Factors affecting broadband acoustic emission measurements of a hetrogeneous reaction

A. Nordon, Y. Carella, A. Gachagan, D. Littlejohn, G. Hayward

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Broadband acoustic emission signals were obtained by attaching a piezoelectric transducer, sensitive up to 750 kHz, to the external wall of a 1 L jacketed glass reactor. Measurements were acquired of itaconic acid particles mixing in toluene; the total area of the acoustic emission signal from 55-500 kHz increased when the particle concentration, particle size or stir rate were increased. Signals at frequencies above 200 kHz were less sensitive to changes in particle size than those at lower frequencies. From calculation of the area of the signal in the range 55-200 kHz as a percentage of the signal area over the range 55-500 kHz, for mixtures of different size ranges of itaconic acid, it was possible to obtain an estimate of the mean particle size of a mixture. The heterogeneous esterification reaction of itaconic acid and 1-butanol was monitored non-invasively. A decrease in the overall acoustic signal area between 60 and 500 kHz was observed as the reaction progressed. Particle size and concentration information were contained in the amplitude of the acoustic emission signal, while the emission frequency yielded information on changes in the mean particle size.
LanguageEnglish
Pages323-330
Number of pages7
JournalAnalyst
Volume131
Issue number2
DOIs
Publication statusPublished - 2006

Fingerprint

acoustic emission
Acoustic emissions
Particle Size
Acoustics
Particle size
particle size
Acids
1-Butanol
acid
Piezoelectric transducers
Esterification
Toluene
Transducers
Butenes
Glass
transducer
toluene
range size
acoustics
glass

Keywords

  • broadband
  • acoustics
  • chromatography
  • esterification
  • component analysis
  • signal processing
  • succinates
  • transducers

Cite this

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Factors affecting broadband acoustic emission measurements of a hetrogeneous reaction. / Nordon, A.; Carella, Y.; Gachagan, A.; Littlejohn, D.; Hayward, G.

In: Analyst, Vol. 131, No. 2, 2006, p. 323-330.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Nordon, A.

AU - Carella, Y.

AU - Gachagan, A.

AU - Littlejohn, D.

AU - Hayward, G.

PY - 2006

Y1 - 2006

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AB - Broadband acoustic emission signals were obtained by attaching a piezoelectric transducer, sensitive up to 750 kHz, to the external wall of a 1 L jacketed glass reactor. Measurements were acquired of itaconic acid particles mixing in toluene; the total area of the acoustic emission signal from 55-500 kHz increased when the particle concentration, particle size or stir rate were increased. Signals at frequencies above 200 kHz were less sensitive to changes in particle size than those at lower frequencies. From calculation of the area of the signal in the range 55-200 kHz as a percentage of the signal area over the range 55-500 kHz, for mixtures of different size ranges of itaconic acid, it was possible to obtain an estimate of the mean particle size of a mixture. The heterogeneous esterification reaction of itaconic acid and 1-butanol was monitored non-invasively. A decrease in the overall acoustic signal area between 60 and 500 kHz was observed as the reaction progressed. Particle size and concentration information were contained in the amplitude of the acoustic emission signal, while the emission frequency yielded information on changes in the mean particle size.

KW - broadband

KW - acoustics

KW - chromatography

KW - esterification

KW - component analysis

KW - signal processing

KW - succinates

KW - transducers

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