As a kind of high-efficiency evaporation equipment, falling film evaporator is widely used in industrial production. Especially in the field of traditional Chinese medicine extraction, falling film evaporator with its unique advantages, play an irreplaceable role. This article will introduce the falling film evaporator in the traditional Chinese medicine extraction product knowledge, to explore its working principle, application field, operation process and compared with other evaporator advantages.
The working principle of falling film evaporator
The working principle of falling film evaporator is relatively simple and efficient. Raw material liquid after preheating, from the top of the evaporator through the liquid distribution device uniformly into the tube. Under the action of gravity, the material liquid is film-like downstream along the inner wall of the tube, and is evaporated and concentrated. The gas-liquid mixture flows downward and enters the separation chamber from the bottom of the heating tube. In this process, the heat energy is transferred to the water inside the tube through the heat exchanger, so that the temperature of the outer wall of the tube rises. When the heat energy reaches the boiling point temperature, the liquid film begins to transform into vapor. The vapor is discharged from the top of the evaporator and can be collected or discharged after condensing through the condenser. Concentrate is collected through the collection tank, and can be further processed or discharged.
Falling film evaporator in Chinese medicine extraction application field
Evaporation and concentration
The solution containing non-volatile solutes and volatile solvents is evaporated and concentrated to obtain the concentrate or flow paste.
Heat-sensitive material processing
Continuous operation under vacuum and low temperature conditions to ensure that the material will not be denatured during evaporation to ensure the quality and safety of drugs.
Solvent Separation
Separation of chemical solvents to produce pharmaceutical products in a cost-effective manner.
Drug development and formulation
In the early stages of drug development and formulation, for concentration, crystallization, drying, separation and solvent recovery, to ensure the purity and effectiveness of drug compounds.
Falling film evaporator in traditional Chinese medicine extraction operation process
Extraction process: the Chinese herbal medicine will be immersed in the solvent for heating and extraction, including feeding, into the solvent, heating decoction, insulation and other steps.
Volatile oil collection: If it is necessary to collect the volatile oil produced when the herbs are decocted, the vapors will pass through the condenser and cooler to reach the oil-water separator to complete the collection of volatile oil.
Operation of falling film evaporator: raw material liquid is added from the top of heating tube, and flows down along the inner wall of the tube in the form of membrane under the effect of gravity, and is evaporated and concentrated. The top of each heating tube needs to be equipped with a liquid film clother to ensure that the solution can form a uniform film on the wall.
Evaporation and Concentration: It is suitable for low temperature evaporation and concentration of sensitive traditional Chinese medicine to ensure the sanitary and environmental protection requirements of the material, and at the same time reduce the evaporation temperature.
Automatic control: DCS system is adopted to automatically control the extraction production process, realizing the purposes of efficient production, reducing energy consumption and ensuring safety.
Linkage control of dregs discharge system: after the end of extraction, the dregs discharge system will linkage control to realize the automation of dregs discharge process.
Safety protection: real-time detection of the pressure of the extraction tank, when the pressure is too high can automatically shut down or adjust the flow of heating steam to achieve safety protection.
Falling film evaporator compared to other evaporator advantages
High efficiency and energy saving: because of its film formation makes heat transfer effect better, reduces the energy loss.
Ensure the quality of materials: in the process of evaporation of materials will not occur denaturation, to ensure that the traditional Chinese medicine extract of the "original flavor".
Adapt to high-viscosity materials: can evaporate viscosity, high concentration of materials, suitable for the concentration of traditional Chinese medicine extract.
High heat transfer efficiency: liquid in the falling-film evaporator inside the membrane flow, high heat transfer coefficient, and short residence time, not easy to occur material deterioration.
Low temperature difference evaporation: using low temperature difference evaporation is especially important for heat-sensitive materials.
Suitable for foaming material: no big impact will be formed in the concentration process, so no foam will be produced.
Stable operation: The film flow allows the liquid to be uniformly heated in the evaporator, making the operation more stable and reliable.
Saving space: falling film evaporator occupies small area, suitable for places with limited space.
Easy maintenance: simple structure, clear parts, easy to maintain and clean.
Reduce operation labor: single person can operate on site, and can also be controlled remotely.
Falling film evaporator in the extraction of traditional Chinese medicine can deal with high viscosity materials
Falling film evaporator is especially suitable for dealing with viscosity and heat-sensitive materials, such as Chinese medicine extract, glucose, fructose, milk, tomato juice, soybean milk, xylitol, sorbitol and starch sugar. These materials in the falling film evaporator can be in the lower heat transfer temperature difference to achieve effective heat transfer, to maintain the quality and activity of the material.
Falling film evaporator processing Chinese medicine extract concentration range
Falling film evaporator in the extraction of traditional Chinese medicine can be concentrated to a higher concentration of Chinese medicine extract. The specific concentration range that can be achieved is about 1.08 to 1.2g/ml, which depends on the specific material characteristics and process requirements. Through this efficient evaporation and concentration technology, the concentration of the herbal extract can be significantly increased while maintaining the quality and activity of the material.
Conclusion
With its unique working principle and significant advantages, falling film evaporator plays an increasingly important role in the field of traditional Chinese medicine extraction. It can not only improve the production efficiency and reduce the energy consumption, but also ensure the product quality and adapt to different physical properties and production requirements. With the continuous progress of technology and application expansion, falling film evaporator in the extraction of traditional Chinese medicine will have a broader future.