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TitleUltrasonic pilot-scale reactor for enzymatic bleaching of cotton fabrics
Author(s)Gonçalves, Idalina
Herrero-Yniesta, Victor
Arce, Iratxe Perales
Castañeda, Monica Escrigas
Paulo, Artur Cavaco
Silva, Carla Manuela Pereira Marinho da
Pilot-scale reactor
Issue date2014
JournalUltrasonics Sonochemistry
CitationGonçalves, Idalina; Herrero-Yniesta, Victor; Arce, Iratxe Perales; Castañeda, Monica Escrigas; Paulo, Artur Cavaco; Silva, Carla, Ultrasonic pilot-scale reactor for enzymatic bleaching of cotton fabrics. Ultrasonics Sonochemistry, 21(4), 1535-1543, 2014
Abstract(s)The potential of ultrasound-assisted technology has been demonstrated by several laboratory scale studies. However, their successful industrial scaling-up is still a challenge due to the limited pilot and commercial sonochemical reactors. In this work, a pilot reactor for laccase-hydrogen peroxide cotton bleaching assisted by ultrasound was scaled-up. For this purpose, an existing dyeing machine was transformed and adapted by including piezoelectric ultrasonic devices. Laboratory experiments demonstrated that both low frequency, high power (22 kHz, 2100 W) and high frequency, low power ultrasounds (850 kHz, 400 W) were required to achieve satisfactory results. Standard half (4 g/L H2O2 at 90 ºC for 60 min.) and optical (8 g/L H2O2 at 103 ºC for 40 min.) cotton bleaching processes were used as references. Two sequential stages were established for cotton bleaching: (1) laccase pretreatment assisted by high frequency ultrasound (850 kHz, 400 W) and (2) bleaching using high power ultrasound (22 kHz, 2100 W). When compared with conventional methods, combined laccase-hydrogen peroxide cotton bleaching with ultrasound energy improved the whitening effectiveness. Subsequently, less energy (temperature) and chemicals (hydrogen peroxide) were needed for cotton bleaching thus resulting in costs reduction. This technology allowed the combination of enzyme and hydrogen peroxide treatment in a continuous process. The developed pilot-scale reactor offers an enhancement of the cotton bleaching process with lower environmental impact as well as a better performance of further finishing operations.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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