| 摘要 |
<p>A process for the extraction of heavy metal ions capable of forming complexes with amines from dilute aqueous heavy metal salt solutions consisting essentially of the steps of A. DISSOLVING FROM 2% TO 15% BY WEIGHT, BASED ON THE WEIGHT OF THE DILUTE AQUEOUS HEAVY METAL SALT SOLUTION, OF AT LEAST ONE VICINAL AMINOALKANOL OF THE FORMULA <IMAGE> wherein R1 and R2 are unbranched alkyl having from 1 to 17 carbon atoms and the sum of the carbon atoms in R1 + R2 is from 7 to 18, A is a member selected from the group consisting of alkylene having from 2 to 6 carbon atoms and methylalkylene having from 3 to 7 carbon atoms, and y is an integer from 1 to 2, with the proviso that the vicinal substituents are distributed statistically, in a dilute aqueous heavy metal salt solution in the absence of organic solvents, at a temperature below the turbidity temperature of said vicinal aminoalkanols; B. HEATING THE SOLUTION TO A TEMPERATURE OF AT LEAST 10 DEG C above said turbidity temperature whereby two liquid phases are formed, and C. SEPARATING THE ORGANIC PHASE CONTAINING THE HEAVY METAL ION.</p> |
