ER/13288-5

CONTRACT  NUMBER: FG02-84ER13288