| 摘要 |
<p>Novel modified and improved beta-diketones and their use in the extraction of copper from aqueous ammoniacal solutions containing copper values, resulting from commercial processes, including, but not limited to, leaching of copper containing ores, such as sulfidic ores, or concentrates resulting from flotation of such sulfidic ores. The novel diketones are those highly sterically hindered, which may be represented by formula (I) or (II) where in formula (I), R1 through R7 are the same or different, and are chosen from the group consisting of hydrogen, an aryl radical, an alkaryl radical containing from 6 to about 18 carbon atoms, and an alkyl radical containing from 1 to about 13 carbon atoms, with the provisos that (a) any two of R1 through R7 may together form a carbocyclic ring, (b) no more than four of R1 through R7 may be hydrogen, and (c) the overall molecule contains at least 14 carbon atoms. In formula (II), R is phenyl or alkyl substituted phenyl, R' is alkyl, and R'', R''' and R'''' are the same or different and are chosen from the group consisting of H, alkyl having from 1 to about 8 carbon atoms, and aralkyl having from 7 to about 14 carbon atoms, with the proviso that (a) no more than two of R'', R''' and R'''' are H and (b) the total number of carbons in all R groups is at least 13. The preferred beta-diketones of Formula (II) are selected from the group consisting of 1-phenyl-2-benzyl-3-isoheptyl-1,3-propanedione, 1-phenyl-2-methyl-3-isoheptyl-1,3-propanedione, 1-phenyl-4-ethyl-1,3-nonanedione and 1-phenyl-4,4-dimethyl-1,3-undecanedione.</p> |
