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Process and device for extracting citral from Litsea cubeba oil

A technology of litsea cubeba oil and citral, applied in the separation/purification of carbonyl compounds, organic chemistry, etc., can solve the problems of high impurity content, achieve high purity, short heating time, and uniform thickness

Inactive Publication Date: 2011-10-12
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the literature search, reports on the purification of citral from litsea cubeba oil by molecular distillation include: Purification of natural litsea cubeba oil by molecular distillation (Food Science and Technology, 2005.8), application research on purification of citral from litsea cubeba oil by short-path distillation (modern Chemical Industry, 2008.10), Chinese patent application CN101823942A, the methods disclosed in these documents are all single-stage molecular distillation, only the components with a lower boiling point than citral in litsea cubeba oil are separated, and the components with a higher boiling point than citral remain in the In the product, the impurity content in the product is still high

Method used

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  • Process and device for extracting citral from Litsea cubeba oil
  • Process and device for extracting citral from Litsea cubeba oil
  • Process and device for extracting citral from Litsea cubeba oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the device embodiment that extracts citral from litsea cubeba oil

[0020] refer to figure 1 , the present invention extracts the device embodiment of citral from litsea cubeba oil and comprises raw material tank 1, metering pump 2. Rotameter 3. Primary molecular still 4. Distillate intermediate storage tank 5. Distillate residue storage tank intermediate storage tank 6. Metering pump 7. Rotameter 8. Secondary molecular still 9, distillate storage tank 10, and distillate storage tank 11, vacuum system, heating system and cooling water system; in raw material tank 1 and rotameter 3 with metering pump 2. Metering pump The inlet of 2 is connected with the outlet of raw material tank 1, and the metering pump 2 outlets with rotameter 3 inlets connected, rotameter The outlet of 3 is connected with the inlet of the upper part of the primary molecular still 4, and the lower part of the primary molecular still has distillate and distilla...

Embodiment 2

[0027] The operating conditions of this example are: in the selected raw material Litsea cubeba oil, the mass fraction of citral is 70.2%, the primary distillation temperature is 40°C, the pressure is 100Pa, the secondary distillation temperature is 65°C, and the pressure is 1Pa. The mass fraction of citral discharged from the bottom of the secondary molecular still was 97.9%.

Embodiment 3~7

[0029] The process condition data of each step of Examples 3 to 6 and the mass fraction of citral in the product are shown in Table 1.

[0030] Table 1 The process conditions of each step in Examples 3 to 6 and the mass fraction of citral in the product

[0031]

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PUM

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Abstract

The invention relates to a process and device for extracting citral from Litsea cubeba oil. The process comprises the following steps: feeding Litsea cubeba oil into a first-grade molecular distiller for distillation so as to separate and remove components the boiling points of which are lower than the boiling point of citral; and feeding distilled residue into a second-grade distiller for separating and removing components the boiling points of which are higher than the boiling point of citral, and collecting distillate, namely the citral product. The device consists of a raw material tank, a rotameter, a metering pump, a molecular distiller, a storage tank, a vacuum system, a heating system and a cooling system. According to the invention, the citral product produced by the method has high purity and good quality, production process is easy to control, and cost is relatively low.

Description

technical field [0001] The invention relates to a process and device for extracting citral, in particular to a process and device for distilling and extracting citral from litsea cubeba oil. Background technique [0002] Litsea cubeba oil is an important variety of natural plant essential oils, in which the mass fraction of citral is 60%~80%, and the remaining 20%~40% components are mainly limonene monoterpenes, methyl heptenone, Linalool, citronellal, terpineol, geraniol, safrole, geranyl acetate, caryophyllene, etc. are the main raw materials for extracting citral. As the main fragrance and flavoring agent, citral is in great demand in daily and food flavors, and it is also widely used as a raw material for the synthesis of ionone, cyclocitral, damascenone series spices, vitamin A, vitamin E, and vitamin K . [0003] At present, the industrial separation and extraction of citral from litsea cubeba oil mainly includes the following methods: (1) chemical method: add sodium...

Claims

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Application Information

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IPC IPC(8): C07C47/21C07C45/82
Inventor 黎继烈蒋丽娟李忠海李昌珠肖志红朱晓媛郭璐罗倩
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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