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Application of the acid hydrolysis of sucrose as a temperature indicator in continuous thermal processes

1999Journal article Open access
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dc.contributor.authorTorres, A. Pinheiro
dc.contributor.authorOliveira, F. A. R.
dc.date.accessioned2011-10-22T11:44:59Z
dc.date.available2011-10-22T11:44:59Z
dc.date.issued1999
dc.description.abstractThe hydrolysis of sucrose in an acid medium was used as a temperature indicator to measure holding temperatures in a continuous thermal-processing unit. From a theoretical analysis, target conversion (χ) and errors in both acid concentration and conversion measurements were found to affect significantly the accuracy of predicted temperatures, whereas errors in the determination of the fluid mean residence time did not show a significant effect. For different pasteurisation temperatures (70°C < T < 86°C) and flow rates (4800< Re< 11,300), the acid concentration in the medium was adjusted so that different extents of reaction could be tested, as the reaction rate was found to increase exponentially with [H+]. Nitric acid solutions were circulated through the unit, a sucrose solution was continuously fed to the entrance of the holding tube and sucrose concentration was analysed at the half way part and at the exit of the holding tube. The temperature of the holding section was then estimated from the measured conversion. These results compared well with thermocouple measurements, with deviations of less than 4°C for conversions between 0.4 and 0.7, whereas greater errors were obtained for both low and high conversions.por
dc.identifier.citationTORRES, A. Pinheiro ; OLIVEIRA, F.A.R. - Application of the acid hydrolysis of sucrose as a temperature indicator in continuous thermal processes. Journal of Food Engineering. ISSN 0260-8774. Vol. 40, n.º 3 (1999), p. 181-188por
dc.identifier.doi10.1016/S0260-8774(99)00054-0
dc.identifier.urihttp://hdl.handle.net/10400.14/6799
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectHoldingpor
dc.subjectPasteurisationpor
dc.subjectTemperature Assessmentpor
dc.subjectTime-temperature indicatorpor
dc.titleApplication of the acid hydrolysis of sucrose as a temperature indicator in continuous thermal processespor
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspor
rcaap.typearticlepor

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