Methoden zur Bestimmung des Wassergehaltes der Produkte des Naßvermahlungsprozesses unter Berücksichtigung ihres Einflusses auf die Ausbeuteberechnung

Abstract

AbstractMethods for Determination of Water Content in Products of Wet Milling Process with Regard to their Influence on the Field Calculation. The Karl‐Fischer‐Titration (KF) of water as described is applicable to all products of wet‐milling processes. The water content of starch hydrolysates including dextrose may be determined in the same way if pyridine is used instead of methanol as extraction solvent. The results obtained by KF‐titration proved to be in sufficient accord with the determination of water content by the oven‐drying‐method at 105°C. The oven‐drying‐method at 130°C seemed to be less suitable because losses of nonaqueous volatile compounds particularly of raw materials are not to be avoided and therefore may effect the results. By this too low dry‐substances of raw materials are obtained, which result into high recoveries when the outputs of wet‐milling‐processes are calculated. The differences between the starch recoveries as obtained in laboratory scale proved to be relatively small (max. 0,6%), however they may be of some importance within the total balance of wet‐mills.