Gromwell haematochrome extracting process

A technology of comfrey pigment and extraction method, which is applied in the field of supercritical extraction, can solve problems such as the inability to separate comfrey pigment, and achieve the effects of high purity, high extraction rate and simple operation process

Inactive Publication Date: 2002-12-11
大连长青珍稀植物研究所 +2
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Problems solved by technology

But, as described in this instruction manual, the shikonin is almost insoluble in water, soluble in ethanol... In the method, edible alcohol of 35-70° is used as an entrainer, and it is mixed with a high ratio of 100:5 When the comfrey root is stirred, there will inevitably be a large amount of water, ethanol dissolved in comfrey and liquid carbon dioxide dissolved in comfrey in the separation tank. In this case, it is difficult to separate the comfrey of
In fact, only according to the method disclosed in the above-mentioned description: after separating the barfreshine into the product tank (how to separate it is not disclosed), the liquid carbon dioxide becomes gaseous through the heating device, and returns to the carbon dioxide storage tank through the carbon dioxide recovery tank..., is Inability to separate the purple purple pigment

Method used

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  • Gromwell haematochrome extracting process
  • Gromwell haematochrome extracting process

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Embodiment Construction

[0011] The specific implementation manner of the present invention will be described below with reference to the accompanying drawings. Such as figure 1 Shown: the pretreatment of raw materials is to cut comfrey roots into sections, and the source of gaseous carbon dioxide is a storage tank filled with gaseous carbon dioxide. Put the cut comfrey root into the extraction tank, adjust the pressure of the air compressor to 20-32Mpa, and turn the gaseous carbon dioxide into liquid carbon dioxide through the cooling device and enter the extraction tank. At this time, the liquid carbon dioxide will be the entrainer, purple The comfrey pigment in the grass root is dissolved in the liquid carbon dioxide to realize step a: using liquid carbon dioxide under a pressure of 20-32Mpa as an entraining agent to extract the comfrey pigment in the comfrey root. The remaining waste residue is discharged and can be used as feed. The liquid carbon dioxide dissolved with purple pigment enters the...

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Abstract

The extracting process of alkannin includes the following steps: extracting alkannin from gromwell by using liquid CO2 with 20-32 MPa pressure as entrainer; and sepg alkannin from liquid CO2 in the conditions of 15-20 MPa pressure and 30-40 deg.c temperature. The extracting process at special pressure and temperature is simple and has extracting yield as high as 1.6%. The product has high purity and no any residue.

Description

Technical field: [0001] The invention relates to a method for extracting shikonin from comfrey roots, in particular to a supercritical extraction method using carbon dioxide as an entraining agent. Background technique: [0002] Comfrey is an extract from the root of comfrey, and it is one of the five commonly used plant red pigments. It not only has the advantages of bright and pure color, but also has the characteristics of strong coloring power, penetration, heat resistance and light resistance. What is more prominent is that it also has various pharmacological properties such as sterilization, anti-inflammation, anti-virus, and promotion of granulation growth. Features. Therefore, comfrey has become the first choice among the five plant red pigments, and is widely used in cosmetics, colorants in the printing and dyeing industry, food additives and medicines. However, the methods disclosed so far for extracting comfrey from comfrey roots all have disadvantages such as l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 王锁春
Owner 大连长青珍稀植物研究所
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