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Method for distilling tannin from plant

A technology of plant tannin and extraction method, which is applied in chemical instruments and methods, preparation of organic compounds, sugar derivatives, etc., can solve the problems of failing to obtain pure plant tannin products, etc., so as to facilitate subsequent development, utilization and production. The effect of short cycle time and high yield

Inactive Publication Date: 2006-12-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But predecessors failed to recover the expensive Yb 3+ Recycling, unable to obtain pure vegetable tannin products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Grind and extract fresh or dried plant material in 7:3 acetone / water solution for 30 minutes, filter and wash the residue to obtain filtrate, and directly add quantitative amount of Yb to the filtrate 3+ , adjust the pH of the system through weak alkaline solutions such as ammonia water so that the tannins in it can be combined with Yb at a temperature of pH 7.0-7.3 and below 25 °C 3+ A flocculent precipitate is formed, and after 30 to 120 min, the precipitate is collected by centrifugation or filtration, washed three times with a 7:3 acetone solution, and washed twice with pure acetone. Disperse the precipitate in water to form a suspension, add oxalic acid solution to the suspension until the pH value is lower than 1.96, and fully react for 60-120 minutes to exchange the Yb in the precipitate 3+ , so that the tannin substance is re-dissolved, filtered or centrifuged to remove the ytterbium oxalate precipitate, and obtain a tannin solution, add calcium hydroxide to the...

Embodiment 2

[0030] Take 10g of dried casuarina bark, add 100mL of 7:3 acetone / water solution, grind and extract at room temperature for 30min, filter and wash the residue to obtain 250mL of filtrate, add 0.8g of Yb 3+ ytterbium acetate solution, the pH value of the reaction system was adjusted to 7.19 with ammonia water, and the precipitate was collected by centrifugation after reacting at 4°C for 45 minutes, washed with 7:3 acetone solution three times, and washed twice with pure acetone. Disperse the precipitate in 60 mL of deionized water, add 0.5 mol / L oxalic acid solution dropwise to the suspension until the pH of the system reaches 1.89, react at room temperature for 1 hour, and filter to obtain ytterbium oxalate precipitate and tannin solution containing oxalic acid. Add saturated calcium hydroxide solution to the tannin solution until the pH value of the system reaches 4.0, filter the tannin solution after reacting for 1 hour, evaporate a small amount of acetone remaining in the ta...

Embodiment 3

[0032] Take 20g of fresh Taiwan Acacia bark, add 150mL of 7:3 acetone / water solution, grind and extract at room temperature for 30min, filter and wash the residue to obtain 300mL of filtrate, add 1.0g of Yb3+ ytterbium trichloride solution, adjust the pH value of the reaction system to 7.23 with ammonia water, centrifuge to collect the precipitate after reacting at 4°C for 60 min, wash the precipitate three times with 7:3 acetone solution, and wash the precipitate twice with pure acetone. Disperse the precipitate in 80 mL of deionized water, add 0.5 mol / L oxalic acid solution dropwise to the suspension until the pH of the system reaches 1.90, react at room temperature for 1 hour, and filter to obtain ytterbium oxalate precipitate and a tannin solution containing a small amount of oxalic acid. Add saturated calcium hydroxide solution to the tannin solution until the pH value of the system reaches 4.1, filter the tannin solution after reacting for 1 hour, evaporate a small amount ...

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PUM

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Abstract

This is invention provides a method for extracting high purity plant tannin. The method comprises: (1) extracting plants containing tannin with acetone solution, and filtering to obtain the filtrate; (2) adding Yb3+ to the filtrate, reacting with tannin to form a precipitate, centrifuging or filtering to obtain the precipitate, washing, and dispersing in water to obtain a suspension; (3) adding oxalic acid solution to the suspension, reacting to exchange Yb3+ from the precipitate, stripping tannin, filtering or centrifuging to remove ytterbium oxalate precipitate and obtain tannin solution; (4) adding calcium hydroxide solution to the tannin solution to react with residual oxalic acid, filtering or centrifuging to remove calcium oxalate and obtain purified tannin solution, and drying to obtain high purified plant tannin product.

Description

technical field [0001] The invention relates to vegetable tannins, in particular to a method for extracting high-purity vegetable tannins. Background technique [0002] Plant tannin is widely distributed in leaves, bark, wood and fruit of plants, and is one of the objects of comprehensive utilization of forest resources. It is a secondary metabolite second only to cellulose, hemicellulose and lignin in content, and its content is more than 20% in the bark of mangrove plants, while the content in many coniferous barks is as high as 20% to 40%. In the world's approximately 340 billion cubic meters of forest resources, bark accounts for 10% to 15%, and the tannin resources in bark are measured in hundreds of millions of tons. At present, the world's annual output of tannin extract is about 500,000 to 600,000 tons, which is far less than 1% of the resources. The highest annual total output of tannin extract in my country once reached 50,300 tons. Due to changes in the interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G17/00C07G3/00C07C37/68C07H1/08C07G99/00
Inventor 林鹏向平林益明杨志伟何缘李敏
Owner XIAMEN UNIV
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