Back to results
US 3,939,203 AGranted
Certain substituted 2-hydroxybenzophenoximes and the process of extracting copper therewith
AssigneeGeneral Mills, Inc.
InventorsPhillip L. Mattison, Ronald R. Swanson
Life of this patent
Estimating the term…
Abstract
Certain 2-hydroxy benzophenoximes containing an electron withdrawing substituent(s). Compositions comprised of such benzophenoximes and certain .alpha.-hydroxy aliphatic oximes. Compounds and compositions are useful for the extraction of metal values.
Claims8
A compound of the formula ##SPC6##
- in which R and R' may be individually alike or different and are saturated aliphatic hydrocarbon groups of 1-25 carbon atoms, E is an electron withdrawing substituent, p is 1, 2, 3 or 4, m is 0 or a whole integer up to 4-p and n is 0, 1, 2, 3 or 4, said compound having a total of 3-25 carbon atoms in R.sub.m and R'.sub.n and said electron withdrawing substituent E.sub.p (1) having an electron withdrawing capacity such that a phenol containing only said substituent has an acid ionization constant Ka of at least about 50 .times. 10.sup.-.sup.10 and (2) being so selected and positioned on the aromatic ring to substantially increase the efficiency of the compound as a copper extractant from aqueous solutions having a pH of less than about 1.0.
2-Hydroxy-3-nitro-5-dodecylbenzophenoxime.
2-Hydroxy-3-nitro-4'-isopropylbenzophenoxime.
2-Hydroxy-5-nitro-4'-isopropylbenzophenoxime.
2-Hydroxy-3-methyl-5-nitro-4'-dodecylbenzophenoxime.
Dependencies are inferred from the claim text.