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lh@wzlihong.com
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13857783528
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No. 168 Houzhang, Yongzhong Street, Longwan District, Wenzhou City
Wenzhou Lihong Machinery Technology Co., Ltd
Process principle of small multifunctional extraction tank
Date: 2025-04-10Read: 14
The process principle of the small multifunctional extraction tank is based on thermal reflux, forced circulation, and multi process adaptability design. It is suitable for various process requirements such as water extraction, alcohol extraction, and volatile oil extraction of traditional Chinese medicine. The specific process and principle are as follows:
1、 Basic Process Principles
1. Heat source control and circulation system
The boiling of the medicine solution is achieved inside the tank through a sandwich heat source (steam or electric heating). After boiling, the heat source is lowered to maintain a stable temperature, and cooling water is used to control the condensation and reflux of steam, forming a closed-loop cycle.
Forced circulation is used to extract the liquid medicine from the bottom of the tank through a pump and return it to the tank through the upper reflux port, eliminating local channeling and improving extraction efficiency.
3. Multi mode extraction process
Water extraction process: The mixture of medicinal herbs and water is heated to boiling in a tank, maintained for a certain period of time, and then the steam is cooled by a condenser to form a liquid state and reflux back into the tank, forming a dynamic equilibrium.
Alcohol extraction process: Alcohol and medicinal herbs are added under closed conditions, and the temperature is controlled by a heat source. The gaseous alcohol is liquefied by a condenser and refluxed, supplemented by pump circulation to accelerate dissolution.
Oil extraction process: The medicinal herbs containing volatile oil are mixed with water and heated to the volatilization temperature. The steam enters the oil-water separator and the volatile oil is recovered in layers by adjusting the valve.
2、 Key process steps
1. Dynamic concentration and solvent recovery
The extracted liquid is partially pumped into the concentration tank and concentrated under vacuum conditions (-0.05~-0.08 MPa). The resulting secondary steam is condensed and refluxed to the extraction tank as a new solvent, forming a continuous extraction concentration cycle.
When recovering organic solvents (such as ethanol), solvent recycling is achieved by heating, evaporating, and condensing for recovery.
2. Pressure difference and mixing optimization
A pressure difference is formed inside the tank through vacuum or pressurization to accelerate the dissolution of active ingredients; The stirring device prevents material clumping and promotes full contact between the solvent and the medicinal herbs.
3、 Equipment characteristics and auxiliary systems
1. Structural Design
The oil-water separator adopts an adjustable liquid level design to ensure continuous separation of volatile oil.
The slag outlet adopts pneumatic sealing and interlocking control to avoid leakage and ensure operational safety.
2. Process adaptability
Supports extraction under normal pressure, pressure, and negative pressure, adapting to the physicochemical properties of different medicinal herbs and solvents.
It can synchronously complete multi-step integrated operations such as extraction, concentration, and volatile oil recovery.
4、 Typical Process Flow Example
Water extraction concentration combination: medicinal herbs and solvents are heated for extraction → part of the medicine is extracted into a concentration tank → secondary steam condensation reflux → circulation until the extraction solution is colorless → concentration to the target concentration.
Alcohol extraction solvent recovery: Mixing and heating alcohol and medicinal herbs in a closed tank → condensation reflux → forced circulation by a pump → solvent recovery after extraction is complete.
Through the combination of the above principles and processes, this equipment achieves efficient extraction, energy conservation, environmental protection, and multi process compatibility, and is widely used in the industrial production of traditional Chinese medicine and plant active ingredients.
