A method for preparing gallic acid by hydrolysis of hydrochloric acid
A technology of gallic acid and hydrochloric acid, applied in the preparation of carboxylate/lactone, organic chemistry, etc., can solve the problems of high raw material cost, high energy consumption, environmental pollution, etc., and achieve improved hydrolysis recovery rate, reduced consumption, and reduced cost effect
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Embodiment 1
[0022] Gallnuts from Duyun, Guizhou were selected as raw materials and ground into powder.
[0023] In the reaction kettle, add Galla gall powder 10g, and add hydrolyzate 40mL thereinto, the hydrolyzate is the hydrochloric acid solution that mass concentration is 0.1%, and temperature is 50 ℃. Adjust the pressure of the reactor to 0.002MPa, use a frequency of 5kHz, ultrasonically treat for 20min, and use a filter to separate the solid and liquid to obtain a primary liquid and a primary solid; cool and crystallize the primary liquid until the solid does not increase, and use a filter for secondary separation Separation of secondary solid and liquid to obtain secondary liquid and secondary solid; the secondary solid is dissolved in water at a temperature of 50°C, decolorized by activated carbon, recrystallized at a temperature of 10°C, and dried under a vacuum of 0.02MPa to obtain gall Acid 5.45g.
Embodiment 2
[0025] Gallnuts from Zunyi, Guizhou were selected as raw materials and ground into powder.
[0026] In the reaction kettle, 10 g gallnut powder was added, and 30 mL of a hydrolyzate was added thereto. The hydrolyzate was a hydrochloric acid solution with a mass concentration of 1%, and the temperature was 70° C. Adjust the pressure of the reaction kettle to 0.05MPa, use a frequency of 10kHz, and perform ultrasonic treatment for 80 minutes. Use a filter to separate the solid and liquid to obtain a primary liquid and a primary solid; Separation of secondary solid and liquid to obtain secondary liquid and secondary solid; the secondary solid is dissolved in water at a temperature of 60°C, decolorized by activated carbon, recrystallized at a temperature of 20°C, and dried under a vacuum of 0.08MPa to obtain gall Acid 5.12g.
Embodiment 3
[0028] Gallnuts along the river in Guizhou are selected as raw materials and ground into powder.
[0029] In the reaction kettle, 10 g of Galla gall powder was added, and 50 mL of a hydrolyzate was added thereto. The hydrolyzate was a hydrochloric acid solution with a mass concentration of 0.5%, and the temperature was 60° C. Adjust the pressure of the reactor to 0.03MPa, use a frequency of 7kHz, and ultrasonically treat for 50 minutes. Use a filter to separate the solid and liquid to obtain a primary liquid and a primary solid; cool and crystallize the primary liquid until the solid does not increase, and use a filter for secondary Separation of secondary solid and liquid to obtain secondary liquid and secondary solid; the secondary solid is dissolved in water at a temperature of 55°C, decolorized by activated carbon, recrystallized at a temperature of 15°C, dried under a vacuum of 0.06MPa, and gallium is obtained Acid 5.53g.
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