Study on purifying high quality citral from Litsea cubeba oil
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摘要: 以山苍子油为研究对象,用GC-MS联用仪对山苍子油的重组分馏余物进行分析,用以香草醛为内标物的内标法对柠檬醛进行定量测定。采用分子蒸馏技术,先通过单因素试验,探讨蒸馏温度、蒸馏压力、物料流速对柠檬醛纯度及得率的影响。在此基础上,以柠檬醛纯度及得率的综合权重评分为指标,采用L9（34）正交试验,确定最佳水平组合。实验结果表明最佳工艺条件为:蒸馏温度55℃、蒸馏压力0.18k Pa、物料流速15m L/min,在此条件下,柠檬醛的纯度高达98.0%,得率高达77.2%。经中试试验验证,此最佳工艺条件可以运用到工业化生产中。Abstract: Taking the Litsea cubeba oil the research object, the heavy constituent residue fractionation of Litsea cubeba oil was analyzed by gas chromatography-mass spectrometry system (GC-MS) using vanillin as an internal standard to determined quantity of citral. The experiment explored the effect of distillation temperature, distillation pressure and material flow on citral purity and the yield rate molecular distillation technology by single factor experiment firstly. On the basis, the experiment applied L9 (34) orthogonal test with the comprehensive weight score of citral content and yield rate as the indicators to determine the optimal combination of three factors. The experimental results showed that the optimum conditions was 55℃ distillation temperature, 0.18 k Pa distillation pressure, 15 m L/min material flow with 1L inventory. Under this condition, the purity of citral was up to98% and the yield rate was up to 77.2%. The pilot test verified that this optimum conditions could be applied to industrial production.
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Keywords:
- citral /
- molecular distillation /
- Litsea cubeba /
- purification /
- internal standard method
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