Use of methylene phosphonic acid compositions derived from aminohydrocarbyl piperazine-urea adducts to inhibit scale

摘要

Certain methylene phosphonic acid derivatives of aminohydrocarbyl piperazine-urea adducts are good threshold agents to prevent metal ion precipitation in aqueous solutions. These derivatives have the formula <IMAGE> wherein A is <IMAGE> or X and wherein X is <IMAGE> or H and wherein R is H, ammonium, an alkali or alkaline earth metal, m is 0-2, n is 2 or 3 and wherein at least one X is <IMAGE>