A kind of method adopting antifoaming agent to prepare gallic acid in liquid alkali hydrolysis
A technology of gallic acid and defoamer, applied in the field of gallic acid, can solve the problems affecting the production of gallic acid and the difficulty of wastewater treatment, and achieve the effects of alleviating the pressure of wastewater treatment, increasing production capacity, and reducing production costs
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Embodiment 1
[0017] Add 2000L of water to a 5000L enamel kettle with a reflux condenser, add 800kg of tara powder under mechanical stirring, add 640kg of liquid caustic soda, the mass fraction of liquid caustic soda is 30%, add 3.2kg of D240-01 defoamer, and control the reaction temperature at 90 -110oC, react for 1-2 hours, lower the temperature to 50-70oC, adjust the pH of the system to 1-3, add activated carbon with 5% water quality, control the temperature at 90-110oC for half an hour, heat filtration, obtain filtrate and filter residue; filtrate cooling and crystallization Obtain solid and liquid, dissolve the solid with hot water, add activated carbon for secondary adsorption decolorization, heat filter, filtrate crystallization suction filter, dry to obtain gallic acid.
[0018] The yield of crude gallic acid is 46.9%, which is equivalent to the yield of 47.1% by simple liquid alkali method. The salt content in the wastewater is 10.01%, which is 5.29% lower than the 15.3% salt conte...
Embodiment 2
[0020] Add 2000L of water to a 5000L enamel kettle with a reflux condenser, add 800kg of tara powder under mechanical stirring, add 640kg of liquid caustic soda, the mass fraction of liquid caustic soda is 30%, add 3.2kg of D240-02 defoamer, and control the reaction temperature at 90 -110oC, react for 1-2 hours, lower the temperature to 50-70oC, adjust the pH of the system to 1-3, add activated carbon with 5% water quality, control the temperature at 90-110oC for half an hour, heat filtration, obtain filtrate and filter residue; filtrate cooling and crystallization Obtain solid and liquid, dissolve the solid with hot water, add activated carbon for secondary adsorption decolorization, heat filter, filtrate crystallization suction filter, dry to obtain gallic acid.
[0021] The yield of crude gallic acid is 47.3%, which is equivalent to the yield of 47.1% by simple liquid alkali method. The salt content in the wastewater is 9.68%, which is 5.62% lower than the 15.3% salt conten...
Embodiment 3
[0023] Add 2000L of water to a 5000L enamel kettle with a reflux condenser, add 800kg of tara powder under mechanical stirring, add 640kg of liquid caustic soda, the mass fraction of liquid caustic soda is 30%, add 3.2kg of DF-102C defoamer, and control the reaction temperature at 90 -110oC, react for 1-2 hours, lower the temperature to 50-70oC, adjust the pH of the system to 1-3, add activated carbon with 5% water quality, control the temperature at 90-110oC for half an hour, heat filtration, obtain filtrate and filter residue; filtrate cooling and crystallization Obtain solid and liquid, dissolve the solid with hot water, add activated carbon for secondary adsorption decolorization, heat filter, filtrate crystallization suction filter, dry to obtain gallic acid.
[0024] The yield of crude gallic acid is 47.0%, which is equivalent to the yield of 47.1% by simple liquid alkali method. The salt content in the wastewater is 9.98%, which is 5.32% lower than the 15.3% salt conten...
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