METHOD OF PREPARING AQUEOUS SOLUTION OF ZINC COMPLEX OF DISODIUM OR DIPOTASSIUM SALT OF HYDROXYETHYLIDENEDIPHOSPHONIC ACID Russian patent published in 2010 - IPC C07F9/38 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of preparing a zinc complex of disodium or dipotassium salt of hydroxyethylidenediphosphonic acid used as a salting and corrosion inhibitor, in agriculture, medicine and biology. The proposed method is realised using raw products in form of hydroxyethylidenediphosphonic acid, zinc oxide and sodium or potassium hydroxide and is distinguished by that, the raw products are mixed simultaneously while adding zinc oxide and sodium or potassium hydroxide to an aqueous solution of hydroxyethylidenephosponic acid in molar ratio equal to 1:2.2-2.6:1.1-1.3, after which the reaction mass is stirred until complete dissolution, cooled, filtering the residue and an aqueous solution of the zinc complex of disodium or dipotassium salt of hydroxyethylidenediphosphonic acid is obtained.

EFFECT: design of an improved method of preparing a zinc complex of disodium or dipotassium salt of hydroxyethylidenediphosphonic acid in form of an aqueous solution.

1 cl, 1 ex