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Purification Tank

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Overview

A purification tank, also known as purification equipment, is designed to enhance the purity of materials by extracting effective substances, conducting extraction, purification, separation, and recovery processes. For this reason, it is also referred to as an extraction tank—these are different terms used in various industries, but they share similar functions and characteristics with extraction tanks, extraction equipment, percolation tanks, etc.

 

The purification tank can be applied in multiple technological operations for traditional Chinese medicine, food, and chemical industries, including normal-pressure extraction, water decoction, heating reflux, forced-circulation percolation, aromatic oil extraction, and organic solvent recovery. It boasts advantages such as high purification efficiency, high extraction rate, and convenient, quick, and safe operation.

Principles

Common Principles of Purification Tanks:

(1) Water Extraction:
Water and traditional Chinese medicine (TCM) are charged into the purification tank according to a specific process ratio. Steam is then supplied to the jacket. After the tank contents boil, steam supply is gradually reduced to maintain a gentle boil. The process is sustained for a specified time based on purification requirements, ensuring active ingredients in TCM, decoction pieces, or herbal medicines fully dissolve into water to guarantee extraction yield.

 

(2) Alcohol Extraction:
First, medicinal materials and alcohol/liquor are added to the tank according to a defined process ratio. The system is sealed, and steam is supplied to the jacket. When the tank reaches the required temperature, heat supply is reduced to maintain the temperature at the process-specified level for a set duration, ensuring active ingredients in TCM or decoction pieces fully dissolve into alcohol. Vaporized alcohol rises, is condensed by a condenser, cooled by a cooler, and 回流 (refluxed) as liquid alcohol for storage, to be reused after distillation purification. To improve efficiency, a pump can force circulation, drawing the liquid from the tank bottom and recycling it back to the top.

 

(3) Essential Oil Extraction:
TCM containing volatile oils and water are added to the purification tank according to a specific process ratio. Steam (for jacketed tanks) is supplied to the interlayer. Upon reaching the evaporation temperature of volatile components, steam input is adjusted, and the tank temperature is maintained for a specified time as per process requirements. Volatilized aromatic oils are cooled and recovered via a cooling system. The cooled liquid medicine is separated into heavy oil, light oil, and water by an oil-water separator.

Design Features

Quick-opening Safety Dregs Discharge Door

  • Operated by air cylinders and a control panel, the tank cover can be automatically opened/closed via the panel.
  • Equipped with 3 or 4 air cylinders and safety devices to prevent accidental operations, offering high safety coefficients, suitable for small and medium-sized dregs discharge doors.

2. Rotating Dregs Discharge Door

  • Enables fully automatic opening/closing of the tank cover, supporting high-temperature and high-pressure extraction.
  • The rotating structure can withstand up to 7Bar pressure, providing more options for extraction processes and adapting to special process requirements.
  • Features self-locking function to ensure no misalignment or displacement, enabling convenient material discharge.

3. Large-diameter Dregs Discharge Door

  • Adopts a large-diameter design for rapid and convenient dregs discharge, enhancing operational efficiency.

4. Material Characteristics

  • All parts of the purification equipment in contact with liquid medicine are made of 304/316L stainless steel, which is non-toxic, non-shedding, and highly corrosion-resistant.
  • This not only ensures the quality of traditional Chinese medicine products but also extends the equipment service life.

Basic Selection Parameters Table

Specification TC – 0.5 TC – 1.0 TC – 2.0 TC – 3.0 TC – 4.0 TC – 6.0 TC – 8.0 TC – 10
Effective Volume 500L 1000L 2000L 3000L 4000L 6000L 8000L 10000L
Designed Pressure Inside Tank 0.09Mpa (for all)
Designed Pressure of Jacket 0.3Mpa (for all)
Compressed Air Pressure 0.6 – 0.7Mpa (for all)
Diameter of Feeding Port (mm) 400 400 500 500
Heating Area (m²) 2.4 3.0 4.7 6.5 8 11 12 15
Condensation Area (m²) 3 4 6 8 12 15 20 30
Cooling Area (m²) 1 1.5 1.5 2 2 3
Diameter of Slag Discharge Door (mm) 600 800 800 1000 1000 1200 1400 1500
Heating Steam Pipe Port 20 25 32 40 40 50 50 65
Exhaust Pipe Port 50 65 80 100 125 150 150 150
Cooling Water Port 32 32 40 50 50 50 65 70

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