Original title: Instructions for Use of Rotary Evaporator Rotary evaporator is mainly used for concentration, crystallization, drying, separation and solvent recovery in pharmaceutical, chemical and biopharmaceutical industries. The principle is as follows: under the vacuum condition, the rotating bottle is heated at a constant temperature, so that the rotating bottle rotates at a constant speed, and the material forms a large-area film on the bottle wall and is evaporated efficiently. The solvent vapor is cooled by a high-efficiency glass condenser and recovered in a collecting bottle, thereby greatly improving the evaporation efficiency. It is especially suitable for the concentration and purification of biological products which are easy to decompose and denature at high temperature. The rotary evaporator of our company has formed 2L, 3L, 5L, 10L, 20L and 50L series by collecting the essence of similar products at home and abroad and accumulating the successful practical experience of our company. The product design follows the principles of high efficiency, practicality and economy. All for the sake of users. Features of R-3001 rotary evaporator: 1. Variable frequency speed regulation, imported frequency converter, stable and reliable operation. 2, the use of polytetrafluoroethylene and rubber composite seal,jacketed glass reactor,wiped film distillation, can maintain a high degree of vacuum. 3. Adopt high-efficiency condenser to ensure high recovery rate. And 4, that rotate bottle is connected by a nut, and is convenient to assemble and disassemble. Expand the full text And 5, a piston is arrange at that lower open of the collecting bottle, so that the solvent can be recovered very quickly. And 6, continuous feed is available. 7. The vacuum system is equipped with a vacuum meter, which can select the best working vacuum degree for low boiling point materials. 8. The water bath pot is controlled by digital constant temperature and can be lifted up and down. 9. Reasonable structure and exquisite materials. A large number of stainless steel and aluminum alloy parts are used in mechanical structure. All glass rooms are made of high temperature resistant glass. Rubber seal wearing parts all adopt the new national standard,thin film distillation, which is convenient for users to purchase and replace. Installation of rotary evaporator 1. Place the rack near the water source and firmly on the workbench. In case of unevenness, four rubber feet can be placed. 2. Install the upright rod of the electric cabinet and the electric cabinet on the rack, tighten the fixing nut thread, and connect the coreless plug of the motor. 3. Install the fixing clip of the condenser on the vertical rod of the vacuum meter, and then install the vertical rod of the vacuum meter on the rack and fix it. 4. Install the gas guide bottle on the machine head. 5. Connect the secondary condenser with the gas guide bottle, support it with a bracket, and install a special PTFE gasket at the connection. 6. Connect the collecting bottle with the secondary condenser, hold it with a bracket, and install a special PTFE gasket at the connection. 7. Insert the main condenser on the auxiliary condenser and fix it with the fixing clip. 8. Installation, extraction port, feed valve and discharge valve. 9. Install the rotating bottle on the machine head, and press the locking button on the machine head to lock the rotating bottle. 10. Place the water bath pot under the rotating bottle and add water to 2/3 of the pot. Adjust the water bath height. 11. Connect the joint above the vacuum meter with a vacuum hose at the exhaust pipe, rotary vacuum evaporator ,jacketed glass reactor, and connect the other joint to the vacuum pump. 12. Connect the cooling water and feeding pipe. Precautions for rotary evaporator: 1. All glass parts shall be cleaned before installation. 2. Apply a small amount of vacuum silicone grease on each standard port and sealing surface to increase the airtightness. 3. Be sure to lock the bottle mouth, bracket and machine head before the instrument works. 4. Do not move the whole machine. Application method of rotary evaporator The evaporation rate of the instrument depends on three conditions: 1. The better the vacuum degree is, the faster the speed is. The vacuum degree shall not be less than 0.096 MPa during water evaporation. 2. The higher the water bath temperature, the faster the speed, generally not more than 80 degrees, according to the specific process requirements. 3. The lower the cooling water temperature is, the faster the speed is, and the better the refrigeration effect is. (I) Operating procedures 1. Vacuumize. After turning on the vacuum pump, check whether the bottle mouth is sealed, whether the vacuum pump itself leaks, and whether the sealing ring at the rotating shaft is intact. Connect a vacuum switch in the external vacuum tube to fine-tune the best recovery rate and evaporation rate. 2. Feeding: By using the vacuum negative pressure of the system, the liquid material can be added to the material port and sucked into the rotating bottle with a hose. The liquid material should not exceed half of the rotating bottle. The instrument can be used for continuous feeding. 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,wiped film evaporator, 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