EKSTRAKSI ASAM SITRAT DAN ASAM OKSALAT : PENGARUH TRIOCTYLAMINE SEBAGAI EXTRACTING POWER DALAM BERBAGAI SOLVEN CAMPURAN TERHADAP KOEFISIEN DISTRIBUSI

Abstract

Generally, liquid waste of citric acid industry containing a highly citric acid, oxalic acid, due to precipitation process of calcium citrate less completely. Liquid-liquid extraction process is this one alternative that used to recover citric acid and oxalic acid, either in the product separation process from the fermentor or the treatment of its liquid waste. In order to understand, that the extraction process can be applied both technically and economically, it needs a more study the extraction parameters. The investigation has carried out about study of the extraction of citric acid and oxalic acid used trioctyl-amine as extracting power on various mix solvent and its ratio, related to the distribution coefficient. Extraction used a separating funnel that it was shaked with using an automatic shaker, which adjusted on specific velocity during 2.5 hours. The rafinate and extract were separated by separating funnel, then they were analyzed both concentration of citric acid and oxalic acid using a high performance liquid chromatography (HPLC). The results of the research show that the mixed solvent (consist of 15% trioctyl amine, 70% dodecane, and 15% hexanol), for the extraction of citric acid produce both the highest distribution coefficient and percentage of separation were 1.15 and 74.22%, respectively; and this were achieved for the ratio between the solvent and diluent of 2.5:1. For the extraction of oxalic acid similar result were obtained, and the value were 3.78 and 88.31%, respectively, for the ratio between solvent and diluent of 2:1.