Sodium Gluconate (GS) Preparation Homogeneous Catalytic Oxidation Method and Sodium Hypochlorite Oxidation Method

(4) Homogeneous catalytic oxidation method

The homogeneous catalytic oxidation method mainly refers to the H ₂ O ₂ oxidation method, that is, the H ₂ O ₂ is used as an oxidant to oxidize glucose to gluconic acid under catalytic conditions

Wang Zumo et al.

(5) Sodium hypochlorite oxidation method

Sodium hypochlorite is used to oxidize glucose, and the by-product sodium chloride is separated by solvent extraction to prepare sodium gluconate .

①Prepare sodium hypochlorite by passing chlorine gas in liquid caustic soda

2NaOH+Cl ₂ =NaClO+NaCl+H ₂ O

②Sodium hypochlorite oxidizes glucose to produce sodium gluconate

CH ₂ (OH)[CH(OH)] ₄ CHO+NaClO+NaOH=CH ₂ (OH)[CH(OH)] ₄ COONa+NaCl+H ₂ O

③ Acidify the reaction solution with acid to convert sodium gluconate into gluconolactone

④Distilled water under reduced pressure, extracted with solvent, and neutralized the lactone with alkali to obtain sodium gluconate

(6) Electrolytic oxidation method

The electrolytic oxidation method is to add a certain concentration of glucose solution in an electrolytic cell, then add a suitable electrolyte, and perform constant current electrolysis at a certain temperature and a certain current density

Figure 6-4 Process flow of preparing sodium gluconate by electrolytic oxidation

Compared with other production methods, the electrolytic oxidation method has good product purity, up to 98%, and yield up to 90%.

Related Links: Preparation of Heterogeneous Catalytic Oxidation of Sodium Gluconate (GS)