Purification of 1,8-Cineole from Stock Solution of Eucalyptus Oil by Batch Vacuum Distillation

doi:10.7506/spkx1002-6630-201308005

Abstract

Abstract: Purification of 1,8-cineole from the stock solution produced from the industrial processing of raw eucalyptus oil was studied by batch vacuum distillation. The technique of tower packing pretreatment was selected based on effusing curves of the target 1,8-cineole as well as the main impurities of α-pinene, limonene and p-cymene in batch vacuum distillation. The effect of full-reflux time, pressure of operation system, and reflux ratio were investigated through singlefactor and response surface analysis experiments. The optimum conditions for recycling of 1,8-cineole from the stock solution were obtained as follows: (1) The tower was cleaned with ethanol, and then rinsed with water; (2) Under the pressure of 2.7 kPa, the stock solution was distilled initially in a full-reflux mode for 50 min and in a reflux ratio of 2:2. When the boiling point arrived at 60 ℃, the reflux ratio was adjusted from 2:2 to 10:1 and the fraction of 1,8-cineole was then collected within the boiling point range of 68 to 73 ℃. The purity of 1,8-cineole reached up to 85.1% confirmed by GC, and the recovery was 79.0%.

Key words: 1,8-cineole, stock solution, eucalyptus oil, batch vacuum distillation, response surface analysis

CLC Number:

TQ654

WANG Shi，JIN Lin-xi，XIE Jian-chun*，ZHENG Fu-ping，HUANG Ming-quan，SUN Bao-guo. Purification of 1,8-Cineole from Stock Solution of Eucalyptus Oil by Batch Vacuum Distillation[J]. FOOD SCIENCE, 2013, 34(8): 21-26.

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