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Process for producing gallic acid by hydrolyzing buffer solution

A gallic acid and production process technology, applied in the field of gallic acid production, can solve problems such as unstable product performance, achieve the effects of shortening the production cycle, mild reaction conditions, and reducing the loss of gallic acid

Inactive Publication Date: 2010-02-24
CHONGQING RUITONG BIO CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a gallic acid production technology that can improve the production quality of gallic acid, increase the yield, and solve the defect of unstable product performance in the prior art

Method used

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Embodiment Construction

[0011] A kind of buffer solution hydrolysis gallic acid production process of the present invention is characterized in that: comprise the following steps:

[0012] 9) 100kg gallnuts are pulverized;

[0013] 10) Add NaH to the enamel reactor 2 PO 4 solution;

[0014] 11) Add Galla powder while stirring, and stir evenly;

[0015] 12) Slowly add H 2 SO 4 Make the pH value 1-2; add steam 0.15MPA to heat up to 120°C, control and maintain the pH of the mixture = 1-2. The reaction time is 2-4 hours, cooling and crystallization after the reaction: filtration, dehydration, decolorization, filtration, crystallization , dehydration, and drying to obtain the finished product.

[0016] This method produces gallic acid crude product yield and is 58.4%, compared with the gallic acid crude product yield of sulfuric acid process, it is 55.2%, has improved by 3.2%; 44.9%, an improvement of 3.5%.

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Abstract

The invention discloses a process for producing gallic acid by hydrolyzing a buffer solution, which is characterized by comprising the following steps: (1) pulverizing nutgalls; (2) adding an NaH2PO4solution into an enameled reaction kettle; (3) adding nutgall powder to evenly mix under a mixing condition; (4) slowly adding H2SO4 to obtain a pH value of 1-2; adding steam of 0.15MPA to raise the temperature to 120 DEG C; regulating and maintaining the pH value of 1-2 and the reaction time of 2-4 hours of the mixture; cooling and crystallizing after the reaction; filtering; dehydrating; decolorizing to filter; crystallizing; dehydrating; drying; and obtaining a finished product. The process for producing gallic acid by hydrolyzing a buffer solution can effectively solve the problems of incorrect control, easily excessive hydrolyzation, carbonization and other impurities when pure concentrated sulfuric acid is hydrolyzed, greatly reduce active carbon quantity of later procedures, decolorizing time, production period, excessive solid hydrolyzation and gallic acid loss caused by active carbon adsorption, increase the yield of the gallic acid and reduce the production cost.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a technology for producing gallic acid with gallnuts as raw materials. Background technique [0002] The production of gallic acid by acid method and alkali method are the two most commonly used production methods at present. The acid method is to directly hydrolyze tannic acid in gallnuts with sulfuric acid. Good, but the product contains a small amount of sulfate ions, the production is not easy to control, and it is prone to excessive hydrolysis. The hydrolyzed gallic acid will be used to generate pyrogallic acid and other substances, resulting in increased solubility of gallic acid, dark color, and reduced yield. [0003] Alkali method: Sodium hydroxide is used to act on the tannic acid in gallnut, the product has low purity, weak gallic acid activity, easy to contain unhydrolyzed tannic acid, and there are many auxiliary equipment and long production cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C65/03C07C51/00
Inventor 任鹰
Owner CHONGQING RUITONG BIO CHEM
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