Filtration problems caused by impurities in raw sugar are well known in the refining industry. Among the filter-impeding impurities are starch, dextran, gums, waxes, protein, phosphates, other polysaccharides and other micro particulates which result in turbidity. Some authorities believe that the filtration impeding effects of these matters are primarily caused by their size rather than their chemical nature. Filterability tests were performed at the SPRI laboratories, using a solution of various raw sugars at 55 brix, 70°C and CELITE 545 as a filtering aid. Filtration rate is defined as volume of solution collected in 35 minutes. Filtration rate was correlated to total polysaccharides, starch, dextran, turbidity, ash, color and pol. The results and conclusions are shown and the most significant correlations are discussed .
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