Method for Determination of Two-Phase Interface Area in Oil-Water Mixture

A measurement method and interface area technology, which is applied in the direction of measuring devices, surface tension analysis, surface/boundary effects, etc., can solve the problems of limited application of interface adsorption method, more serious influence of stirring conditions, and inestimable errors, etc.

Active Publication Date: 2011-12-07
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

However, the existing interface adsorption method has great limitations. It requires that the area of ​​the two-phase interface increases greatly during high-speed stirring, and the amount of change in the concentration of surfactant in the organic phase of the bulk before and after stirring can be measured, and the amount of change It is usually a trace amount, so the concentration of surfactant in the system is also required to be in a trace amount
In the actual system of post-treatment, the amount of extractant is mostly not at trace level, so the application of interface adsorption method in post-treatment extraction system is limited
[0009] In addition, the photographic method is also commonly used to measure the interface area between two mixed phases of oil-water, but the results measured by this method are only close to the wall, and the results here represent the results of the entire dispersion system, and the error between them cannot be determined. estimate
The application of light scattering method to measure the interface area between two phases of oil-water mixture has also been reported, but this method requires other methods for calibration, and the introduction of probes in the system will change the flow conditions in the measurement area, which will have a greater impact on the stirring state during high-speed stirring. serious

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  • Method for Determination of Two-Phase Interface Area in Oil-Water Mixture
  • Method for Determination of Two-Phase Interface Area in Oil-Water Mixture
  • Method for Determination of Two-Phase Interface Area in Oil-Water Mixture

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[0027] The technical solution of the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0028] At t=21°C, 30% TBP-kerosene and 1.0mol / L HNO 3 The value of the interface area between the two phases at different rotational speeds when the solution system is stirred at high speed. The volume of the aqueous phase is 15.0 mL, the volume of the organic phase is 30.0 mL, the volume of the reaction vessel is 3.0 cm×3.0 cm×6.0 cm, and the stirring blade is in the water phase. In this stirring system, 30% TBP-kerosene is the dispersed phase and belongs to low viscosity material.

[0029] Its operation process is as follows.

[0030] 1) The measured real system (30%TBP-kerosene+1mol / L HNO 3 ) The interfacial tension in ) is 9.2mN / m.

[0031] 2) Prepare TBP-kerosene solutions containing different concentrations of TBP, and measure the different concentrations of TBP-kerosene solutions and 1.0mol / L HNO 3 Interfacial tension of aqueous s...

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Abstract

The invention discloses a method for measuring the interface area of ​​two phases when oil-water is mixed. It establishes a simulation system that is approximately the same as the real system under the same stirring conditions, and uses the simulation system to indirectly measure the value of the two-phase boundary area in the real system, thus greatly broadening the application conditions and scope of the interface adsorption method. .

Description

technical field [0001] The invention belongs to the technical field of extraction kinetics of binary compounds, and in particular relates to a method for measuring the interface area of ​​two phases when oil-water is mixed. Background technique [0002] Determination of the two-phase boundary area is a key to the application of high-speed stirring method to study extraction kinetics. Only after obtaining this parameter can we further judge when the influence of diffusion and mass transfer will be eliminated, and further measure the reaction rate constant and the reaction order of each reactant. number. Surfactant refers to a substance that has fixed hydrophilic and lipophilic groups, can be aligned on the surface of the solution, and can significantly reduce the surface tension. Most extraction agents or stripping agents are surfactants, which have surface activity. This results in adsorption on the interface. According to the Gibbs isotherm adsorption equation, changing t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N13/02
Inventor 李传博郑卫芳张宇晏太红卞晓艳左臣张柏青张瑾珠周燚平
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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