Hydrazides of amino-polyacetic acids as chelants
AssigneeNuclear Technology Corporation
InventorsThomas D'Muhala, Robert Ward
Life of this patent
Estimating the term…
Abstract
Amino-polyacetic acids such as ethylenediaminetetraacetic acid, diethylene triaminepentaacetic acid and nitrilotriacetic acid are reacted with alkanols and then with hydrazine to form the hydrazides which may be converted to carboxyhydrazides, i.e. carbazic acids. The products perform well as chelants and sequestering agents.
Claims2
A process for dissolving calcium sulfate scale from an article on which it is deposited which comprises contacting said article with a composition comprising water and a hydrazide of an aminopolyacetic acid in an amount and for a time sufficient to dissolve the calcium sulfate scale.
A process for selectively sequestering nickel from a solution or scale containing a mixture of nickel and iron which comprises contacting said solution or scale with a composition comprising water and a hydrazide of an aminopolyacetic acid in an amount and for a time sufficient selectively to sequester or dissolve the nickel.
Dependencies are inferred from the claim text.