METHOD FOR PREPARING CONCENTRATED IRON CHELATE SOLUTION AND IRON CHELATE Russian patent published in 2006 - IPC C07F15/02 C07C229/16 C07C227/16 C05D9/02 

FIELD: inorganic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing metal complex compounds, in particular, to iron complex (chelate) as its concentrated solution. Method is carried out by interaction of iron salt in an aqueous medium with a chelate-forming agent wherein N,N,N',N'-ethylenediaminetetraacetic acid is used as a chelating agent and citric acid that are added simultaneously or successively. The process is carried out at temperature 70-90°C and in the process of mixing iron salt or after mixing with chelate-forming agent an aqueous solution of ammonia or ammonium citrate is added for providing pH value of the end product 2.0-2.3. The complex-forming agent can comprise succinic acid additionally. Method provides preparing iron chelate as a concentrated solution with the content of iron 60-100 g/l. Invention can be used in agriculture for root and leaf feeding of plants.

EFFECT: improved preparing method.

4 cl, 6 ex