Method for preparing gallic acid with tara powder

A technology of gallic acid and tara powder, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems such as economic loss, waste residue of tara powder has no recycling value, and large amount of acid and alkali, and achieve reduction Environmental pollution, improving comprehensive utilization, and reducing the effect of acid and alkali consumption

Inactive Publication Date: 2018-05-08
JIURUI BIOLOGY & CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process not only consumes a large amount of acid and alkali, but also takes a long time to react. At the same time, the waste residue of tara powder has no recycling value, which makes the comprehensive utilization rate of resources low, which not only causes economic losses, but also causes certain harm to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1t of tara powder to a 5t extraction tank, add 3t of water, and then extract three times at 40°C, each extraction time is 4 hours, and then collect the extract and tara powder waste residue separately, and the tara powder waste residue can be used to prepare organic Fat;

[0024] The extract obtained in the previous step is transferred into the concentration tank, and concentrated to 60% of the tannic acid concentration for use;

[0025] Put the concentrated solution of the previous step into a 3t reaction tank, then add 700L of 50% liquid caustic soda, then raise the temperature to 120°C, react for 1h under stirring, and then cool down to 60°C;

[0026] Add concentrated hydrochloric acid to the above reaction solution to adjust the pH value of the system to 1.5, then add 80kg of activated carbon, heat up to 100°C and keep stirring for 0.5h;

[0027] Filter the reaction solution in the previous step, and collect the reaction solution and activated carbon respective...

Embodiment 2

[0036] Add 1t of tara powder to a 5t extraction tank, add 3t of water, then extract three times at 20°C, each extraction time is 6 hours, and then collect the extract and waste residue of tara powder;

[0037] The extract obtained in the previous step is transferred into the concentration tank and concentrated to 45% of the concentration of tannic acid for use;

[0038] Put the concentrated solution of the previous step into a 3t reaction tank, then add 700L of 50% liquid caustic soda, then raise the temperature to 110°C, react for 1h under stirring, and then cool down to 60°C;

[0039] Add concentrated hydrochloric acid to the above reaction solution to adjust the pH value of the system to 1.5, then add 80kg of activated carbon, heat up to 100°C and keep stirring for 1 hour;

[0040] Filter the reaction solution in the previous step, and collect the reaction solution and activated carbon respectively;

[0041] The obtained reaction was transferred to a crystallizer for natur...

Embodiment 3

[0049] Add 1t of tara powder to a 5t extraction tank, add 3t of water, and then extract three times at 30°C, each extraction time is 5 hours, and then collect the extract and waste residue of tara powder;

[0050] The extract obtained in the previous step is transferred into a concentration tank and concentrated to 50% of the tannic acid concentration for use;

[0051] Put the concentrated solution of the previous step into a 3t reaction tank, then add 700L of 50% liquid caustic soda, then raise the temperature to 110°C, react for 1h under stirring, and then cool down to 60°C;

[0052] Add concentrated hydrochloric acid to the above reaction solution to adjust the pH value of the system to 1.5, then add 80kg of activated carbon, heat up to 100°C and keep stirring for 0.5h;

[0053] Filter the reaction solution in the previous step, and collect the reaction solution and activated carbon respectively;

[0054] The obtained reaction was transferred to a crystallizer for natural ...

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PUM

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Abstract

The invention discloses a method for preparing gallic acid with tara powder. The method comprises the following steps that the tara powder is extracted with water, and water extract is collected; water extract concentration is conducted; concentrated solution hydrolysis is conducted; gallic acid is refined. According to the method, by changing the original technology, the acid and alkali dosage islowered, and meanwhile tara powder residues discarded before can be used for preparing organic fertilizer, and the comprehensive utilization efficiency of resources is improved.

Description

technical field [0001] The invention relates to the technical field of gallic acid, in particular to a method for preparing gallic acid from tara powder. Background technique [0002] Tara is a precious economic plant distributed in Peru, Chile, Bolivia, Ecuador and other countries in South America. Tara bean shells contain 55-61% of Tara tannins, and are mainly used as a substitute for gallnuts to produce gallic acid. The current annual demand is more than 30,000 tons. [0003] At present, the preparation of gallic acid from tara powder mainly adopts the alkaline water method. The production process of this process is: add tara powder to water containing a certain amount of liquid alkali under stirring, and then heat it to 100-120°C for heat preservation reaction 2-4 hour, then lower the temperature to adjust the pH value of the system to 1-3, then add a certain amount of activated carbon, keep it warm for 0.5-1h, then filter with suction, collect the mother liquor, cool d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C65/03
CPCC07C51/42C07C65/03
Inventor 蔡明四杨彦明陈文斌陈波杨敏华
Owner JIURUI BIOLOGY & CHEM CO LTD
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