METHOD OF PRODUCING IRON (II) FUMARATE Russian patent published in 2009 - IPC C07F15/02 C07C51/41 C07C57/15 

FIELD: chemistry.

SUBSTANCE: iron (II) fumarate can be used in different fields of chemical practice, in analytical control and in scientific research, through direct reaction of iron with fumaric acid in the presence of a catalyst, where the catalyst used is molecular iodine in amount of 0.025 to 0.1 mol/kg of the initial load, iron is taken in large excess in form of shells on the entire height of the reactor, false bottom and blade mixer, as well as in form of crushed cast iron and(or) reduced iron powder, the liquid phase solvent used is butylacetate, in which iodine and fumaric acid are at least partially dissolved, where fumaric acid is taken in amount of 0.8 to 1.2 mol/kg of the initial load, loading is done in the sequence: glass beads, liquid phase solvent, fumaric acid, iodine, and then crushed cast iron and(or) reduced iron powder; the process is started at room temperature and is carried out in a vertical type bead mill with ratio of mass of beads to mass of crushed cast iron and(or) reduced iron powder equal to 4:1, at temperature ranging from 18 to 45°C while bubbling air with flow rate of 0.95 l/min-kg of the liquid phase and using forced cooling and controlling using a sampling method until complete exhaustion of the loaded acid for formation of salt, after which stirring and cooling are stopped, the reaction mixture is separated from glass beads and unreacted crushed cast iron and(or) reduced iron powder and filtered, the residue is washed with butylacetate and taken for recrystallisation, and the filtrate and washing butylacetate are returned to the repeated process. Amount of acid used in extracting the product (without loss during purification) ranges from 89 to 96.5%, which depends on conditions for carrying out the process.

EFFECT: improved method of producing said product.

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