ACIDIC PHOSPHOROUS CONTAINING COMPLEX-FORMING REAGENT AND METHOD OF OBTAINING IT Russian patent published in 2008 - IPC C07F9/38 E21B43/22 

FIELD: chemistry.

SUBSTANCE: invention pertains to the chemistry of phosphorous organic compounds, and specifically to an acidic phosphorous containing complex-forming reagent, which can be used in the oil industry, heat energy, textile industry, production of mineral fertilizers and household chemistry, and to the method of obtaining it. The acidic phosphorous containing complex-forming reagent (conventional name "АФК-2") contains the following in mass %: acetoxyethylidenediphosphonic acid - 50-95 mass %, acetic acid - 50-5 mass %. The method of obtaining the composition involves adding phosphorous tri-chloride, acetic acid and water simultaneously to glacial acetic acid in molar ratios equal to 1:(4.5-5.5):(1.93-1.95), at temperature of 35-45°C with subsequent keeping of the reaction mixture at 110-120°C for a period of 2 hours and controlled distillation of acidic impurities to the required distillate volume.

EFFECT: simplification of the process of obtaining phosphorous containing complex-forming reagent and increasing its ecological safety with reduction on the quantity of wastes.

2 cl, 15 ex, 2 tbl