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Taking a rotary evaporator as an example, the rotary evaporator is mainly composed of a main machine, a glass part, a constant temperature lifting bath, etc., and is mainly used for concentration, crystallization, drying, separation and solvent recovery in the pharmaceutical, chemical and biopharmaceutical industries.
Under vacuum conditions, the rotary evaporator bath is heated at a constant temperature, and the rotating bottle is rotated at a constant speed to form a large-area film on the bottle wall, and the solvent in the material is evaporated. The solvent vapor is cooled by a glass condenser and recovered in a collection bottle, which greatly improves the evaporation efficiency.
"Because the temperature of the water bath of the rotary evaporator is relatively low, it is particularly suitable for the concentration, crystallization, separation and recovery of the solvent, reflux extraction, etc. of the biological products which are easily decomposed and degenerated by high temperature." Rotary evaporator* said.
At present, the rotary evaporator can be used for the concentration of a traditional Chinese medicine extract, by heating the solution to vaporize it and removing part of the extraction solvent, and then increasing the concentration of the solute in the solution.
Rotary evaporator evaporation has a greater advantage than the general heat transfer process. For example, the boiling point of the solution is increased, and since the solution contains a non-volatile solute, the vapor pressure of the solution is smaller than that of the pure solvent at the same temperature.
For another example, the energy recovery evaporation process is a solvent vaporization process, and the energy consumption of the evaporation process is large due to the large latent heat of vaporization of the solvent. Therefore, energy saving is especially important in evaporation operations.
Although the rotary evaporator has great features and advantages in the application operation, for the maintenance of the rotary evaporator, the user should pay attention to the following points in daily operation:
First, before use, you should first check whether the equipment is damaged, whether the interfaces are consistent, and also pay attention to light handling; second, when cleaning, you can wipe each interface with a soft cloth or napkin, then apply a little vacuum grease. . The vacuum grease should be covered after use to prevent the entry of lime sand.
Third, the interfaces can't be tightened too tightly. It should be loosened regularly to avoid long-term tight lock and cause the connector to bite. Fourth, first turn on the power switch, then let the machine run from slow to fast, and stop the machine when it stops. Stop the state and turn off the switch.
Fifth, the PTFE switches everywhere can not be tightened too much, which is easy to damage the glass. Sixth, after using the equipment, wipe off all kinds of oil stains, stains and solvents left on the surface of the machine with a soft cloth. ,keep clean.
Seventh, after the shutdown, the polytetrafluoroethylene switches should be loosened, and the long-term static working state will deform the polytetrafluoroethylene piston . In addition, the seals should be cleaned regularly.
Specifically, it is necessary to remove the seal ring , check whether there is dirt on the shaft, wipe it with a soft cloth, then apply a little vacuum grease and reinstall it to keep the shaft and seal Ring smooth. Eighth, the electrical part cannot enter, and it is strictly forbidden to get wet.
Ninth, the user needs to purchase the original authentic accessories, and the use of other accessories will cause fatal damage to the machine. Tenth, when making any repairs or inspections on the machine, first cut off the power supply and water source, and indicate that the equipment belongs to For fragile products, please be careful when using the product. If the user finds a leak during use, it can be checked with phenolphthalein test paper, because ammonia is alkaline, and the phenolphthalein test paper will turn red.
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Rotary evaporator improves the evaporation efficiency of drug raw materials and reduces process energy consumption
According to the pressure in the evaporator, the evaporation equipment can be divided into a normal pressure evaporator, a pressure evaporator, and a vacuum evaporator (rotary evaporator); depending on the utilization of the secondary steam, the evaporation equipment can be divided into single-effect evaporation. And multi-effect evaporator; according to the type of evaporator, can be divided into circulating evaporator and single-pass evaporator.