METHOD OF OBTAINING IRON BENZOATE (III) Russian patent published in 2008 - IPC C07C63/08 C07C51/41 

FIELD: chemistry.

SUBSTANCE: invention pertains to the improved method of obtaining iron benzoate (III) through interaction of crushed iron with an acid with sparging air as an oxidising agent with use of stimulating additives in the reactor with a high speed blade mixer, in which the liquid phase is in the form of a 3.5-3.9 mol/kg solution of benzoic acid in a mixture of dimethyl formamide and n-butyl alcohol in mass ratios 1:1-1:1.5, containing 0.03-0.07 mol/kg iodine as a stimulating additive, which is brought into intensive contact with the crushed iron in mass ratio 4.44:1. The process itself starts with preparation of a solution of benzoic acid and iodine in a solvent mixture and is put into a vertical bead mill with mass ratios of the liquid phase to the glass bead of 1:1 with sparging air at a rate of 0.3-0.5 l/min for 1 kg of the liquid phase and temperature between 70°C and 80°C, maintained through a liquid heating bath, until full expenditure of the loaded acid. Mixing is then stopped. The reaction mixture is separated from the glass beads and unreacted particles of iron by passing through a metallic net, located in the field of a magnet. Filtering is then carried out. The residue obtained at the filter is dried or heated for recrystallisation from acetone, and the filtrate is analysed for content of iron salts and is returned to the repeated process.

EFFECT: perfection of the method.

2 cl, 17 ex, 2 tbl