Rotary evaporator use and precautions
The rotary evaporator is used to continuously distill a large amount of volatile solvent under reduced pressure, especially for concentration of the extract and distillation of the receiving liquid during chromatographic separation, and the reaction product can be separated and purified. The basic principle is vacuum distillation, that is, under reduced pressure, the distillation flask is continuously rotated as the solvent is distilled. However, in order to use the rotary evaporator correctly, you need to master the correct method of use, and you need to pay attention to the following during use:
How to use the rotary evaporator:
1. Height adjustment: manually lift and turn the hand wheel above the machine column, and turn it to rise and reverse to decrease. Electric lift, the hand touches the rise button and the main unit rises, and the hand touches the down button to lower the main unit.
2. There are two external joints on the condenser for connecting the cooling water. One end is connected to the water and the other end is connected to the water. Generally, the tap water is connected. The lower the condensed water temperature, the better the effect. The upper port is equipped with a vacuum connector and the vacuum pump is connected. The tube is used for vacuuming.
3. Turn the speed control knob to the minimum before starting the machine, press the power switch indicator light, then slowly turn to the right to the required speed. Generally, the large evaporation bottle uses medium, low speed, high viscosity solution with lower speed. The flask is a standard interface No. 24, and is supplied with two flasks of 500 ml and 1000 ml, and the amount of the solution is generally not more than 50%.
Note on the rotary evaporator:
1. The glass parts should be handled gently and gently, and should be washed, dried or dried before installation.
2, each grinding mouth, 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. RE-52B must be screwed into the fuse hole (19) to avoid damage to the flask.
5, if the vacuum can not be pumped up need to check:
(1) Whether the joints are sealed or not.
(2) Sealing ring, whether the sealing surface is effective.
Durable Aluminum Rollator with Seat: Stylish and modern aluminum rollator rolling walker features a durable frame, padded seat and backrest, and a spacious storage pouch
4 wheels rollator :8-inch wheels and soft-grip tires are perfect for indoor/outdoor use
Sturdy and Lightweight: the portable rollator is easy to transport; built for everyday use with a weight capacity of 300 poundsAdjustable Fit: Rollator`s easy-turn lever allows you to quickly adjust the height of the ergonomic handles; height-adjustable rollator also includes a removable hinged backrest that can be folded up or down for easy storage
Rollator walker folding: Rollator walker with side-to-side folding design allows easy folding with one hand and maintains a standing position, making this folding walker exceptionally easy to roll, park, and store anywhere
Aluminum walker rollator,Rollator walker with seat,4 wheels rollator,Rollator china,Rollator walker folding
Foshan Oscar Medical Instrument CO.,LTD , https://www.fsoscarmed.com