The rotary evaporator is one of the commonly used laboratory instruments, which is a simple and mature product. It mainly consists of a motor, a distillation flask, a heating pot, a condenser and other components. It is mainly used for distillation, concentration, drying, recovery and other processes in synthesis and analysis. It is electronically controlled to rotate the evaporation flask at a suitable speed to increase the evaporation area; Place the evaporation flask under negative pressure using a vacuum pump; The evaporation flask is placed in a heating pot while rotating, and the solution inside the flask under negative pressure and heating diffuses and evaporates during rotation. The frequency of use is very high in chemical laboratories. It has the advantages of easy maintenance, stable performance, safe and reliable use, and high sensitivity. Its application scope covers chemical enterprises, pharmaceutical enterprises, universities, research institutes, and other units. Next, the editor of Xianji.com will provide a detailed introduction to the usage steps and precautions for common configurations of the rotary evaporator.

Instructions for using a rotary evaporator

1. Prepare a white latex tube with an inner diameter of about 8 millimeters and a length of about 1500 millimeters. Additionally, prepare two latex tubes with a length of about 80 millimeters and the same specifications, and vacuum them; Prepare one copper tee as a backup; One SHZ-D (III) circulating water vacuum pump, the water tank of the vacuum pump must be filled with water, and the water should be added to submerge the head of the vacuum pump.

2. Firstly, we will connect the prepared latex tube with a length of about 80 millimeters to both ends of the tee, and then proceed with the connection; We found the suction port of the circulating water vacuum pump, and the identification of the suction port is: suction I and suction II. Then, connect the two ends of the tee connected to the milk hose to suction I and suction II respectively;

3. Prepare 2 hoses with a diameter of about 10 millimeters and a length of about 1000 millimeters, as well as 4 snap rings with a diameter of about 14 millimeters; Find the inlet and outlet of the rotary evaporator condenser; Firstly, we connect the hose to the outlet of the low-temperature coolant, and the other end of the hose to the inlet of the rotary evaporator. The method for identifying the inlet is to carefully observe the serpentine tube inside the glass condenser, observe it from both sides, and continue to find the outlet connected to the outside; Usually located below is the inlet, and located above is the outlet. We use another hose to connect the outlet of the rotary evaporator, and the other end of the hose is connected to the inlet of the low-temperature cooling circulation pump (the inlet and outlet ports are usually marked). Open the liquid inlet cover of the low-temperature coolant circulation pump, clean the cold well tank, and prepare the coolant in a 1:1:1 ratio and add it to the cooling tank. Pay attention to pressing the power button and then the cooling button, and turn on the cycle after reaching the desired temperature.

4. Install the rotating bottle and secure it with a clamp. If there is a splash proof joint, connect it first. After installing the rotating bottle, pay attention to applying vacuum silicone grease to the interface. Turn on the vacuum pump and wait for a certain amount of vacuum before starting to rotate.

5. Adjust the height and rotation speed of the distillation flask, and set the appropriate water bath heating temperature.

6. After steaming, stop rotating first, then let the atmosphere flow, stop the water pump, and then remove the distillation flask.

7. Stop the low-temperature coolant circulation pump, stop the water bath heating, turn off the water pump circulation water, pour out the solvent in the receiving bottle, clean the buffer ball, and receive the bottle.

Precautions for using commonly used configurations of rotary evaporator

1. Heating water bath: The general heating medium is water. If there is a special requirement for temperature, it can be replaced with silicone oil or high-temperature silicone oil! Although the manufacturer will provide a lid on the water bath pot, the frequency of use is not high during use; Static time can prevent dust from entering the water bath or oil bath and keep it clean.

2. Condenser: The typical cooling medium is water. If the ambient temperature is high and the condensation effect is poor, it can be replaced with an ethanol bath, and the device should be equipped with a circulating freezer. Pour the cooled ethanol into the condenser for cooling treatment. When encountering cold weather and not in use, it is necessary to drain the water in the condenser overnight to prevent the water from solidifying, expanding and cracking the condenser due to volume expansion.

3. Pressure reducing equipment: commonly configured as a water pump. For certain high boiling point solvents, the water pump can be replaced with an oil pump, and attention should be paid to the equipment requirements when replacing.