Fig. 1

Conceptual process flow diagram of overall process showing sampling locations. Crude soluble xylo-oligosaccharides (XOS) from the reactor are first passed through a continuous microfiltration process (MF) to remove insoluble material. A series of proprietary chromatography columns are then used to remove color bodies and other impurities (CHROM). Low molecular weight impurities (organic acids and sugar monomers) are then removed via nanofiltration (F1). Next, high molecular weight impurities (very long oligomers) are removed by a second nanofiltration step (F2). Finally, diafiltration and dewatering is used to remove any final impurities and increase the solids concentration (F3)