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Method for preparing high-purity tannic acid by utilizing tara

A technology of tannic acid and tara, which is applied in the field of tannic acid preparation, can solve the problems of high price, low output, high production cost, etc., and achieve significant economic benefits and reduce energy consumption of products

Inactive Publication Date: 2015-06-10
GUANGXI FORESTRY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, the raw materials used to produce high-purity tannic acid were mainly tripe and tannic acid. Due to the influence of geography and climate, the output of tripe and tannic acid was relatively small, so the price was relatively expensive (25,000-30,000 yuan / ton), and the production cost higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Air-dry Tara pods 300g (after removing impurities), add water for single-tank extraction (after the raw material is fully absorbed, the raw material is submerged in water, the weight ratio of raw material to water is about 1:3), leaching at a low temperature of 35-45°C, repeat 4 times (35°C for the first time, 40°C for the last time), 1.5 hours each time, combine the extracts and filter; add calcium hydroxide solution with a mass percentage concentration of 25% to the obtained Tara extracts, and keep stirring After the complexation is complete and the pH of the solution reaches 7.0, filter with filter paper; after dissolving the obtained filter cake with an appropriate amount of water, add sulfuric acid solution with a mass percentage concentration of 30% for reduction reaction, stir while adding, and wait until the reduction is sufficient, the solution After the pH reaches pH 3.5, filter; use a rotary evaporator to concentrate the resulting reducing solution into a thic...

Embodiment 2

[0014] Air-dry 500g of Tara bean pods (after removing impurities), add water for single-pot leaching (after the raw materials are fully absorbed, the raw materials are submerged in water, the weight ratio of raw materials to water is about 1:5), leaching at low temperature of 35-45 °C, repeat 5 times (40°C for the first time, 45°C for the last time), 2 hours each time, combine the extracts and filter; add the zinc hydroxide solution with a concentration of 30% by mass to the obtained Tara extracts, and keep stirring After the complexation is complete and the pH of the solution reaches 7.5, filter with filter paper; after dissolving the obtained filter cake with an appropriate amount of water, add an oxalic acid solution with a mass percentage concentration of 35% for reduction reaction, stir while adding, and wait until the reduction is sufficient, the solution After the pH reaches pH 3.0, filter; use a rotary evaporator to concentrate the obtained reducing solution into a thic...

Embodiment 3

[0016] Air-dry Tara pods 1000g (after removing impurities), add water for single-tank extraction (after the raw material is fully absorbed, the raw material is submerged in water, the weight ratio of raw material to water is about 1:4), low-temperature extraction at 35-45 °C, repeat 5 times (40°C for the first time, 45°C for the last time), 2 hours each time, combine the extracts and filter; add the zinc hydroxide solution with a concentration of 30% by mass to the obtained Tara extracts, and keep stirring After the complexation is complete and the pH of the solution reaches 7.3, filter with filter paper; after dissolving the obtained filter cake with an appropriate amount of water, add an oxalic acid solution with a mass percentage concentration of 40% for reduction reaction, stir while adding, and wait until the reduction is sufficient, the solution After the pH reaches pH 3.3, filter; use a rotary evaporator to concentrate the obtained reducing solution into a thick gum with...

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PUM

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Abstract

The invention discloses a method for preparing high-purity tannic acid by utilizing tara. The method disclosed by the invention is characterized in that good and inexpensive tara is taken as a raw material, principles that hydrolytic tannin can easily complex with metal ions to form sediments and dissolution is different under different solvent polarity conditions are utilized, and tannin is further extracted and purified by combining multiple purification processes such as a complexing reduction reaction and polarity extraction, so that high-purity edible tannic acid is obtained. The method disclosed by the invention overcomes the defects of the traditional freezing and ion exchange method of complex process, high energy consumption, low yield and high cost, the whole purification process of the method disclosed by the invention is carried out under the conditions of normal temperature and normal pressure, energy consumption of the tannic acid product is greatly reduced, consumption of the tara raw material for each ton of the tannic acid product is less than or equal to 2.5 tons, the method disclosed by the invention can be applied to industrialized production, and obvious benefit can be achieved. The tannic acid content (dry basis) of the high-purity edible tannic acid produced by the invention is more than or equal to 93.0%, and other indexes can meet or be above the edible tannic acid qualified product standard (LY / T1641-2005).

Description

technical field [0001] The invention relates to a method for preparing tannic acid, in particular to a method for preparing Tara high-purity tannic acid. Background technique [0002] Galla is a general term for certain aphids of the subfamily Pentaphyllidae of the family Gossypiaceae, which parasitize on the compound leaves of several trees of the family Anacardiaceae. It is a traditional Linte product integrating economic benefits, ecological benefits and social benefits in my country, and its output and quality have always ranked first in the world. It has a wide distribution range, and its main production areas are located in 19 provinces and regions in the north and south of the Yangtze River. Gallnuts are divided into three categories in terms of commodities: belly times, horn times and times of flowers. The traditional process of high-purity tannic acid mainly uses tripe and horn as raw materials, which are extracted with water, concentrated, extracted, frozen, ion-...

Claims

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Application Information

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IPC IPC(8): C07H13/08C07H1/08
Inventor 周丽珠曾永明常新民何春茂谷瑶李军集梁忠云秦荣秀
Owner GUANGXI FORESTRY RES INST