CN201276512Y - Apparatus for separating gamma-terpinene and p-cymene by eucalyptus oil climbing film fractionating tower - Google Patents

Abstract

The utility model belongs to a fractionation tower for producing eucalyptus essential oil. It sets a condensation reflux channel with a heat exchange area of 50-70% between the decondenser of the ordinary fractionation tower and the top of the fractionation tower, that is, uniformly arranges heat exchange tube bundles consistent with the gas flow direction of the tower on the tube plate tray. The pipe layout area is 35% of the tray area. The utility model maintains the original process conditions, reduces the volatilization of γ-terpinene and p-cymene, expands the relative volatility of each component in eucalyptus crude oil, and makes the content of eucalyptol in one fractionation reach more than 80%. , high separation, low cost, avoiding material consumption caused by new equipment, especially in production has achieved good results.

Description

A device for separating γ-terpinene and p-cymene in a rising film fractionation tower for eucalyptus oil

technical field

The utility model belongs to a rising film type fractionation tower for producing eucalyptus essential oil.

Background technique

Eucalyptus oil is a volatile oil obtained by steam distillation of eucalyptus leaves. 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 and cool aroma like camphor. Has antipyretic, antibacterial and anti-inflammatory effects. The eucalyptus oil currently produced in my country is generally exported as a raw material, and the main product is 80% eucalyptus oil. In addition to other physical and chemical indicators, the most important indicator is that the content of eucalyptol must reach more than 80%. Generally, the content of eucalyptol in eucalyptol oil obtained by distilling eucalyptus leaves is about 60%. Using the eucalyptus oil rising film fractionation tower heated by the current reboiler, the content of eucalyptol in pure eucalyptus oil is more than 80% at one time. It's not difficult. Due to the rapid growth of direct-dried Eucalyptus eucalyptus, good wood and high oil yield, it has replaced Eucalyptus orchid as an important raw material for the production of eucalyptus oil in Yunnan. In the eucalyptus crude oil distilled from straight-dried Eucalyptus orchids, α-pinene 11-13%, limonene 6-8%, eucalyptol 60-63%, γ-terpinene 3-5%, p- The content of cymene is 1.5-3%. Among them, the content of α-pinene is significantly less than that of pure Eucalyptus, while the content of γ-terpinene and p-cymene are greatly increased. In this change, the structure of γ-terpinene and p-cymene is similar to that of eucalyptol, the molecular weight is similar, and the difference in boiling point is small, which leads to the change of mole fraction in gas-liquid components during the fractionation process , the relative volatility difference of each component is too small, forming a system close to the constant boiling point, the eucalyptol content of one fractionation can only reach between 76% and 79%, and it is difficult to obtain a qualified product with 80% content at one time. To make the content of eucalyptol reach more than 80%, if it is solved according to the traditional method, or the number of trays is increased to increase the height of the fractionation tower by at least 1.5 times, even if the original 6-meter tower section is increased to more than 15 meters, it will become a huge and complicated equipment. ; Or use super large reflux ratio to slowly cut off some head pinenes, the time will be extended by about one time, which will increase energy consumption, reduce efficiency, and reduce aroma quality. At present, a commonly used method is to obtain The essential oil is fractionated again or infiltrated with pure eucalyptus fractionated essential oil.

Contents of the invention

The purpose of this utility model is to reduce the volatilization of γ-terpinene and cymene through a fractionation process while maintaining the original process conditions and basically without changing the original equipment, so as to expand the concentration of eucalyptus in the crude oil of straight eucalyptus orchids. The relative volatility of leaf elements can effectively increase the content of eucalyptol in essential oils.

The utility model is realized in the following ways:

(1) between the fractional condenser (105) and the fractionation tower top (108) of the fractionating tower, the heat exchange area is set to be the condensation reflux channel (107) of 50-70% cross-sectional area of the rising film reboiler (101), namely A heat exchange tube bundle (107-4) consistent with the gas flow direction of the tower is evenly arranged on the tube plate tray, and the tube layout area of the tube bundle (107-4) is 35% of the area of the tray;

(2) The connecting device between the condensing return channel (107) and the partial condenser (105) is a well-insulated empty tower section (106) with flanges welded at both ends and the height not lower than 50% of the tower diameter. .

25的管子数目为145～150根，同时管子的长度与塔径的比为1∶(1～1.2)。When the tower diameter is 500mm,

The number of 25 tubes is 145-150, and the ratio of the length of the tubes to the diameter of the tower is 1: (1-1.2).

The arrangement of the tube bundles on the tube sheet is an equilateral triangle, a square, or a concentric circle.

In the above method, because the general diameter is less than about 15% of the tower diameter channel, the pressure drop of the packed tower will obviously increase, so the pipe layout area of the utility model is not less than 35% of the tray area. Secondly, the heat exchange area is between 50-70% of the heating area, which can minimize the total resistance and pressure drop of the tower body and avoid the increase of energy consumption. Again, the channel of the device is too short to effectively convert energy to reduce the thermal movement of gas molecules of γ-terpinene and p-cymene; the channel of the device is too long, which will cause excessive cooling and bring unnecessary molecular components into the tower kettle. Therefore, we control the length of the device between 1:1 and 1.2.

The utility model has achieved good results in production. Practice has proved that: the device basically maintains the original process conditions, γ-terpinene and p-cymene are easy to be liquefied and enriched in this process, and the γ-terpinene and p-cymene are greatly reduced. The volatilization of most of γ-terpinene and p-cymene enriches the foot oil, expands the relative volatility of each component in the crude oil of Eucalyptus orchid, and makes the content of eucalyptol in the result of a fractionation Between 80% and 83%, the content of eucalyptol in the essential oil is effectively increased, and the first pass rate of the eucalyptus essential oil is guaranteed. Improve the efficiency of the eucalyptus oil fractionation tower, reduce the cost, reduce the energy consumption, ensure the aroma quality, and avoid the material consumption caused by equipment investment.

Description of drawings

Fig. 1 is the overall schematic diagram of the utility model. Including, eucalyptus oil evaporator 100, reboiler 101, packing and tower section 102, 103, reflux distributor 104, decondenser 105, empty tower section 106, condensate reflux channel 107, tower top and draft pipe 108 , Spiral plate condenser 109, serpentine condenser 110.

Fig. 2(a) is a structural diagram of the condensate return channel of the utility model.

(b) and (c) in Fig. 2 are respectively the top view of the condensate return channel and the top view of the empty tower section of the utility model. Among them, 107-1 is the equipment interface flange, 107-2 is the cooling water inlet, 107-3 is the condensed water outlet, 107-4 is the heat exchange tube bundle, 106 is the empty tower section, 106-1 is the empty tower section 106 The connection flange with the partial condenser 105.

Further description will be made below in conjunction with the accompanying drawings.

Detailed ways

25的管子作为换热管束107-4固定在管板上，管束107-4在管板上的排列方式为等边三角形。同时管子的长度与塔径的比为1∶1.2。管束107-4与塔内气体流向均为沿塔的纵向垂直，管束的布管面积为塔盘面积的35％。管板与壳体焊接在一起。Between the original fractionation tower decondenser 105 and the fractionation tower top, it is 50-70% condensing reflux channel 107 that the heat exchange area is fixedly installed, that is, the tube plate tray is installed on the tower diameter of 500mm, and 145

25 tubes are fixed on the tube sheet as a heat exchange tube bundle 107-4, and the arrangement of the tube bundle 107-4 on the tube sheet is an equilateral triangle. At the same time, the ratio of the length of the pipe to the diameter of the tower is 1:1.2. The tube bundle 107-4 is perpendicular to the gas flow in the tower along the longitudinal direction of the tower, and the pipe layout area of the tube bundle is 35% of the tray area. The tube sheet is welded to the shell.

The connecting device between the condensing return channel 107 and the decondenser 105 is a flange with the same welding height as the original tower at both ends and a well-insulated empty tower section 106 whose function is to re-inflate the rising gas. Balanced distribution, evenly delivered to the device for energy conversion. If there is no such device, it is easy to cause blockage of the original tower body channel.

Claims (3)

1. eucalyptus oil rises the device that the membrane type separation column separates γ-Song Youxi and Paracymene, comprises the partial condenser (105) of separation column, it is characterized in that:

(1) heat interchanging area is set for rising the condensing reflux passage (107) of film reboiler (101) sectional area 50-70% between partial condenser (105) and fractionation cat head (108), the heat-exchanging tube bundle (107-4) consistent with the gas flow of tower promptly evenly is set on the tube sheet tower tray, and the stringing area of tube bank (107-4) is 35% of a tray area;

(2) condensing reflux passage (107) is that two ends use the ring flange welding and assembling height identical with former tower to be not less than the good void tower joint (106) of 50% 1 insulation of tower diameter to partial condenser (105) intercommunicating device.

2. eucalyptus oil according to claim 1 rises the device that the membrane type separation column separates γ-Song Youxi and Paracymene, when it is characterized in that tower diameter is 500mm

Number of tubes be 145～150, simultaneously the length of pipe is 1 with the ratio of tower diameter: (1～1.2).

3. eucalyptus oil according to claim 1 rises the device that the membrane type separation column separates γ-Song Youxi and Paracymene, and the arrangement mode that it is characterized in that restraining on tube sheet is an equilateral triangle, square, or circular concentric.

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