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Instant black tea processing method

A processing method, instant black tea technology, applied in the direction of tea extraction, etc., can solve the problems of reduced purity of instant tea products, high production costs, affecting quality, etc., to achieve the effect of reducing the production of macromolecular substances, good quality, and improving clarity

Inactive Publication Date: 2016-09-28
南京融点食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that in the prior art, in order to convert green tea and oolong tea into instant black tea and improve the clarity and acid resistance of instant black tea, there is a method for oxidation by adjusting the pH value of tea water, but usually first adding alkali to improve the pH of tea water After the reaction is completed, acid is added to neutralize excess alkali to reduce the pH of tea water, resulting in the addition of more acid and alkali auxiliary materials, high production costs, and the final reduction in the purity of instant tea products, which affects the quality

Method used

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  • Instant black tea processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 1,000kg of green crushed tea, add 13,000kg of water, extract at 90°C for 30 minutes to obtain a green tea extract, and filter it through a disc separator and a ceramic membrane with a pore size of 500nm to obtain a clear and translucent filtrate. Concentrate the above filtrate in a vacuum The equipment is concentrated to obtain 1300kg of tea concentrate with a Brix sugar content of 20°. The above-mentioned green tea concentrate is equally divided into two parts for comparative experiments, each part of 650kg:

[0033] The first part directly added potassium hydroxide to adjust the pH value to 10. After standing for oxidation reaction at 70° C. for 45 minutes, added citric acid monohydrate to adjust the pH value to 5.5. After high-temperature sterilization and spray drying, 169.74 kg of instant black tea was obtained.

[0034] The second batch is divided into 5 batches, each batch is 130kg: the first batch is directly added potassium hydroxide to adjust the pH value ...

Embodiment 2

[0038] Take 400kg of crushed oolong tea, add 6000kg of water, extract at 93°C for 45 minutes to obtain the oolong tea extract, and filter it through a disc separator and a ceramic membrane with a pore size of 500nm to obtain a clear and translucent filtrate, and pass the above filtrate through a vacuum concentration equipment Concentrate to obtain 620kg of tea concentrate with a Brix sugar content of 18°, and divide the above-mentioned oolong tea concentrate into two parts for comparative experiments, each part of 310kg:

[0039] The first part directly added sodium hydroxide to adjust the pH value to 11. After standing for oxidation reaction at 80° C. for 60 minutes, added citric acid monohydrate to adjust the pH value to 5.8. After high-temperature sterilization and spray drying, 71.83 kg of instant black tea was obtained.

[0040] The second batch is divided into 5 batches, each batch is 62kg: the first batch is directly added with sodium hydroxide to adjust the pH value to ...

Embodiment 3

[0044] Take 400 kg of crushed black tea, add 8000 kg of water, and extract at 85°C for 60 minutes to obtain a black tea extract. After filtering through a disc separator and a ceramic membrane with a pore size of 500 nm, a clear and translucent filtrate is obtained. Concentrate through the osmotic membrane to obtain 1040kg of tea concentrate with a Brix sugar content of 10°. The above-mentioned black tea concentrate is equally divided into two parts for comparative experiments, each part of 520kg:

[0045] The first part directly added potassium hydroxide to adjust the pH value to 9.5, and after standing for oxidation reaction at 60° C. for 30 minutes, added citric acid monohydrate to adjust the pH value to 5.3. After high-temperature sterilization and freeze-drying, 67.5 kg of instant black tea was obtained.

[0046] The second batch is divided into 5 batches, each batch is 104kg: the first batch is directly added potassium hydroxide to adjust the pH value to 9.5, and the oxidat...

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Abstract

The invention discloses an instant black tea processing method. The method includes: adding water into tea leaves, and extracting; concentrating liquid obtained by solid-liquid separation; allowing concentrated liquor to pass through an electrodialysis concentration chamber to absorb alkali for increase a pH value; adding an appropriate amount of alkali to increase the pH value to a required value; standing for oxidization; after oxidation reaction is finished, removing excessive alkali through an electrodialysis desalination chamber to decrease the pH value of tea water to a required value; sterilizing and drying to obtain instant black tea. By means of electrodialysis, the alkali is absorbed from a last batch of tea water, then the appropriate amount of alkali is added to increase the pH value to the required value, and after oxidization is finished, the excessive alkali is removed by electrodialysis and supplied to a next batch of tea water to decrease the pH value to the required value, so that alkali recycling in the whole production process is realized, alkali consumption is substantially reduced, acid addition for neutralization of the excessive alkali is avoided, and production cost can be greatly reduced. In addition, due to reduction of added non-tea substances, the instant black tea is high in purity and excellent in quality.

Description

technical field [0001] The invention relates to a processing method of instant black tea, which belongs to the technical field of tea processing. Background technique [0002] Instant tea is generally made by extracting tea leaves with water, filtered or centrifuged, concentrated and dried. It is a solid powder that can quickly dissolve in water, has no tea residue and maintains the unique flavor of tea. It is generally processed by conventional processing methods. What kind of tea is it generally? What kind of instant tea is processed from raw materials, the clarity of the product is relatively poor after being dissolved in water. [0003] Chinese patent ZL01118460.4 discloses a cold-water-soluble acid-resistant instant black tea powder and its manufacturing method. Black tea leaves are soaked at 80-90°C, and the obtained tea extract is immediately cooled to room temperature, and then coarsely filtered and finely filtered. Finally, use membrane concentration or evaporation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/30
CPCA23F3/30
Inventor 钟亮岳鹏翔邵增琅唐杏燕王晓霞
Owner 南京融点食品科技有限公司
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