Tea polyphenols are a collective term for polyphenolic compounds found in tea leaves and are among the important active constituents of tea. With the continued growth in demand for natural antioxidants, plant extracts, and functional ingredients, tea polyphenols have attracted widespread attention in the food, dietary supplement, pharmaceutical, and personal care industries.

So, how are tea polyphenols extracted, purified, and concentrated from tea leaves? And how should tea polyphenol extraction equipment be selected? Currently, there are three main extraction processes: solvent extraction, ion precipitation, and supercritical fluid extraction.

Comparison of Three Main Tea Polyphenol Extraction Processes

1.Solvent Extraction
Solvent extraction utilizes differences in the solubility of tea polyphenols, caffeine, and other substances in different solvents to achieve separation. An extractant is used to extract and purify tea polyphenols.

This process is relatively simple, delivers products with high purity, and is suitable for large-scale, continuous production. It is one of the widely used methods for tea polyphenol extraction and purification.

2.Ion Precipitation
In the ion precipitation method, tea leaves are first soaked and extracted with water. Metal ions are then introduced to form precipitates through complexation reactions with tea polyphenols. The precipitates are subsequently processed through centrifugation, solvent extraction, acidification, vacuum distillation, and vacuum drying to obtain products of relatively high purity.

This method does not require large quantities of organic solvents and offers advantages in production safety. However, pH adjustment during acid and alkali treatment can easily lead to the oxidation of tea polyphenols. In addition, the process generates relatively large amounts of wastewater and solid waste, placing greater demands on environmental protection and waste treatment.

3.Supercritical Fluid Extraction
Supercritical fluid extraction uses a supercritical fluid as the solvent and is considered an advanced separation method. It offers advantages such as easy recovery and energy savings.

However, this process generally requires low-temperature operation to prevent the oxidation of tea polyphenols. The entire process must also be maintained under supercritical conditions, resulting in higher equipment requirements and investment costs.

Overall, solvent extraction offers greater advantages in terms of product purity, process simplicity, and suitability for large-scale production. Within the solvent extraction process, the selection of liquid-liquid extraction equipment directly affects extraction efficiency, operational stability, and overall production costs.

The Key Role of the CWL-M Centrifugal Extractor in Tea Polyphenol Extraction

In the solvent extraction process for tea polyphenols, the key step is to achieve efficient transfer and separation of the target compounds from the aqueous phase to the organic phase. Traditional extraction equipment often suffers from slow phase separation, long residence times, a tendency toward emulsification, and low levels of automation. By intensifying mass transfer and phase separation through a centrifugal force field, centrifugal extractor can effectively address these challenges.

The CWL-M centrifugal extractor, developed and manufactured by Zhengzhou Tiei Extraction Technology Co., Ltd., serves as a core piece of liquid-liquid extraction equipment in tea polyphenol purification and concentration processes. By using a centrifugal force field to achieve rapid mixing and separation of the two phases, the equipment offers the following features:

1.Short stage residence time, reducing the risk of tea polyphenol oxidation during processing.
2.Rapid phase separation, accommodating extraction systems that are prone to emulsification or involve significant variations in phase ratios.
3.High extraction efficiency, helping improve tea polyphenol recovery and purity.
4.High efficiency and energy savings, making operating costs easier to control.
5.Simple maintenance and a high degree of automation, making the equipment suitable for continuous production.
6.Improved environmental performance, helping reduce solvent residues and the burden of wastewater treatment.

For tea polyphenol production lines, the CWL-M centrifugal extractor not only improves extraction-stage efficiency but also provides more stable feed conditions for subsequent concentration, drying, and other processing steps. This supports continuous purification and concentration from tea leaves to high-purity tea polyphenols.

From Laboratory Testing to Industrial Production

For customers who are still validating their tea polyphenol extraction processes, it is recommended to begin with small-scale trials using the CWL50-M laboratory centrifugal extractor. These trials can establish key process parameters, including phase ratio, number of stages, flow rate, and rotational speed, providing a reliable basis for selecting extraction and separation equipment for subsequent industrial-scale production.

After completing laboratory trials and process scale-up assessments, an appropriate CWL-M centrifugal extractor can be selected for industrial production based on processing capacity, the required number of extraction stages, material system, and automation requirements.

Zhengzhou Tiei Extraction Technology Co., Ltd. offers a complete product range, from laboratory equipment to industrial CWL-M centrifugal extractor, together with process support. We helps customers achieve continuous-process upgrades for tea polyphenol extraction, purification, and concentration.

Conclusion

From tea leaves to purified and concentrated tea polyphenols, the process route determines product purity and production costs, while the core extraction equipment determines whether the process can be scaled up reliably and operated stably. With its relatively simple process, high product purity, and suitability for large-scale production, solvent extraction remains an important route for tea polyphenol extraction. Featuring high efficiency, continuous operation, energy savings, and a high degree of automation, the CWL-M centrifugal extractor provides reliable equipment support for tea polyphenol extraction and purification.

For more detailed information on the CWL-M centrifugal extractor, please contact Zhengzhou Tiei Extraction Technology Co., Ltd. for further consultation.
Email: sales@tieiextraction.com
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