Method for removing caffeine from tea leaves
A technology of caffeine and tea, which is applied in the field of decaffeination, can solve the problems of resource waste and loss, and achieve the effect of reducing waste
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example 1
[0023] First, take 500g of fresh tea leaves, after manual selection and removal of impurities, put them into clean water and scrub repeatedly to remove the residual mud on the surface of the tea leaves. Tumble once every 2 hours until the water content in the tea leaves is 2%; then pour the above-mentioned sun-dried tea leaves into a 2L beaker, and add an ethanol solution with a mass concentration of 75% twice the amount of tea leaves to it, mix well, and place In the ultrasonic oscillator, under the conditions of frequency 20KHz and power 100W, the ultrasonic oscillation reaction was performed for 1 hour. After the reaction was completed, the reactant was filtered to obtain the filtrate, which was placed in a Soxhlet extractor and extracted at room temperature for 45 minutes. Collect the filtrate extract, then move the obtained filtrate extract into a distillation device, heat to 75°C, and distill off ethanol to obtain a tea extract; then put the tea extract obtained above int...
example 2
[0026] First, take 550g of fresh tea leaves, after manual selection and removal of impurities, put them into clean water and scrub repeatedly to remove the residual mud on the surface of the tea leaves. Turn the sun once every 2 hours until the water content in the tea leaves is 2.5%; then pour the above-mentioned sun-dried tea leaves into a 2L beaker, and add an ethanol solution that is 2.5 times the quality of the tea leaves and has a mass concentration of 75% to it, mix well, and place In the ultrasonic oscillator, under the conditions of frequency 25KHz and power 130W, ultrasonic oscillation reaction was performed for 1.5h. After the reaction was completed, the reactant was filtered to obtain filtrate, which was put into a Soxhlet extractor and extracted at room temperature for 50min. , collect the filtrate extract, then move the obtained filtrate extract into a distillation device, heat to 70°C, and distill off ethanol to obtain a tea extract; then put the tea extract obta...
example 3
[0029] First, take 600g of fresh tea leaves, after manually picking and removing impurities, put them into clean water and scrub repeatedly to remove the residual mud on the surface of the tea leaves. Tumble once every 2 hours until the water content in the tea leaves is 3%; then pour the above-mentioned sun-dried tea leaves into a 2L beaker, and add an ethanol solution that is 3 times the mass of the tea leaves and has a mass concentration of 75% to it, mix well, and place In the ultrasonic oscillator, under the conditions of frequency 30KHz and power 150W, the ultrasonic oscillation reaction was performed for 2 hours. After the reaction was completed, the reactant was filtered to obtain the filtrate, which was placed in a Soxhlet extractor and extracted at room temperature for 55 minutes. Collect the filtrate extract, then transfer the obtained filtrate extract into a distillation device, heat to 85°C, and distill off ethanol to obtain a tea extract; then put the tea extract ...
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