Precautions for daily use of rotary evaporator
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Precautions and safety instructions for rotary evaporators

Rotary evaporators are primarily used to continuously distill large amounts of volatile solvents under reduced pressure. In particular, the concentration of the extract and the distillation of the receiving liquid in the chromatographic separation can separate and purify the reaction product. The basic principle of a rotary evaporator is vacuum distillation, that is, under reduced pressure, the distillation flask is continuously rotated as the solvent is distilled.

There are many problems that need to be paid attention to during the use of the rotary evaporator. If it is used improperly, it is easy to cause damage to the rotary evaporator. Therefore, the user needs to master the precautions for using a rotary evaporator. Today we will introduce the precautions and safety instructions for rotary evaporators. I sincerely hope that this article will help you when using a rotary evaporator.

Precautions before using the rotary evaporator

Precautions before using the rotary evaporator

First, the precautions for using the rotary evaporator.

  1. Precautions before using the rotary evaporator

Transport of rotary evaporator

  1. The rotary evaporator must be carried by the surveyor and cannot be bumped or inverted.
  2. When the rotary evaporator is checked, it must be placed in a shockproof box with a cushion. And the words “not inverted” should be marked on the outside of the box, and the words “optical or electronic instruments should be handled carefully, and should not be stressed”. If necessary, send someone to escort it.
  3. When the rotary evaporator is transported by a car, it is necessary to prevent bumps and vibrations. It should normally be placed on the front cushion of the car or placed on the leg by a person. It can also be carried on the back and not on the trunk of the car.
  4. When moving at a short distance, the instrument should be held vertically so that the instrument maintains the vertical state of the vertical axis. Do not lie on your shoulders to avoid hurting the instrument or damaging the shafting of the instrument.
  • Unpacking, packing and closing the rotary evaporator
  1. After the rotary evaporator is turned on, familiarize yourself with the corresponding positions of the components. When taking the instrument, hold the bracket with one hand or both hands, and slowly take it out. It is strictly forbidden to use a portable telescope or a horizontal axis.
  2. Before removing the instrument, first place the tripod, put it on the tripod immediately after removal, and fix it with the center screw.
  3. The observer should not leave the instrument before the rotary evaporator is packed.
  4. When the rotary evaporator is packed, the brake screw should be fixed or loosened according to the type of instrument. Once the parts have been placed in their respective positions, the lids can be lightly closed and the hooks on both sides fastened.
  5. When checking the box, pay attention to the inspection tools and accessories to see if they are properly placed, so as not to shake the equipment during transportation and damage the instrument components.
  6. When the oven and the cover are in trouble, the cause should be ascertained and then replaced. Hard pressure and hard buckle are strictly forbidden.
  1. Precautions for daily use of rotary evaporator

    Precautions for daily use of rotary evaporator

    Precautions for daily use of rotary evaporator

1 Glass equipment should be handled gently, washed and dried before loading.

  1. Each grinding port, sealing surface sealing ring and joints need to be coated with a layer of vacuum grease before installation.
  2. The heating tank must be filled with water before it is energized. It is not allowed to dry without water.
  3. If the vacuum cannot be pumped up, check it:

(1) Whether the joints are sealed or not.

(2) Sealing ring, whether the sealing surface is effective.

(3) Whether the vacuum grease between the main shaft and the seal ring is coated.

(4) Whether the vacuum pump and its hose are leaking.

(5) Whether the glass parts are cracked, broken or damaged.

  1. Add the liquid to be evaporated to the flask and the volume should not exceed 2/3. Install the flask and secure it with the bayonet.
  2. Turn on the pump and draw a vacuum. After the flask is sucked, place the flask in a water bath with the lift control switch.
  3. Turn on the power of the rotary evaporator and slowly turn it to the right to adjust to a stable speed.
  4. Heat the water bath and set the heating temperature based on the boiling point of the liquid in the flask.
  5. Rotate and evaporate at the set temperature.
  6. After steaming, use the lift control switch to remove the flask from the water bath. Turn off the speed knob to stop the rotation. Open the vacuum piston, let the system pass to the atmosphere, remove the flask, and turn off the pump.

Third, the safety instructions of rotary evaporator.

the safety instructions of rotary evaporator

the safety instructions of rotary evaporator

  1. Before starting to use the rotary evaporator, please read the instrument manual supplied with the product to familiarize yourself with the operation and performance of the instrument.
  2. Please ensure that the input voltage of the rotary evaporator is the same as the voltage indicated on the instrument nameplate. The power socket must be grounded.
  3. Before starting the machine, pay attention to whether the safety of the heating pot is reasonable. The safe temperature of the heating pot should be at least 25 degrees lower than the burning point of the treated medium.
  4. Do not operate the rotary evaporator in an explosive environment or under water.
  5. In order to prevent pressure build-up, when operating under normal pressure (eg, not working), the glass components should be kept ventilated.
  6. Rotary evaporator experience: During the use of the rotary evaporator, be sure to keep the water in the water bath and the pump clean and the entire unit clean.
  7. Between the rotating bottle and the rotary steamer, the grinding bottle is connected to the main body by high-temperature silicone grease, and is equipped with a plastic label holder. The connection is not very strong, and the steaming bottle is often used in the water bath after use.
  8. If there is a power outage, the water in the pump will be poured into the rotary steaming system.
  9. In rotary evaporation, if the boiling point of the solvent is low, the rotary liquid in the rotary flask will be flushed into the condenser during the rotary steaming process. Finally, enter the liquid bottle. The above situation is inevitable. If the rotary steaming is kept clean, the formed oil-water mixture or the liquid-solid mixture can be obtained by filtering, concentrating and purifying the column to obtain its own target product.
  10. Pilot rotary evaporator

In the market, the rotary evaporator is used as a pilot plant, and the volume is generally 50L. The operation used is not much different from the laboratory rotary evaporator.

  1. The rotary steamer is basically fixed, and the height of the oil bath is raised and lowered by the iron frame to adjust the contact between the oil bath and the rotary steam bottle.
  2. When feeding, it is different from the laboratory directly in the steaming bottle, and the reaction liquid is inhaled through the feeding valve.
  3. Add distilled water to the water bath to avoid scaling in the pot.
  4. When the vacuum is less than 0.08Mpa, the sealing ring should be replaced in time to avoid damage to the machine.
  5. A straightened rotating bottle must be used as this will damage the glass straight tube.

    rotary evaporator

    rotary evaporator

The above mentioned text is a brief introduction to precautions and safety instructions for rotary evaporators. If you want to know more the rotary evaporator, please contact with henan lanphan. Henan lanphan is a qualified company, which boasts high reputation both home and board. we are dedicated to the manufacture of laboratory equipment and pipe fittings, which has the good quality and price. If you want to know more about this, please contact with henan lanphan. We are willing to provide you as much information as possible.

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