Rotary evaporator application areas and points of use
Rotary evaporator overview:
The rotary evaporator is an evaporation instrument widely used in laboratories for reflow operations, rapid evaporation of large amounts of solvent, concentration of minor components, and reaction processes requiring agitation. The system can seal the pressure to 400-600 mm Hg; the solvent in the distillation bottle is heated by a heating bath, the heating temperature can be close to the boiling point of the solvent; and the rotation can be performed at a speed of 50-160 rpm to form a solvent. The film increases the evaporation area. In addition, under the action of a high-efficiency cooler, the hot vapor can be quickly liquefied to accelerate the evaporation rate.
The main components of the rotary evaporator include:
Rotating the motor to drive the evaporation bottle containing the sample by the rotation of the motor;
The evaporation tube has two functions, firstly serving as a sample rotating support shaft, and secondly through the evaporation tube, the vacuum system sucks the sample;
a vacuum system for reducing the pressure of the rotary evaporator system;
a fluid heating pot, which is usually heated with water;
a condensing tube that condenses the sample using double serpentine condensation or other condensing agents such as dry ice or acetone;
The sample collection bottle is condensed and the sample is cooled and then passed to the collection bottle.
Mechanical or motor mechanisms are used to quickly lift the evaporation flask in the heating pot.
The rotary evaporator's vacuum system allows for a simple water immersion pump that is immersed in a cold water bath or a mechanical vacuum pump with a cooling tube. Evaporating and condensing glass components can be simple or complex, depending on the purpose of the distillation and the nature of the solvent to be distilled. Different commercial devices contain some basic features, and modern devices often add features such as digitally controlled vacuum pumps, digital display heating temperatures, and even steam temperatures.
Rotary evaporator application areas:
Rotary evaporator is an indispensable instrument for evaporation, concentration, crystallization, drying, separation and solvent recovery in scientific research and production processes in pharmaceutical, chemical and biological products industries. It is developed by applying vacuum vacuum condition, constant temperature heating and thin film evaporation.
Rotary evaporators are used in teaching experiments in the laboratory. It consists of an electric heating device, an evaporation bottle, and a collection bottle, and a bump is provided on the outer surface of the evaporation bottle. The utility model has the beneficial effects that: during the experiment, when the evaporation bottle is placed on the table top, it is not easy to roll, and is not easy to break, thereby reducing the experimental expenses of the school.
Rotary evaporator notes:
1. The glass parts should be handled gently and gently, and should be washed, dried or dried before loading.
2. Each grinding port, sealing surface sealing ring and joints need to be coated with a layer of vacuum grease before installation.
3. The heating tank must be filled with water before it is energized. It is not allowed to dry without water.
4. Must be screwed into the fuse hole to avoid damage to the flask.
5. If the vacuum pumping does not come up, check each joint, whether the interface seals the sealing ring, whether the sealing surface is effective, whether the vacuum grease between the main shaft and the sealing ring is coated with the vacuum pump and whether the glass tube is leaking or cracked, cracking, The phenomenon of damage.
Advantages and disadvantages of rotary evaporator:
Distillation of the sample can also be achieved using a standard distilled glass unit (without a rotating distillation unit) under the action of a vacuum pump, but the rotary evaporator has the following advantages:
1. Due to the centripetal force and friction between the liquid sample and the evaporation bottle, the liquid sample forms a liquid film on the inner surface of the evaporation bottle, and the heat receiving area is large;
2. The force generated by the rotation of the sample effectively suppresses the boiling of the sample. The above features and its convenient features make the modern rotary evaporator available for rapid and gentle distillation of most samples, even for operators with no operational experience.
The biggest drawback of rotary evaporator applications is the boiling of certain samples, such as ethanol and water, which will result in the loss of sample collection by the experimenter. In operation, it is usually possible to prevent boiling by carefully adjusting the working strength of the vacuum pump or the temperature of the heating pot during the mixing phase of the distillation process. Alternatively, it is also possible to add anti-boiling particles to the sample. For samples that are particularly difficult to distill, including samples that are prone to foaming, a special condenser can also be configured for the rotary evaporator.
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