Abstract
The agitation of immiscible liquids or solid suspensions is a frequent operation in chemical and metallurgical industries. The product quality yield and economy of the processes are significantly affected by mixing conditions. Prediction of mean drop size distribution (DSD) during agitation is fundamental for processes in many branches of industry where the mass transfer is crucial. This contribution aims to analyze the homogeneity of a dispersed system in a vessel agitated by a high-shear sawtooth impeller. The homogeneity of liquid–liquid dispersion is determined by comparison of Sauter mean diameters and drop size distribution (DSD) from different measured regions and for various dispersion times. The experiments were carried out in a baffled vessel for various impeller speeds. The sizes of droplets were obtained by the in-situ measurement technique and by the image analysis (IA) method.
Highlights
The dispersion of immiscible liquid–liquid systems is one of the complex processes in the mixing field which is widely used in many branches of industry.This process aims to reach the dispersion and equal distribution of small droplets of a dispersed phase in the continuous phase for an increase of interfacial surface which leads to mass transfer intensification.The review on correlations evaluating mass transfer coefficients in liquid–liquid was presented by Ghotli et al [1].A wide variety of experimental techniques have been utilized to monitor evolving drop size distribution (DSD) in agitated vessels
Sauter diameters size distributions in areas was used as a criterion of homogeneity
The in-situ measurement method performed by the different areas was used as a criterion of homogeneity
Summary
The dispersion of immiscible liquid–liquid systems is one of the complex processes in the mixing field which is widely used in many branches of industry (e.g., chemical, food, metallurgical).This process aims to reach the dispersion and equal distribution of small droplets of a dispersed phase in the continuous phase for an increase of interfacial surface which leads to mass transfer intensification.The review on correlations evaluating mass transfer coefficients in liquid–liquid was presented by Ghotli et al [1].A wide variety of experimental techniques have been utilized to monitor evolving drop size distribution (DSD) in agitated vessels. The dispersion of immiscible liquid–liquid systems is one of the complex processes in the mixing field which is widely used in many branches of industry (e.g., chemical, food, metallurgical). This process aims to reach the dispersion and equal distribution of small droplets of a dispersed phase in the continuous phase for an increase of interfacial surface which leads to mass transfer intensification. A wide variety of experimental techniques have been utilized to monitor evolving drop size distribution (DSD) in agitated vessels. The first group is based on sampling procedure and ex-situ measurement is performed on the emulsion before it coalesces or when the emulsion is stabilized. Ghotli et al [5] used the microscopic method combined with image analysis for the drop size determination for radial disc impellers with variously curved blades and axial impellers
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