IRON (II) OXALATE SYNTHESIS METHOD Russian patent published in 2009 - IPC C07C55/07 C07C51/41 C07F15/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing iron (II) oxalate by directly reacting metal with acid in the presence of atmospheric oxygen and a liquid phase while stirring. The process is carried out in a bead mill. The liquid phase solvent used is water with mass ratio of the liquid phase to glass beads equal to 1:1, content of oxalic acid in the initial load is between 0.5 and 2.0 mol/kg, and content of stimulating sodium chloride additive is between 0.02 and 0.10 mol/kg. Crushed grey cast iron which is stirred by a blade mixer is taken in amount of 30% of the mass of the rest of the load. The process is started and carried out at temperature in the interval from (50±2) to (93±2)°C while bubbling air under conditions for stabilising temperature using a heated liquid bath and controlling using a sample taking method and determination of content of iron (II) and (III) salts in the samples, and residual quantity of acid up to virtually complete conversion of the latter into salt. After that air bubbling, external heat supply for stabilising temperature and stirring are stopped. The suspension of the reaction mixture is separated from the glass beads and particles of unreacted metal alloy and filtered. The filtration residue is washed with distilled water and taken for further purification through recrystallisation, while the filtrate and the washing water are returned to the load for the repeated process. Iron (II) oxalate, which is separated from the reaction mixture by traditional filtering, is virtually the only product of conversion.

EFFECT: liquid phase used together with the sodium chloride additive can be repeatedly returned to the process.

10 ex, 1 tbl