ESPECIALLY PURE ARSENIC ACID PRODUCTION PROCESS Russian patent published in 2006 - IPC C01G28/00 

FIELD: industrial inorganic synthesis.

SUBSTANCE: invention relates to producing arsenic acid, which serves as starting material for obtaining pure arsenic-containing substances usable as chemical power sources as well as additive in optical glass manufacturing processes. Process of invention envisages oxidation and simultaneously hydrolysis of tri-lower alkyl arsenites of general formula (RO)₃As (R = Me, Et, Pr) with aqueous hydrogen peroxide solution at 10 to 50°C and (RO)₃As/H₂O₂ molar ratio 1:(1-3). Resulting reaction mass is distilled to remove alcohol water. Commercial especially pure arsenic acid is obtained after evaporation of its solution.

EFFECT: increased yield of especially pure arsenic acid, simplified production process, and increased reliability thereof.

3 cl, 5 ex