REAL TIME SOLUTION COLOUR OF CRYSTALLINE SUGAR

摘要

Solution colour is a very important quality property of sugar. Monitoring of sugar colour in real time permits tight control of the process and prevents shipment of sugar outside specifications. Colour determination by the laboratory ICUMSA methods have some drawbacks that can be compensated by in-line measurements in real time. Neltec has developed an instrument for this. The two methods will be compared. A description is given of the instrument's installation, function, applications, and performance with examples of installations on wet and dry sugar. Examples are presented of process optimisation and of detection of error conditions in the centrifugals. Calibration with measurements from the factory laboratory and the resulting accuracy will be discussed. Examples of the accuracy obtained in several installations will be presented. Comments on an eventual collaborative test of this indirect method are included.