Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Vapor pressure
Patent
1984-01-13
1985-07-09
Miles, Tim
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Vapor pressure
G01N 1302
Patent
active
045274215
ABSTRACT:
An improved apparatus and method are disclosed for measuring the dynamic surface tension at a gas-liquid interface by the maximum bubble pressure method. The gas is bubbled out an orifice tube dipped in the liquid; the maximum pressure in each bubble is a function of the surface tension. In the invention, the rate of gas flow is raised continually to increase the rate of bubbling at least several fold over a few minutes. The varying pressure of the bubbling gas is measured continuously by an instantaneous transducer. Electronic circuits respond to the transducer and provide signals indicative of the maximum bubble pressure and of the rates of bubbling. A recorder responds to the signals and displays a spectrum of the maximum bubble pressure in units indicative of surface tension as a function of the bubbling rate. Measurements may be taken over more than a thousand bubbles in each spectrum. The rise in gas pressure is achieved by passing gas from a source under pressure in series through two flow-restricting capillaries, with an accumulator zone between.
REFERENCES:
patent: 3426584 (1969-02-01), Smith
patent: 3881344 (1975-05-01), Jobe
patent: 4416148 (1983-11-01), Klus et al.
A. M. Kragh, Trans. Faraday Soc. 60 (Part I), pp. 225-232, (1964), Effect of Gelatin and Salts on the Dynamic Surface Tension of Manoxol OT.
W. C. Meyer, Preprint AIME Annual Meeting, Atlanta, GA, Mar. 6-10, 1983, Application of Dynamic Surface Tensiometry to Froth Flotation.
A. K. Gaigalas et al, AIChE Journal 28, pp. 922-928, (1982), Time Dependence of Pressure in a Bubbler Tube.
Halldorson Burke M.
Miles Tim
The Dow Chemical Company
Yates William M.
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