How to choose rotary evaporators for distillation and purification

How to choose rotary evaporators for distillation and purification Rotary evaporator is an experimental equipment for rectifying and purifying in the laboratory It can continuously evaporate a large number of volatile solvents by constant temperature heating and rotating under the condition of reduced pressure (negative pressure), and then condense and recover the solvent to achieve the effect of purification and separation That is to say, under the condition of reduced pressure, when the solvent is distilled, the distillation flask is rotating continuously The distillation flask of the rotary evaporator is a pear shaped or round bottom flask with a standard grinding port interface, which is connected with the pressure reducing pump through a high reflux serpentine condensate pipe, and the other opening of the reflux condensate pipe is connected with the receiving flask with grinding port for receiving the evaporated organic solvent There is a three-way piston between the condensing pipe and the pressure reducing pump When the system is connected with the atmosphere, the distillation flask and the liquid receiving flask can be removed and the solvent can be transferred When the system is connected with the pressure reducing pump, the system should be in the pressure reducing state When using, reduce the pressure first, and then start the motor to rotate the distillation flask At the end, stop the machine first, and then open the atmosphere to prevent the distillation flask from falling off during the rotation As the heat source of distillation, the rotary evaporator can be combined with the circulating water multi-purpose vacuum pump, diaphragm vacuum pump, low-temperature circulating (vacuum) pump, circulating cooler, constant temperature circulator, low-temperature coolant circulating pump and other supporting system devices When using the rotary evaporator, it should be noted that there are two external joints on the condenser for connecting cooling water One is connected to water inlet, and the other is connected to water outlet Generally, the water is connected to tap water The lower the temperature of the condensate is, the better the effect is The upper port is equipped with a vacuum joint, which is connected to the vacuum pump for vacuum pumping Before starting the machine, turn the speed control knob left to Zui, press the power switch indicator to light up, and then slowly turn it right to the required speed Generally, medium and low speed solutions with high viscosity are used The flask is No 24 standard interface, with two kinds of flasks of 500ml and 1000ml attached, and the amount of solution is generally not more than 50% When using the rotary evaporator, the glass parts shall be handled with care, cleaned, dried or dried before installation Each grinding port, sealing surface sealing ring and joint shall be coated with a layer of vacuum grease before installation Water must be added before the heating tank of rotary evaporator is electrified, and no dry burning without water is allowed Whether all joints and interfaces are sealed Whether the sealing ring and sealing surface are effective Whether the vacuum grease between the main shaft and the sealing ring is well coated Check whether the vacuum pump and its skin tube leak Whether the glass parts are cracked, broken or damaged When selecting the rotary evaporator, you can choose it according to the specific situation Generally, the Great Wall instrument R-Series rotary evaporator can be used in the laboratory If you need the large-scale R-Series rotary evaporator of the large-scale purification distillation rotary Great Wall instrument, you can The large-scale rotary evaporator has a large capacity and large caliber rotary evaporation bottle, which can be used for small-scale test, pilot test and production in the fields of biology, medicine, chemical industry, food, etc.