针对油酸提纯,设计薄层色谱展开剂比例的正交试验,优化了正己烷-乙酸乙酯-乙酸的体积比,采用相对标准偏差检验了薄层色谱法分离工业油酸的精密度。将展开剂的比例用作柱层析洗脱液,考察了硅胶装填高度、上样量对柱层析法分离油酸质量分...针对油酸提纯,设计薄层色谱展开剂比例的正交试验,优化了正己烷-乙酸乙酯-乙酸的体积比,采用相对标准偏差检验了薄层色谱法分离工业油酸的精密度。将展开剂的比例用作柱层析洗脱液,考察了硅胶装填高度、上样量对柱层析法分离油酸质量分数和收率的影响,确定柱层析分离过程条件。测试了层析柱循环使用的效果,为油酸提纯的工业化研究提供依据。结果表明:洗脱液正己烷-乙酸乙酯-乙酸的最佳体积比为85∶15∶8,方法稳定可靠;在硅胶的装填高度为40 cm,工业油酸的上样量为1.1 m L时,油酸的分离效果最好。在此条件下,油酸的质量分数达到88.74%,收率达到82.53%。展开更多
Wastewater containing high concentrations of phenol and sodium sulfate is generated in sebacic acid （SA） industry. Castor oil acid, a raw material for producing SA, can be used to extract phenol from wastewater in o...Wastewater containing high concentrations of phenol and sodium sulfate is generated in sebacic acid （SA） industry. Castor oil acid, a raw material for producing SA, can be used to extract phenol from wastewater in order to reduce the amount of phenol used in the process and discharge of phenol. The results show that the extrac- tion mechanism is that hydroxyl group of phenol is linked to carboxyl group of castor oil acid by hydrogen bond. The extraction process approaches equilibrium in 30 min. Extraction ratio increases with the increase of sodium sulfate and castor oil acid, and decreases as phenol increases. When the oil-water ratio is 1 ： 3, the optimal distribu- tion coefficient of 40 is obtained. Phenol saturation concentration in castor oil acid is 1.03 mol.L-1 after extraction for 4 times. The equilibrium constant （Kex） at 25℃ is 8.41 and the endothermic enthalpy （AH） is 1.513 kJ.mo1-1. The Gibbs free energy （AG） is -5.277 kJ. tool-1 and the value of AS is calculated to be 22.3 J. mo1-1. K-1.展开更多
文摘针对油酸提纯,设计薄层色谱展开剂比例的正交试验,优化了正己烷-乙酸乙酯-乙酸的体积比,采用相对标准偏差检验了薄层色谱法分离工业油酸的精密度。将展开剂的比例用作柱层析洗脱液,考察了硅胶装填高度、上样量对柱层析法分离油酸质量分数和收率的影响,确定柱层析分离过程条件。测试了层析柱循环使用的效果,为油酸提纯的工业化研究提供依据。结果表明:洗脱液正己烷-乙酸乙酯-乙酸的最佳体积比为85∶15∶8,方法稳定可靠;在硅胶的装填高度为40 cm,工业油酸的上样量为1.1 m L时,油酸的分离效果最好。在此条件下,油酸的质量分数达到88.74%,收率达到82.53%。
基金Supported by the National Natural Science Foundation of China （21006057） and the National Science Foundation for Post-doctoral Scientists of China （20100470351）.
文摘Wastewater containing high concentrations of phenol and sodium sulfate is generated in sebacic acid （SA） industry. Castor oil acid, a raw material for producing SA, can be used to extract phenol from wastewater in order to reduce the amount of phenol used in the process and discharge of phenol. The results show that the extrac- tion mechanism is that hydroxyl group of phenol is linked to carboxyl group of castor oil acid by hydrogen bond. The extraction process approaches equilibrium in 30 min. Extraction ratio increases with the increase of sodium sulfate and castor oil acid, and decreases as phenol increases. When the oil-water ratio is 1 ： 3, the optimal distribu- tion coefficient of 40 is obtained. Phenol saturation concentration in castor oil acid is 1.03 mol.L-1 after extraction for 4 times. The equilibrium constant （Kex） at 25℃ is 8.41 and the endothermic enthalpy （AH） is 1.513 kJ.mo1-1. The Gibbs free energy （AG） is -5.277 kJ. tool-1 and the value of AS is calculated to be 22.3 J. mo1-1. K-1.
