How To Choose A Rotary Evaporator And Its Supporting Products?

2020-06-10 15:02:15
How To Choose A Rotary Evaporator And Its Supporting Products?
Before purchasing a rotary evaporator, you must first think about and clarify some issues, such as how much distillation is required at one time, how many samples need to be distilled every day, what solvents are expected to be distilled, what is the approximate range of the boiling point of the solvent, and whether these solvents are flammable, explosive, or toxic and harmful. After determining the experimental requirements and the type of solvent to be distilled, you can contact us to consult about the rotary evaporator. When purchasing a rotary evaporator, you usually need to consider 7 issues:

1. Does the manufacturer have the core technology of the rotary evaporator?

Under the corrosion of various solvents and in motion, whether the system can maintain a high vacuum is the most important criterion for measuring a rotary evaporator. LABOAO uses Teflon plus fluorinated rubber to independently develop double seals, which can withstand various solvents, have long-lasting and reliable airtightness, and can maintain a high vacuum of more than -0.098MPa.

2. Factors affecting the efficiency of the rotary evaporator

For instruments of the same specification, the main ones are: steam temperature, vacuum degree, and cooling water temperature. Due to the heat resistance of some materials, it is impossible to increase the steam temperature infinitely during operation, so high vacuum and low cooling water temperature are the two main factors to increase efficiency. We use hidden heating, water-electricity separation to delay corrosion and protect the heating plate.

3. The difference between vertical condensers and oblique condensers

Vertical condensers are gradually popular in the market due to their small footprint and beautiful appearance. Large-capacity evaporators generally use vertical condensers, but in essence there is no difference between the two instruments, and we also support product customization.

4. Selection of rotary evaporator models

1L, 2L, 3L, 5L machines are suitable for laboratories and small sample tests; 5L, 10L, 20L, 30L are suitable for pilot tests; 30L, 50L are suitable for pilot tests and production, especially for the extraction of materials that need to delay metal ion contamination. And there is also explosion-proof rotary evaporation.

5. Advantages of rotary evaporators and similar products

The rotary evaporator is small and compact in structure, intuitive in operation, and free of metal ion pollution. It is suitable for laboratories, production pilot tests, and the extraction of precious materials.

6. Vacuum pump for rotary evaporator

Recommended circulating water vacuum pump and diaphragm vacuum pump that are resistant to corrosion by various solvents, which can be vacuumed to -0.098MPa, can meet various use requirements.

7. Material of rotary evaporator

The vacuum value of the system and the vacuum degree are the most important process parameters of the rotary evaporator. The closed space of the rotary evaporator is composed of glass components such as evaporation bottle, evaporation tube, sealing ring, condenser tube, vacuum buffer bottle, vacuum pump and vacuum pipeline. The higher the temperature of the heating pot, the faster the distillation effect of the solvent, the faster the speed of the evaporation bottle, the larger the infiltration area of the inner surface of the bottle, and the larger the heating area; but at the same time, the thickness of the liquid film is also thicker, which increases the temperature difference of heat transfer. For materials with different viscosities, there is a speed difference. The rotational power is provided by a motor. There are brushless DC motors, AC motors and stepper motors on the market, and their quality varies. The feedback of brushless DC motors is better. Our company's conventional products all use brushless DC motors. For the best distillation efficiency, it is generally recommended to maintain a temperature difference of 40°C between the cooling medium and the heating pot temperature so as to quickly condense the hot steam and reduce the impact of steam on the system vacuum.