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Method for extracting caffeine from tea leaves by concentration and sublimation method

A technology for caffeine and tea, applied in the industrial field to achieve the effect of high extraction rate and high purity

Inactive Publication Date: 2014-12-31
卢仁华
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction method is to transfer the solution containing caffeine into another solution for purification and separation, but it will inevitably contain impurities in the solvent

Method used

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Examples

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Embodiment Construction

[0009] Using concentration and sublimation method to extract caffeine from tea leaves is carried out as follows.

[0010] 1. First use clean tea leaves or wash the tea leaves. Clean tea leaves are the most basic requirement for extracting pure caffeine.

[0011] 2. Mix the tea and water into a closed pressure cooker and cook. The best quality ratio of tea to water is 1:10. The pressure cooker for decoction heating should be equipped with a thermometer to ensure that the heating temperature cannot exceed 110 degrees Celsius. The decoction time is 30 minutes. The pressure cooker is continuously rolled during the decoction to keep the tea inside. The caffeine in it is fully dissolved.

[0012] 3. After the pressure cooker is removed from the heating furnace, the temperature is lowered, and the pressure cooker is continuously rolled during the temperature reduction.

[0013] 4. Separating the slag liquid of the tea liquid obtained by decoction and squeezing the tea dregs to separate the...

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Abstract

The invention relates to a method for extracting caffeine from tea leaves by a concentration and sublimation method. The method mainly comprises the following steps of 1, picking fresh tea leaves, and cleaning the tea leaves; 2, decocting the tea leaves in a closed high-pressure pot according to a ratio of 1:8; 3, cooling the high-pressure pot after the high-pressure pot is separated from a heating stove, and continuously rolling the high-pressure pot during cooling; 4, performing slag-liquid separation on a tea leaf decoction, and squeezing tea slag to separate tea liquid; 5, distilling the tea liquid obtained by separation and squeezing under the temperature of 50-60 DEG C to obtain concentrated liquid; 6, adding calcium hydroxide powder into the concentrated liquid, and stirring to paste; 7, heating a paste body at low temperature, and evaporating water to obtain a dry powdered body; 8, spreading the dry powdered body in a pot, buckling a metal funnel cover at the upper part of the pot, heating the pot body, and keeping the temperature at 110-120 DEG C; 9, cooling and taking down the funnel cover every ten minutes, and scraping off crystallized caffeine from the inner surface.

Description

Technical field [0001] The invention relates to a method for extracting a large amount of caffeine from ordinary tea, and belongs to the technical field of industry. Background technique [0002] Caffeine is an alkaloid that has an excitatory effect on the nerve center of animals. It is often used as a central nervous system stimulant. Many drugs contain caffeine. Caffeine is widely used in medicine as anesthetic, refreshing, and exciting drugs. The production of caffeine has important medical significance. Pure caffeine is a white powder or needle crystal at room temperature with the molecular formula C8H10N4O2. Caffeine is easily soluble in water, ethanol, and alkali salt solutions. Another of the biggest characteristics of caffeine is that it is easy to sublime. This feature is often used as a method for extracting caffeine from plants containing caffeine. [0003] Since caffeine is a chemical drug that has been identified by people, caffeine can also be obtained by the intera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D473/12
CPCC07D473/12
Inventor 卢仁华
Owner 卢仁华
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