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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

Inactive Publication Date: 2016-06-22
常州市鼎升环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The main technical problem to be solved by the present invention is that in the process of removing caffeine from tea leaves in the current traditional method, various nutritional components and The medicinal ingredients are lost, resulting in the waste of resources. A method is provided to extract tea leaves with ethanol, add slaked lime as a masking agent, and concentrate under reduced pressure to obtain a concentrated solution, and then put the obtained concentrated solution into an atomizing spray gun. Atomize and dry the fresh tea leaves so that the tea leaves are dry and turn yellow. Finally, soak the dry and yellow tea leaves in ethanol, and then immediately transfer them to hot water to release them. , so as to obtain the method of decaffeination in tea

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a method for decaffeinating tea leaves, which belongs to the technical field of caffeine decaffeination. In the present invention, the tea leaves are leached with ethanol, slaked lime is added as a masking agent, concentrated under reduced pressure to obtain a concentrated solution, and then the obtained concentrated solution is put into an atomizing spray gun, and the fresh tea leaves are targeted for atomization and drying treatment, so that the tea leaves are dried It is yellow, and finally put the dry and yellow tea leaves into ethanol to soak, then immediately transfer to hot water to release after soaking, and at the same time, pass carbon dioxide into the hot water, so as to obtain the method of decaffeination in tea leaves. Examples prove that the present invention is easy to operate, safe and reliable, not only does not use toxic solvents to separate caffeine from tea leaves, but also retains various nutritional and medicinal components such as tea polyphenols and tea pigments in tea leaves while separating , Finally, the caffeine content in the tea is reduced to below 1%.

Description

technical field [0001] The invention discloses a method for decaffeinating tea leaves, and belongs to the technical field of caffeine decaffeination. Background technique [0002] Tea has multiple functions such as anti-oxidation, anti-cancer, anti-radiation, lowering cholesterol, preventing arteriosclerosis, etc. It is one of the most popular beverages among consumers. However, because tea contains caffeine, an alkaloid that excites the brain and the heart, for some people with neurasthenia, pregnant women, children, and people with weakened heart function, drinking tea with high caffeine content for a long time may cause physical discomfort or other side effects. Low-caffeine tea is a product that can not only meet the demand of these consumer groups for drinking tea, but also avoid the adverse effects of high caffeine content in ordinary tea, and has a good market prospect. [0003] In the prior art, most methods of heating sublimation, organic solvent extraction, hot w...

Claims

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Application Information

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IPC IPC(8): A23F3/36
CPCA23F3/36
Inventor 许斌张帆
Owner 常州市鼎升环保科技有限公司
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