Synthesis Process Study Of β-Diketone Extractant

With the increasing depletion of copper resources, lean ore and oxidized copper mine in which the traditional copper smelting method can not fit, attracting the industry's attention. By Leaching-Solution eXtraction-ElectroWinning (L-SX-EW) copper hydrometallurgy process has the advantage of low cost, less energy consumption, simple process, and friendly environmental impact. Its proportion of the total copper production is increasing, and has a rapid growth trend in recent years.In the Leaching-Solution eXtraction-ElectroWinning process, the choice of extraction solvent is an important part. Different acidity of the leaching solution use different types of extractants. Extractant can be divided into oximes compound, P-diketone, ternary amine and other types,β-diketone extractant extraction copper from ammonia leaching solution, has the advantages of high selectivity and extraction capacity, does not extract ammonia, stripping fast, has a wide range of applications areas of recovery of copper, such as lean ore, circuit board scrap, PCB etching solution, electroplating solution. Representative product is the HENKEL company's LIX54 and LIX54-100.The extactant studied in this paperβ-diketone compound is 1-phenyl decane-1,3-dione. Used octanoic acid, sulfuric acid, methanol, sodium methoxide and acetophenone as the main raw materials, synthetic n-octyl ester, obtained 1-Phenyl decane-1.3-dione by Claisen condensation. After screening, the best conditions are:1. Esterification reaction:n (octanoic acid):n (methanol): n (toluene):n (sulfuric acid)=1:5:0.2:0.15; feeding three times; reaction time:18 hours; boiling reflux.2. Claisen condensation:n (acetophenone):n (n-octyl ester):n (methanol and sodium)= 1:1.10:1.16; using toluene as a solvent; nitrogen atmosphere; reaction temperature:110℃; the total reaction time:3 hours. Confirmed by GC-MS, the yield is more than 95%.