The influence of power ultrasound (20 kHz) on the rate of attainment of saturation of sparingly soluble benzoic acid in distilled water and in 24% (w/w) aqueous glycerol was experimentally investigated at 30 °C. The importance of proper temperature control of process vessel contents when it was irradiated with high ultrasonic power level settings was demonstrated. A method was proposed to calculate the volumetric mass transfer coefficient under non-isothermal conditions. © 2009 Elsevier B.V. All rights reserved.

Aravamudan Kannan

Department Of Chemical Engineering

D. Krishna Sandilya

benzoic acid

Supersaturation

Temperature control

Ultrasonics

Volumetric analysis

AQUEOUS GLYCEROLS

DISTILLED WATER

Non-isothermal condition

POWER ULTRASOUND

PROCESS VESSELS

Solubility limits

ULTRASONIC POWER

VOLUMETRIC MASS TRANSFER COEFFICIENT

MASS TRANSFER

Glycerol

Stainless steel

Water

aqueous solution

article

Crystallization

echography

irradiation

particle size

phase transition

priority journal

solid

solubility

Temperature

Fulltext

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Ultrasonics Sonochemistry

The efficacy of power ultrasound of 20 kHz in enhancing the volumetric mass transfer coefficient was investigated in this study. Breakage and dissolution of sparingly soluble benzoic acid dispersed in either water or 24% aqueous glycerol was monitored as a function of time and ultrasound power input. Particle size measurements were carried out at intermediate times during the experiment to estimate the mean particle size and surface area. Linear combination of lognormal distributions was found to fit the experimental particle size distribution data. The De Brouckere mean diameters (d 43) obtained from the particle size distributions decreased with increase in the ultrasonic power level. Empirical correlations were developed for the evolution of surface area as a function of ultrasonic energy input per unit mass. The effect of ultrasound on the intrinsic mass transfer coefficient (kc) could be decoupled from the volumetric mass transfer coefficient (kca) as the surface area was also estimated. Different approaches involving either constant or variable intrinsic mass transfer coefficients were employed when carrying out the delineation. Mass transfer rates were enhanced due to both higher ultrasound induced intrinsic convective mass transfer coefficient and additional surface area created from particle breakage. To delineate the effects of particle breakage from solid dissolution, experiments were also carried out under non-mass transfer conditions by pre-saturating the solvents with benzoic acid. Both the solid-liquid systems examined in the present study attained saturation concentration when the ultrasonic energy input per unit mass was approximately 60 kJ/kg, irrespective of the ultrasonic power level setting. © 2011 Elsevier B.V. All rights reserved.

Quantification of surface area and intrinsic mass transfer coefficient for ultrasound-assisted dissolution process of a sparingly soluble solid dispersed in aqueous solutions

The effect of power ultrasound (20 kHz) on the dissolution rates of a spinning disk made from sparingly soluble benzoic acid was investigated. Ultrasound was found to intensify the dissolution rates especially at lower rotational speeds of the spinning disk. The ultrasonic intensification was found to decrease with increase in the rotational speed of the spinning disk. Empirical correlation was developed for the Sherwood number in the presence of ultrasound and mechanical rotation of the disk. From this, the intensification factor was derived in terms of ultrasonic power input and Reynolds number corresponding to the spinning disk. The intensification factor obtained in the current spinning disk configuration was compared with that obtained for the rotating cylinder configuration studied by Kannan and Pathan [Kannan, A.; Pathan, S. K. Enhancement of Solid Dissolution Process. Chem. Eng. J.2004, 102, 45.]. © 2011 American Chemical Society.

Industrial and Engineering Chemistry Research

Intensification of the dissolution of a sparingly soluble solid from a spinning disk in the presence of power ultrasound

The enhancement of the dissolution rate of the sparingly soluble benzoic acid in aqueous solution by solid rotation, ultrasound and chemical reaction was investigated. The analysis indicated the strong influence of the ultrasound energy dissipation rate on the enhancement. The overall enhancements due to the three means were compared. The enhancement due to ultrasound was found to be much greater than mechanical rotation and comparable to that of chemical reaction. © 2004 Published by Elsevier B.V.

Chemical Engineering Journal

Enhancement of solid dissolution process

Chinese Journal of Chemical Engineering

Ultrasonically Assisted Extraction of Isoflavones from Stem of Pueraria lobata (Willd.) Ohwi and Its Mathematical Model

Chemical Engineering and Processing: Process Intensification

Enhancement of solid dissolution by ultrasound

Ultrasonic extraction of oil from tobacco (Nicotiana tabacum L.) seeds

Korean Journal of Chemical Engineering

Simultaneous recovery of valuable metals from spent mobile phone battery by an acid leaching process

Effect of ultrasound on the solubility limit of a sparingly soluble solid

Journal	Data powered by TypesetUltrasonics Sonochemistry
Publisher	Data powered by TypesetElsevier
ISSN	13504177
Open Access	No