Apparatus for separating gamma-terpinene paracymene with eucalyptus oil falling film type fractionating column

Abstract

The invention relates to a eucalyptus oil falling film-type fractionating tower, which is a device for separating Gamma-terpinene and P-cymene, and belongs to a fractionating tower for producing eucalyptus essential oil. A condensation return passage with the heat exchange area being 60 to 70 percent of the heating area is arranged on a total condenser on the top of a falling film tower and a return distributor on the top of the tower, namely, condensation passage pipe columns, which are same with the gas flow of the tower, are uniformly arranged on a pipe sheet tray, and the pipelaying area of the pipe columns accounts for 40 percent of the area of the tray. The invention keeps the prior processing conditions, reduces the volatilization of Gamma-terpinene and P-cymene, and improves the relative volatilities of the components of eucalyptus oil so that the content of primarily fractionated eucalyptol is more than 80 percent. High degree of separation is reached, and the cost is low. The eucalyptus oil falling film-type fractionating tower prevents material consumption resulting from newly added equipment, and turns to be efficient in production.

Description

technical field [0001] The invention belongs to a fractionation tower for producing eucalyptus essential oil. Background technique [0002] Eucalyptol is an important cyclic monoterpene oxide with a boiling point of 176°C. It is a colorless liquid at room temperature and has a strong cool aroma similar to camphor. Has antipyretic, antibacterial and anti-inflammatory effects. The content of eucalyptol in eucalyptus oil obtained from eucalyptus leaves through steam distillation is about 60%. Eucalyptus oil is exported as a raw material, and the content of eucalyptol needs to reach more than 80%. Usually, a rising film fractionation tower is used to obtain pure eucalyptus oil with more than 80% eucalyptol at one time. Due to the short maturity period of straight-dried eucalyptus, good wood and high oil yield, it has replaced pure eucalyptus as an important raw material for the production of eucalyptus oil in Yunnan since the late 1980s. The content of α-pinene in the eucaly...

AI Technical Summary

Problems solved by technology

The content of α-pinene in the eucalyptus crude oil distilled from straight-dried eucalyptus eucalyptus is significantly less than that of pure eucalyptus eucalyptus, while the content of γ-terpinene and p-cymene is significantly higher. During the fractionation process, with the change of the mole fraction in the gas-liquid components, the relative volatility difference of each component is too small, forming a system close to the constant boiling point, and the content of eucalyptol in one fractionation can only reach 76 %, it is difficult to obtain eucalyptus oil with a eucalyptol content of more than 80% at one time

[0003] To reduce the content of gamma-terpinene and p-cymene in the essential oil so that the content of eucalyptol reaches more than 80% at one time, or increase the number of plates to make the fractionation tower at least 1.5 times higher, that is, the original 6-meter tower section If it is increased to more than 15 meters, it will become a huge and complicated equipment; or use a super large reflux ratio to slowly cut off some head pinene, the time will be doubled, increasing energy consumption, reducing efficiency, and reducing aroma quality

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