SU1068776A1 - Device for determination of inter-phase tension in liquid-liquid system - Google Patents

Abstract

THE DEVICE FOR DETERMINATION OF THE INTERPHASE TENSION IN THE SYSTEM LIQUID - A LIQUID containing two chambers - upper and lower, connected by a tube and a capillary, about tl and -. In order to simplify the determination process, the chambers are made with one common wall, the capillary B is filled in the form of a rolled hole in the wall, and one of the ends is recessed into the lower chamber. (L s: 00 cr

Description

The invention relates to techniques for measuring the physicochemical characteristics of liquids and can be applied, in particular, in the oil industry in determining the interfacial tension at the oil-5 water interface in a wide range of pressure changes for oil saturation with gas.

A device is known for determining the surface tension of a liquid by the method of a maximum pressure of 10 bubbles, consisting of a manometric vessel, a reservoir in it with a calibrated capillary and a gas pressure source. The pressure of slip of the gas bubble is fixed (5 is fixed by the difference in liquid level "in the manometric tube and the height of the tip of capillary I1.

The device is relatively simple, but cannot be used 20 as for determining the interfacial tension at the interface of two liquids,. and gas-saturated liquids, i.e. at pressures other than atmospheric. 25

The technical solution closest to the invention is a device for determining interfacial tension in a liquid-liquid’s system, containing two chambers - an upper and a lower one, connected by a tube and a capillary. The device implements a method of capillary lifting, according to which the interfacial tension is determined by the position of the meniscus separating the two liquids in the capillary-35 lar after filling the system with liquids 0 21.

The disadvantage of this device is the complexity of determining the interfacial tension, since in addition to the height of the meniscus, it is necessary to know the contact angle at the liquid-glass interface, which must be measured independently.

The purpose of the invention is to simplify the determination process by eliminating the need for independent determination of the contact angle. This goal is achieved by the fact that in the device for. for determining the interfacial tension in a liquid – liquid – liquid system containing two chambers, the upper and lower, connected by a tube and a capillary, the chambers are made with one common wall, the capillary is 55 made as a capillary hole in the wall, and one of the ends of the connecting tube is recessed into the lower chamber.

The drawing schematically shows the 60 proposed device.

The device consists of two chambers of the upper 1 and lower 2, made with one common wall, in which a calibrated capillary 3 and a transfer pipe 4 are mounted much longer than the capillary.

To fill the upper and lower parts of the chamber 1, shut-off devices 5 and 6 are used. The chambers are located in the thermostat 7, are mounted on the bracket 8 and have a recorder 9 of the liquid separation level.

The device operates as follows.

The chamber 2 through the locking device 5 with the open locking device b is filled with one of the investigated liquids with a higher density. Then, through the same locking device, liquid of lower density is supplied in an amount approximately equal to the volume of the lower chamber 2, which, accumulating under the common wall, displaces the higher density liquid through the transfer pipe 4 into the chamber 1, and out of it through the locking device 6.

After filling and creating the necessary pressure, the locking devices 5 and 6 are closed through the transfer tube 4, the flow of higher density liquid from chamber 1 to chamber 2 begins. At the same time, lower density liquid from chamber 2 is transferred through the calibrated capillary 3 to the chamber 1. as long as the capillary pressure does not balance the pressure of displacing a liquid of a lower density with a heavier liquid. After the flow ceases, the height is determined. h of the remaining liquid column of lower density in the 'lower' chamber 2. Interfacial tension 4 is found by the formula g where r is the effective radius of the capillary 3, m;

§ - acceleration of free fall, m / s ² ;

h is the height of the liquid column, m;

ar is the difference in densities of the studied ^ζ liquids, kg / m ^g .

The application of the invention will greatly simplify the procedure for determining interfacial tension in a liquid-liquid system at pressures above atmospheric, i.e. in carbonated liquids, since there is no need for additional measurement of the contact angle.

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Order 11452/37 Circulation 827 Subscription

Branch of PPP Patent, Uzhgorod, Project 4,

Claims (1)

DEVICE FOR DEFINITION INTER-PHASE TENSION IN THE SYSTEM LIQUID - LIQUID, containing two chambers - upper and lower, connected by a tube and a capillary, about t and -. characterized in that, in order to simplify the determination process, the chambers are made with one common wall, the capillary is made in the form of a capillary hole in the wall, and one of the ends is recessed into the lower chamber. 1068776.