TITLE

Revealing the physicochemical mechanism for ultrasonic separation of alcohol–water mixtures

AUTHOR(S)
Kirpalani, D. M.; Toll, F.
PUB. DATE
August 2002
SOURCE
Journal of Chemical Physics;8/22/2002, Vol. 117 Issue 8, p3874
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The selective separation of ethanol from ethanol-water mixtures by ultrasonic atomization has been reported recently by Sato, Matsuura, and Fujii [J. Chem. Phys. 114, 2382 (2001)]. In that work, experimental data were reported that confirmed the generation of an ethanol-rich droplet mist and attempted to explain the selective separation in terms of parametric decay instability of the capillary wave formed during sonication. In the present work, an alternate mechanism based on the conjunction theory has been postulated for the process of ultrasonic atomization. This mechanism involves the formation of cavitating bubbles in the liquid during sonication and their eventual collapse at the liquid surface into a cloud of microbubbles that moves upwards in a capillary fountain jet. The selective separation of alcohols has been explained as a corollary effect of the physical mechanism resulting in a surface excess of alcohol molecules formed at the surface of the microbubbles. The alcohol molecules vaporize into the microbubbles and release an alcohol-rich mist on their collapse in regions of high accumulation of acoustic energy.
ACCESSION #
7131747

 

Related Articles

  • Thermodynamically driven incompressible fluid mixtures. Otto, Felix; E., Weinan // Journal of Chemical Physics;12/15/1997, Vol. 107 Issue 23, p10177 

    Compares two models describing the dynamics of phase separation of incompressible mixtures. Interfacial motion from the local model that arise via the Mullins-Sekerka law for moderate quenches; Effects of quench depth on interface dynamics; Convective mechanism of the nonlocal model.

  • Electronic Structure Effects in Extraction. II*. Mazalov, L. N. // Journal of Structural Chemistry;Mar/Apr2003, Vol. 44 Issue 2, p268 

    Liquid extraction is one of the most widely used methods for separating mixtures and extracting individual chemical compounds in pure form. For a description of extraction processes and mechanisms and types of extraction products, it is necessary to study the structure and composition of the...

  • Separation of isopropyl alcohol-water mixtures by pervaporation using copolymer membrane: Analysis of sorption and permeation. Kuila, S. B.; Ray, S. K. // Chemical Engineering Research & Design: Transactions of the Inst;Feb2013, Vol. 91 Issue 2, p377 

    Membrane made from copolymer of acrylonitrile and methyl acrylate designated as PANMA was used for pervaporative dehydration of isopropyl alcohol (IPA) over the concentration range of 75-100 wt% IPA in water. Sorption of the membrane was evaluated in terms of thermodynamic interaction parameters...

  • Ultrasonic Enhancement of Separation Azeotropic Mixtures via Single Distillation Column. Mahdi, Taha; Ahmad, Arshad; Ripin, Adnan; Nasef, Mohamed M. // Advanced Materials Research;2014, Issue 909, p83 

    a case study, the influence of ultrasonic intensity and frequency on the VLE of ethanol-ethyl acetate mixture was investigated, and a combination of five ultrasonic intensities (from 100 and 500 W/cm²) and three frequencies (from 25 to 70 kHz) were used. It is noted that with increase the...

  • Applicability of Rheological Models of Flow to Stearate-Stabilized Emulsions. Moukhtarova, S. E.; Krivoshchepov, A. F.; Kim, V. E. // Colloid Journal;Jan/Feb2004, Vol. 66 Issue 1, p112 

    The applicability of rheological models of flow to the description of structural�mechanical properties of stearate-stabilized emulsions is considered. The strengths of individual contacts are calculated within the framework of the Casson model.

  • Phase separation in mixtures of a rodlike colloid and two or more rodlike polymers. Sear, Richard P.; Frenkel, Daan // Journal of Chemical Physics;12/15/1996, Vol. 105 Issue 23, p10632 

    A suspension of rodlike colloidal particles and rodlike liquid crystalline polymers is modelled as a mixture of thick (colloidal) and thin (polymeric) hard rods. Extensive immiscibility in the fluid phase is observed in the mixtures. For two species of polymers, one species much longer than the...

  • Optimization of nano-emulsions production by microfluidization. Seid Jafari; Yinghe He; Bhesh Bhandari // European Food Research & Technology;Sep2007, Vol. 225 Issue 5/6, p733 

    Abstract  The purpose of this study was to produce an oil-in-water nano-emulsion with different compositions of the continuous and dispersed phases through microfluidization. The aqueous phase was a solution of maltodextrin with five different emulsifying ingredients including...

  • Two-bulb thermal separation factors of helium isotopes as a test of recent interatomic potentials. Taylor, William L. // Journal of Chemical Physics;6/1/1988, Vol. 88 Issue 11, p7097 

    New measurements on the thermal diffusion factor of the 3He–4He system are reported. The two-bulb method was used to measure αT in the temperature range 2.45 to 50 K and employed an improved method to treat the experimentally determined separations. Five recently proposed...

  • A direct method of determining the water content in water-oil emulsions. Zhernovoi, A. // Chemistry & Technology of Fuels & Oils;Mar2006, Vol. 42 Issue 2, p142 

    Measurement of the volume of water precipitated from 100 ml of emulsion is proposed. Total precipitation takes place in several minutes due to the vertical movement of high-voltage electrodes. Under the effect of their field, the water drops enlarge and precipitate.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics