Use of methylene phosphonic acid compositions derived from amino

Details Use of methylene phosphonic acid compositions derived from amino Use of methylene phosphonic acid compositions derived from amino

1985-02-01

1986-02-04

Wyse, Thomas

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

C02F 514

Patent

active

045684693

ABSTRACT:
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 ##STR1## wherein A is ##STR2## or X and wherein X is ##STR3## 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 ##STR4##

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patent: 3336221 (1967-08-01), Ralston
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patent: 3674804 (1972-07-01), Redmore
patent: 3743603 (1973-07-01), Redmore
patent: 3954761 (1976-05-01), Redmore
patent: 4051110 (1979-09-01), Quinlan
patent: 4055591 (1977-10-01), Scharf
patent: 4323461 (1982-04-01), Quinlan
patent: 4489203 (1984-12-01), Wilson et al.

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