In addition, high selectivity of membranes ensures high levels of separation and purification.Membranes of chosen selectivity and permeability if integrated with conventional fermenters allow simultaneous production and purification of gluconic acid in the same unit.Several conventional downstream purification units may be eliminated in the membrane based processes results in compact design with reduce capital investment.Barring pervaporation, membrane based system involves no phase change resulting reduced energy consumption.During conventional fermentation process, the liquor containing only sodium gluconate after removing the cells by centrifugation and decolourised by activated carbon can be directly spray dried to get the technical grade sodium gluconate.