Technique for producing tannin by using Chinese gall
A gallic and tannic acid technology, applied in the direction of preparation of sugar derivatives, sugar derivatives, esterified saccharides, etc.
Inactive Publication Date: 2005-10-26
竹山林产化工实业有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to provide a kind of technology that utilizes gallnut to manufacture tannic acid, solve the problem that non-tannin substances such as gum and pectin contained in gallnut are also extracted into the extraction solution simultaneously when high-temperature leaching, the present invention A kind of technology that utilizes gallnut to manufacture tannic acid is that gallnut is screened, broken into granules, granule puffing processing, leaching, concentration, drying; It is characterized in that, the gallnut after puffing is in normal temperature environment during leaching, and temperature is controlled at The effect is better at 15°C to 25°C, the liquid ratio is controlled at 1:7, divided into four times, each time for 30 minutes, all the tannic acid in gallnut can be extracted, and the non-tannin substances will be left in the waste residue
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Embodiment Construction
[0004] A method for producing tannic acid from Galla galla in the present invention is to screen and break Galla galla and then clean them up, and then put the particles broken into 1 mm to 4 mm into an extruder for expansion, and the temperature of the expanded galla gall is controlled at 15° C. to 15° C. during extraction. 25°C, the liquid ratio is controlled at 1:7, divided into four times, each time for 30 minutes, all the tannic acid in the gallnut can be extracted, and the non-tannin substances are left in the waste residue; Nitric acid is concentrated and dried to make finished products.
[0005] sample
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The present invention is aimed at providing a process for preparing tannic acid by utilizing sumac gallnut. Said process includes the following steps: screening, breaking, puffing, extracting, concentrating and drying, and is characterized by that after the puffing step said invention adopts a low-temperature quick extraction process so as to implement the goal of raising tannic acid quality. Said invention also provides the concrete steps of said low-temperature quick extraction process.
Description
Technical field: [0001] The invention relates to a process technology for producing tannic acid. Background technique: [0002] Gallnut contains about 60% tannic acid, about 14% water, about 26% gum, pectin, cellulose, and gallic acid. Gallnut has a compact structure and is not easily soluble in water. Tannic acid is easily oxidized and the color becomes darker. Under high temperature, its aqueous solution is slowly hydrolyzed to form gallic acid. And non-tannin substances such as gum and pectin contained in Galla gall are also extracted into the extract solution at the same time during high-temperature extraction, thereby reducing the quality of tannic acid. The existing tannic acid production process of the enterprise is to extract gallnuts after screening, crushing, concentration, freeze sedimentation, ethyl acetate extraction, secondary concentration, drying, and finished products; in order to overcome the problem of gallnut structure compactness, the extraction In the...
Claims
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IPC IPC(8): C07H13/02
Inventor 张世勇郭元飞何敦涛
Owner 竹山林产化工实业有限公司