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Technology of preparing 3,4-dihydroxybenzoic acid by using longan shells

A technology of protocatechuic acid and longan shell, which is applied in the field of preparing protocatechuic acid by using longan shell, can solve the problems of resource waste, environmental pollution, discarding and the like, and achieve the effect of reducing environmental pollution and resource waste.

Inactive Publication Date: 2017-10-20
广西高企科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a process for preparing protocatechuic acid by using longan shells to solve the problems of environmental pollution and waste of resources caused by longan shells except for a small amount used in traditional Chinese medicine, most of which are discarded unused

Method used

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  • Technology of preparing 3,4-dihydroxybenzoic acid by using longan shells
  • Technology of preparing 3,4-dihydroxybenzoic acid by using longan shells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of technology that utilizes longan shell to prepare protocatechuic acid comprises the following steps:

[0036] S1: crushing longan shells and passing through a 60-mesh sieve to obtain longan shell powder;

[0037] S2: Weigh 85 parts of the longan shell powder prepared in step S1, use low-temperature liquid nitrogen beating technology, and beat at a temperature of -12°C to obtain a longan shell slurry, and mix the longan shell slurry with 14 parts of 1-allyl- 3-Methylimidazole chloride and 25 parts of 1-ethyl-3-methylimidazole acetate were mixed evenly, put into an extraction bottle, and extracted for 1.5h under the conditions of ultrasonic power of 400W and temperature of 86°C to obtain Extraction solution, adjust the pH value of the extraction solution to 4.6, control the temperature at 50°C, decolorize and remove impurities by activated carbon for 1.3h, and obtain a decolorization solution after filtration;

[0038] S3: Concentrate and dry the primary decolor...

Embodiment 2

[0043] A kind of technology that utilizes longan shell to prepare protocatechuic acid comprises the following steps:

[0044] S1: crushing longan shells and passing through a 30-mesh sieve to obtain longan shell powder;

[0045] S2: Weigh 43 parts of longan shell powder prepared in step S1, use low-temperature liquid nitrogen beating technology, and beat at a temperature of -10°C to obtain longan shell slurry, mix longan shell slurry with 7 parts of 1-allyl- 3-Methylimidazole chloride and 15 parts of 1-ethyl-3-methylimidazole acetate were mixed evenly, put into an extraction bottle, and extracted for 1.6h at an ultrasonic power of 300W and a temperature of 76°C to obtain Extraction solution, adjust the pH value of the extraction solution to 4.2, control the temperature at 46°C, decolorize and remove impurities by activated carbon for 1.6h, and obtain a decolorization solution after filtration;

[0046] S3: Concentrate and dry the primary decolorization solution obtained in st...

Embodiment 3

[0051] A kind of technology that utilizes longan shell to prepare protocatechuic acid comprises the following steps:

[0052] S1: crushing the longan shell and passing through an 80-mesh sieve to obtain longan shell powder;

[0053] S2: Weigh 123 parts of longan shell powder prepared in step S1, use low-temperature liquid nitrogen beating technology, and beat at a temperature of -15°C to obtain longan shell slurry, mix longan shell slurry with 20 parts of 1-allyl- 3-Methylimidazole chloride and 30 parts of 1-ethyl-3-methylimidazole acetate were mixed evenly, put into an extraction bottle, and extracted for 1.2h at an ultrasonic power of 450W and a temperature of 92°C to obtain Extraction solution, adjust the pH value of the extraction solution to 5.3, control the temperature at 52°C, decolorize and remove impurities by activated carbon for 0.9h, and obtain a decolorization solution after filtration;

[0054] S3: Concentrate and dry the primary decolorization solution obtained...

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Abstract

The invention discloses a technology of preparing 3,4-dihydroxybenzoic acid by using longan shells, and belongs to the technical field of 3,4-dihydroxybenzoic acid preparation. The 3,4-dihydroxybenzoic acid is prepared by the following steps: crushing longan shells, performing ultrasonic extraction, performing first decoloration, performing coarse crystallization, performing second decoloration, performing separation and purification by a macroporous resin, performing concentration and crystallization, and performing drying. The 3,4-dihydroxybenzoic acid prepared by the technology provided by the invention has purity of 99.21% or above, and can be used as a qualitative or quantitative reference substance. The technology provided by the invention can effectively extract the 3,4-dihydroxybenzoic acid in the longan shells, and is beneficial for reducing environmental pollution and resource waste caused by longan shells.

Description

【Technical field】 [0001] The invention belongs to the technical field of protocatechuic acid preparation, and in particular relates to a process for preparing protocatechuic acid by using longan shells. 【Background technique】 [0002] 1-allyl-3-methylimidazole chloride and 1-ethyl-3-methylimidazolium acetate solution is a liquid composed entirely of anions and cations at room temperature or near room temperature, composed of specific, relative volumes Larger, structurally asymmetric organic cations and relatively smaller inorganic anions. In the above two ionic compounds, the force between anion and cation is Coulomb force, and its magnitude is related to the charge quantity and radius of the anion and cation. The larger the ionic radius, the smaller the force between them, so that the melting point is close to room temperature. Because 1-allyl-3-methylimidazole chloride and 1-ethyl-3-methylimidazole acetate have many advantages that traditional solvents cannot match, they ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C65/03
Inventor 石东秀
Owner 广西高企科技有限公司
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