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Beverages 2017, 3(1), 12; doi:10.3390/beverages3010012

Comparative Study between Acoustic Emission Analysis and Immersion Bubble-Metric Technique, TGA and TD-GC/MS in View of the Characterization of Granular Activated Carbons Used in Rum Production

1
Faculty of Chemical Engineering, Energetic Efficiency Center, Universidad de Oriente, Santiago de Cuba 90500, Cuba
2
Faculty of Mechanical Engineering, Universidad de Oriente, Santiago de Cuba 90500, Cuba
3
Research group of Applied and Analytical Chemistry, Hasselt University, Agoralaan Building D, 3590 Diepenbeek, Belgium
4
Center of Digital Processing of Images and Signals (CENPIS), Universidad de Oriente, Santiago de Cuba 90500, Cuba
5
First Master of Cuban Rum, Santiago de Cuba 90500, Cuba
*
Author to whom correspondence should be addressed.
Academic Editor: Dimitrios Zabaras
Received: 4 November 2016 / Revised: 26 December 2016 / Accepted: 9 January 2017 / Published: 13 February 2017
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Abstract

Microscopic and acoustic emission analysis and sound patterns recognition techniques were applied for the characterization of granular activated carbon (GAC). A new and improved methodology has been developed to characterize the exhaustion degree of GAC used in rum production: (1) based on the acoustic emission analysis of the sound produced by water flooded on GAC; and (2) based on the microscopic analysis of bubbles formed by immersion into glycerol. Acoustic measurements are made in a specific set-up, bubble detection and analysis is performed using dedicated software developed in MATLAB® for circular shape pattern detection based on the Hough transform. Both have been correlated with data of GAC characteristics based on thermogravimetric analysis (TGA) and Thermal Desorption-Gas Chromatography Mass Spectrometry (TD-GC/MS). Eight samples of GAC used in the rum production, obtained at different depths within the fixed-bed filter, have been evaluated. Good correlations are found between the immersion “bubble-metric” technique and the acoustic measurement data from the original signal processed by Band-Pass (BP) filtering at 1.3 kHz and weight loss amounts of adsorbed compounds on the GAC. The found relationship gives the possibility to determine the exhaustion degree of GAC applying these methods and to evaluate high-porosity materials. View Full-Text
Keywords: activated carbon; acoustic emission; porosity; bubblemetry; TGA; TD-GC/MS activated carbon; acoustic emission; porosity; bubblemetry; TGA; TD-GC/MS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Crespo Sariol, H.; Mariño Peacok, T.; Yperman, J.; Sánchez Roca, Á.; Carvajal Fals, H.; Brito Sauvanell, Á.; Carleer, R.; Czech, J.; Ledea Vargas, J.R.; Navarro Campa, J. Comparative Study between Acoustic Emission Analysis and Immersion Bubble-Metric Technique, TGA and TD-GC/MS in View of the Characterization of Granular Activated Carbons Used in Rum Production. Beverages 2017, 3, 12.

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