System and method for determining vapor pressure of liquid compo

Details System and method for determining vapor pressure of liquid compo System and method for determining vapor pressure of liquid compo

1990-10-26

1992-12-22

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Vapor pressure

G01N 714

Patent

active

051725860

ABSTRACT:
True vapor pressure of liquid compositions, particularly multi-component compositions, is measured by a piston and cylinder apparatus defining an expansible chamber in which a simple of liquid is trapped, the chamber is expanded in multiple steps and multiple pressure and temperature measurements are taken at each expansion over a period of time. A resultant pressure at each expansion is determined from multiple measurements using the least squares method of approximation and the plural resultant pressure values are extrapolated to determine true vapor pressure using a straight-line approximation. The apparatus is adapted to continuously measure vapor pressure of a process stream by sampling a slipstream of liquid which is maintained at a constant temperature. The apparatus cylinder includes a bore which is closed at one end by a pressure transducer defining an end wall of the measurement chamber. The apparatus is mounted horizontally to minimize liquid depth and increase the rate of bubble formation during expansion of the chamber.

REFERENCES:
patent: 3528440 (1970-09-01), Plucker
patent: 4543819 (1985-10-01), Chin et al.
patent: 4783989 (1988-11-01), Reed
patent: 4905505 (1990-03-01), Reed

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