What is a rotary evaporator
Rotary evaporators can be used to evaporate organic solvents. It uses a motor to drive the distillation flask to rotate. Since the still is constantly rotating, there is no need to add zeolite without overboiling. At the same time, due to the continuous rotation, the liquid adheres to the wall of the distiller, forming a liquid film, which increases the area of evaporation and accelerates the evaporation rate.
Rotary evaporator applications
It is used to separate a large number of highly volatile components;For residue removal or decolorization;Suitable for products with high viscosity and easy to freeze;Used in heat-sensitive materials.
How it works:
By means of electronic control, the flask rotates at a constant speed at the most suitable speed to increase the evaporation area. The evaporation flask is placed under negative pressure by means of a vacuum pump. The evaporation flask is heated at a constant temperature in a water bath while rotating, and the solution in the flask is heated and diffused in the rotating flask under negative pressure.
The open and direct construction also makes them very easy to maintain and repair. In addition, these evaporators are designed with various safety features (dry heat shut-off, over-temperature protection, soft-start rotation, over-current protection).
How to detect air leakage in the instrument
Rotary evaporator is a conventional equipment and instrument in the laboratory, usually in the use of ** now air leakage is a commonly used phenomenon, air leakage in the test process to bring you a lot of trouble, so that the normal decompression distillation speed slows down the efficiency of the reduction. If there is a large air leak, you can quickly find the location of the air leak and quickly solve it, but under normal circumstances, many air leaks cannot be found, so the following provides a simple small method.
Connect the rotary evaporator to the vacuum pump, connect the rotary bottle and the collection bottle, then close all the valves, turn on the vacuum pump and let the rotary evaporator work, at this time, the vacuum level can also be pumped to 008-0.09 position, but not drawn to 0When 09 or above, it means that there is a slight leakage in the whole system, so please connect the pipe to the water source on the air release valve.
And open the valve, use negative pressure to suck water into the rotary evaporator, so that each glass space in the rotary evaporator is filled with water. (When the water fills the condenser and the collection bottle, the rotary bottle and the rotary shaft dynamic sealing system, the water will generate a certain weight, and in order to avoid damage to the instrument, it is necessary to cooperate with the personnel to hold the individual parts with their hands.) At this time, you can observe the bubbles in that place in the entire vacuum system, which means that there is a problem of poor sealing in this place, and then you can find the problem for further plugging treatment.