Faculty of Chemical Engineering, Ho Chi Minh City University of Food Industry.
Graduate School of Sustainable System Science, Osaka Metropolitan University.
J Oleo Sci. 2023;72(9):859-867. doi: 10.5650/jos.ess23045.
There are significant concerns regarding the quality of vegetable oils in the food and biofuel industries. In this study, we explored the preparation of high- quality oil from high-free fatty acid (FFA) vegetable oil using an ammonia/MeOH solvent as an alkali base. Among the six tested solvents, MeOH was the most suitable for the separation of the oil and FFAs. Among the three alkali bases, ammonia enhanced the miscibility of FFAs in MeOH by forming ammonium salts. The amounts of FFAs in the upper layer and oil in the lower layer were positively correlated (r = 0.9348 and 0.9617, respectively) with MeOH. With increasing MeOH concentration, the amount of oil in the lower layer increased along with the FFAs in the upper layer. Using the molar ratio of ammonia to FFA 1:1 and the ratio (v/w) of MeOH to oil 4:3, 91.6% FFAs and 97.8% oil in the upper and lower layers, respectively, were produced from 50% FFA oil. Using a relational expression of FFAs and oil in the upper layer, 97.1% FFAs and 99.6% oil in each layer was obtained from 10% FFA oil. The oil in the lower layer was further purified by extraction with MeOH. This method is easy and efficient for the separation and purification of oil, accompanied by the reuse of reagents with almost no loss of raw materials.
人们对食品和生物燃料工业中植物油的质量存在严重担忧。在这项研究中，我们探索了使用氨/甲醇溶剂作为碱基从高游离脂肪酸（FFA）植物油中制备高质量油的方法。在测试的六种溶剂中，甲醇最适合分离油和 FFAs。在三种碱中，氨通过形成铵盐增强了 FFAs 在甲醇中的混溶性。上层中 FFAs 的量与下层中油的量呈正相关（分别为 r = 0.9348 和 0.9617）与甲醇。随着甲醇浓度的增加，下层中油的量随着上层中 FFAs 的量增加。使用氨与 FFA 的摩尔比为 1:1，甲醇与油的体积比（v/w）为 4:3，从 50%FFA 油中可分别得到 91.6%的 FFAs 和 97.8%的油在上层和下层。使用上层中 FFAs 和油的关系式，可以从 10%FFA 油中得到 97.1%的 FFAs 和每层 99.6%的油。下层油通过用甲醇萃取进一步纯化。该方法简单高效，可用于油的分离和纯化，同时试剂可重复使用，几乎没有原料损失。
