Electrosynthesis of sodium dithionite.

摘要

An aqueous sulfuric acid anolyte solution is circulated through the anode compartment (17) of an electrolytic cell (10), and an aqueous NaHSO3 catholyte solution is circulated through its cathode compartment (19), while maintaining an anolyte and catholyte temperature range of 20-25 DEG C, a catholyte pH range of 4.6 to 5.8, and a reduction potential of -1.25 to -1.50 V versus Ag DEG /AgCl, to produce an aqueous solution of Na2S2O4. Optimum pH is maintained by small additions of an alkali to the catholyte solution for electrolysis and solution stability.