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Method for extracting tannin by using eucalyptus barks

A technology of eucalyptus bark and extract, which is applied in the direction of organic chemistry, can solve the problems of eucalyptus bark not being used rationally, waste of land resources, short rotation period, etc., and achieve high-quality and cheap products, low production costs, and high efficiency. significant effect

Inactive Publication Date: 2012-11-07
梁锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Extremely short rotation period
[0010] When eucalyptus is used as wood or as paper, it is necessary to remove the eucalyptus bark. Today, when eucalyptus is widely used, a large amount of eucalyptus bark will be produced. These eucalyptus barks are usually considered waste and need to be resolved through waste treatment. There is no condition to solve the problem Yes, it can only be stacked, which wastes a lot of land resources
[0011] According to research and analysis, eucalyptus bark is rich in tannins, and a large amount of eucalyptus bark cannot be used rationally, which will undoubtedly cause huge economic waste

Method used

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  • Method for extracting tannin by using eucalyptus barks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, the present embodiment takes Eucalyptus bark as an example to analyze, and the steps for extracting tannin from Eucalyptus bark are as follows:

[0033] 1) After the eucalyptus bark is removed from impurities and dried, the eucalyptus bark is beaten into filaments with a crusher, with a size of about 25mm to 50mm, and 25mm is the best in this embodiment;

[0034] 2) Soak in hot water, put the broken eucalyptus bark into the tank, the tank in this example is a 20m3 metal tank, add water according to the solid-liquid mass ratio of 1:2, heat the temperature to 60°C, and heat for 2 Hour;

[0035] 3) Put the soaked bark granules into a Φ200L 3.5m screw extruder to lift and extrude, and use 60°C hot water to extract the tannin extract by single-slot extrusion elution;

[0036] 4) Sodium metabisulfite was added to the extract to activate it, and the concentrated solution obtained by concentration had a Baume degree of 14°Bé, and the solid extract was ...

Embodiment 2

[0040] like figure 1 As shown, the present embodiment takes the bark of Eucalyptus urophylla as an example to analyze, and the steps of extracting tannin from the bark of Eucalyptus urophylla are as follows:

[0041] 1) After the eucalyptus bark is removed from impurities and dried, the eucalyptus bark is beaten into filaments with a crusher, with a size of about 25mm to 50mm, and 30mm is the best in this embodiment;

[0042] 2) Soak in hot water, put the broken eucalyptus bark into the tank, the tank in this example is a 20m3 metal tank, add water according to the solid-liquid mass ratio of 1:3, heat the temperature to 70°C, and heat for 7 Hour;

[0043] 3) Put the soaked bark granules into a Φ200L 3.5m screw extruder to lift and extrude, and use 70°C hot water to extract the tannin extract by single-slot extrusion elution;

[0044] 4) Sodium metabisulfite was added to the extract to activate it, and the concentrated solution obtained by concentration had a Baume degree of ...

Embodiment 3

[0048] like figure 1 As shown, the present embodiment analyzes the blue eucalyptus bark as an example, and the steps for extracting tannin from the blue eucalyptus bark are as follows:

[0049] 1) After the eucalyptus bark is removed from impurities and dried, the eucalyptus bark is beaten into filaments with a crusher, with a size of about 25mm to 50mm, and 35mm is the best in this embodiment;

[0050] 2) Soak in hot water, put the broken eucalyptus bark into the tank, the tank in this example is a 20m3 metal tank, add water according to the solid-liquid mass ratio of 1:4, heat the temperature to 80°C, and the heating time is 12 Hour;

[0051] 3) Put the soaked bark particles into a Φ200L 3.5m screw extruder to lift and extrude, and use 80°C hot water to extract the tannin extract by single-slot extrusion elution;

[0052] 4) Sodium pyrosulfite was added to the extract to activate it, and the concentrated solution obtained by concentration had a Baume degree of 16°Bé, and t...

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Abstract

The invention relates to a method for extracting tannin by using eucalyptus barks, comprising the following steps of: (1) grinding the eucalyptus barks by using a grinder; (2) immersing in hot water, placing the grinded eucalyptus barks in a tank, adding water according to the solid-liquid mass ratio of 1:(2-7), and heating to the temperature of 60-100 DEG C for 2-24h; (3) extracting a tannin extracting solution from the immersed eucalyptus barks with the hot water at 60-100 DEG C; and (4) concentrating and drying the tannin extracting solution to obtain liquid tanning extract or solid tanning extract. In the invention, tannin is extracted from the eucalyptus barks with an effective method, and the extracted tannin has a high out-going degree and a higher economic value. By recycling the eucalyptus barks which are waste material originally, the invention not only solves the problem that the eucalyptus barks are difficult to process but also creates great economic benefits, thereby achieving two purposes with one method.

Description

technical field [0001] The present invention relates to the extraction of tannins, especially the method of extracting tannins from bark. Background technique [0002] Eucalyptus is the general term for species of Eucalyptus in the family Myrtaceae. Eucalyptus belongs to the genus Eucalyptus in the family Myrtaceae. It is native to Australia and is mainly planted in Yunnan, Guangdong, Guangxi and western Sichuan provinces in China. There are 5 varieties of blue eucalyptus, direct-dried blue eucalyptus, lemon eucalyptus, large-leaf eucalyptus and leaf-viewing eucalyptus eucalyptus. Eucalyptus oil (aromatic oil) can be extracted from eucalyptus leaves. The leaves and essential oils can be used as medicine. Eliminates phlegm and dispels wind. [0003] Eucalyptus features: [0004] 1. Fast growth. Eucalyptus is the fastest-growing tree species in the world. During the peak growing season, it can grow 3 centimeters in a day, 1 meter in a month, and 10 meters in a year. Brazil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07G99/00
Inventor 梁锋
Owner 梁锋