MANGANESE (II) FUMARATE SYNTHESIS METHOD Russian patent published in 2009 - IPC C07C57/15 C07C51/41 C07F13/00 

FIELD: chemistry.

SUBSTANCE: method of synthesis of manganese (II) fumarate through direct reaction of metal with acid is presented. The process is carried out in a vertical type bead mill with mass ratio of beads to the reaction mixture equal to 1:1, and the liquid phase is a solution of fumaric acid in an organic solvent with content of acid of 0.70-1.80 mol/kg. Manganese is taken in stoichiometric amount with acid or in deficiency of up to 5%. The process is started by loading the liquid phase solvent and acid and preparation of the acid solution in a bead mill, after which metal is loaded and the process is carried out at temperature ranging from 25 to 35°C while preventing spontaneous increase of temperature through forced cooling and controlling through sample taking and determination of manganese salt in the samples and residual amount of acid until attaining values close to calculated values during quantitative conversion of the reagent in deficiency. After that stirring and cooling are stopped. The suspension of the reaction mixture is separated from the glass beads, cooled to temperature between 5.2 and 6.2°C and filtered. The filtering residue is washed with the liquid phase solvent, cooled to approximately the same temperature, and taken for purification by recrystallisation. The filtrate and the washing solvent are returned to the repeated process.

EFFECT: method is easy to implement, the end product can be easily separated and there are no auxiliary materials which contaminate the obtained product.

2 cl, 11 ex