METHOD OF OBTAINING MONOETHANOLAMINE SALTS OF PHOSPHONIC ACIDS Russian patent published in 2014 - IPC C07F9/38 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method of obtaining salts of phosphonic acids with improved solubility in highly mineralised waters and water-organic solvents and can be applied in oil and gas industry, heat and power engineering, household chemicals and cleaning, construction, agriculture, food industry. Claimed method includes interaction of phosphonic acid or acidic salt of phosphonic acid with base in water solution, and as base used is monoethanolamine with the following mole ratio of reagents: phosphonic acid or acidic salt of phosphonic acid: monoethanolamine from 1:2 to 1:n, where n is basicity of phosphonic acid, and phosphonic acids are selected from nitrylotrimethylphosphonic acid with n equal 6, diethylenetriaminpentamethylphosphonic acid with n equal 10, 1-hydroxyethane-1,1-diphosphonic acid with n equal 4 and 2-phosphonobutane-1,2,4-carboxylic acid with n equal 5.

EFFECT: claimed is novel efficient method of obtaining salts of phosphonic acids with improved solubility.

2 cl, 8 ex, 3 tbl