Compositions containing n-ethyl hydroxamic acid chelants

Details Compositions containing n-ethyl hydroxamic acid chelants Compositions containing n-ethyl hydroxamic acid chelants

1991-07-19

1992-12-29

Willis, Jr., Prince

Compositions

Physical separation agents

562621, 562622, 562623, 554111, 252180, 423112, C09K 300, C22B 5000

Patent

active

051749173

ABSTRACT:
N-ethyl hydroxamic acids, preferably containing at least 10 carbon atoms, useful as metal chelants for use in organic solvent extractant solutions such as kerosene to extract metals from aqueous solutions by forming complexes of the extracted metal with the N-ethyl hydroxamic acid. Metals can be stripped from complexes of N-ethyl hydroxamic acids at higher concentrations into lower strength acid stripping agents. The N-ethyl hydroxamic acid-containing organic solvent extraction solutions exhibit rapid phase separation from aqueous solutions and resistance to forming emulsions.

REFERENCES:
patent: 3821351 (1974-06-01), Lucid
patent: 4604407 (1986-08-01), Haslanger et al.
patent: 4741887 (1988-05-01), Coleman et al.
patent: 4874539 (1989-10-01), Huffman
patent: 4975253 (1990-12-01), Monzyk et al.
patent: 5030427 (1991-07-01), Monzyk

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