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Instructions for Rotary Evaporator _ Vacuum _ Instrument _ Condenser Full-time Job

2 months ago Engineering San Jose   36 views
Job Details

 Attention shall be paid during feeding: turn off the vacuum pump, stop heating, and slowly open the cock of the feeding pipe after the evaporation stops to prevent backflow. 3. Heating: The instrument is equipped with a specially designed water bath, which must be powered on after heating. The temperature control scale is 0-90 degrees for reference. Due to the existence of thermal inertia, the actual water temperature is about 2 degrees higher than the set temperature. The set value can be corrected when using. If you need a water temperature of 40 degrees, you can set the temperature controller to 38 degrees. Please use a thermometer to measure the precise water temperature directly. Rotate flat into water 1/3 — 1/2. Unplug the power plug with a plug. 4. Rotation: Turn on the switch of the electric cabinet, adjust the knob to the best evaporation speed, and pay attention to avoid the fluctuation of water bath vibration. 5. Connect the cooling water. 6. Recycle the solvent: turn off the vacuum pump, turn on the feeding switch to release the gas, and open the discharge piston to discharge the solvent in the collection bottle. (II) Precautions 1. About vacuum degree: Vacuum degree is the most important process parameter of rotary evaporator, but users often encounter the problem that the vacuum degree can not be reached. This is often related to the nature of the solvent used. Biochemical and pharmaceutical industries often use water, ethanol, acetone, acetic acid, ether, petroleum ether, chloroform, toluene and other solvents. However, the general vacuum pump can not resist strong organic solvents, so the special vacuum pump with strong corrosion resistance can be used. (It is recommended to use water circulation vacuum pump, which is available in our company) A simple way to check whet that instrument is leaking is to clip off the external vacuum hose and observe whet the vacuum gauge on the instrument can be kept for five minutes. If there is air leakage, check whether the sealing ring on each sealing joint and rotating shaft is effective (see maintenance). On the contrary, if the instrument is normal, the vacuum pump and vacuum pipeline should be checked. 2. About motor temperature rise The motor of this instrument is a three-phase, 220V special motor with E-class insulation. The winding is made of polyester high-strength enameled wire. The operating environment and altitude are not more than 1000 meters, and the ambient temperature is not more than 40 degrees. It is normal that the surface temperature of the motor (the difference between the surface temperature of the motor and the environment) does not exceed 45 degrees. If the temperature rise exceeds 45 degrees, check the relevant transmission lubrication system. V. Maintenance 1. Glass parts: In case of serious dirt, dilute sulfuric acid can be used for cleaning. 2. Seal ring, frequently check the wear degree of the seal ring,cbd crystallization equipment, and replace the worn seal ring in time to ensure the vacuum degree. 3. Teflon interface: In general, it is not necessary to disassemble and wash. If there is serious dirt, it can be disassembled and washed. 4. Water bath; if tap water is used ? Regularly clean the water stains on the electric heating coil. To ensure good heating. Return to Sohu to see more Responsible Editor:. toptiontech.com

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