Effect on the efficiency of refrigeration of low temperature unit in thermal sinking test

with the increasing lying of the production technology of laboratory equipment in China, more and more university laboratories are beginning to use rotary evaporatorThe rotary evaporator is a rotating evaporation bottle, increasing the evaporation area under decompression and placing it in a water bath while rotating, while heating the device, so that the solution in the bottle diffuses evaporationThe following small compilation for everyone to say that the function of rotary evaporator, distillation efficiency factors and application rangerotary evaporatorrotary evaporator is mainly used to continuously distill a large number of volatile solvents under decompression conditionsIn particular, the distillation of the receiving fluid when the extraction liquid is concentrated and chromatographic separation can be separated and purified reaction productsThe basic principle of the rotary evaporator is decompression distillation, that is, under decompression, when the solvent is distilled, the distilled flask rotates continuouslythermal sinking test low temperature unit-
rotating evaporator distillation efficiency factors
1, spin steaming system vacuum(1) rotary evaporating instrument by the vacuum pump and its lines, evaporation bottle and receiving bottle, condensing tube and other components combined synthesisAmong them, the key factors affecting vacuum degree are: vacuum pump power, system closureAmong them, the equipment includes: vacuum pump, sealring and vacuum tubeThe lower the(2) the lower the vacuum pump, the lower the vacuum value of the systemHowever, the vacuum value that the system can form is determined by the pressure resistance of the rotating evaporator's equipment and the avoidance of boiling when the distillation efficiency is guaranteed Setting a reasonable vacuum value, the vacuum controller needs to adjust (3) sealring: connecting the key components between the evaporation tube and the condensing tube, wear-resistant, corrosion-resistant is the main performance requirement (4) vacuum pumps and seals are consumable parts The vacuum level of the vacuum pump should be tested frequently during use to ensure the stability of its vacuum level Seals can be removed as removable accessories and can be replaced directly 2, the heating power of spin steaming the higher the temperature of the oil bath pot, the faster the distillation rate of the solvent In the process of actual distillation, the distillation efficiency is often not pursued by setting the high reaction temperature The reasons include: (1) distilled substances if the heat-sensitive substances, high temperature easily decomposed and spoiled, (2) high temperature, easy to lead to sealing rings and other components of high temperature softening, reduce their service life, reduce the system's closedness In general, the oil bath pot is heated by a water bath, the temperature is set below 60 degrees C The temperature is higher than 80 degrees C and heated in an oil bath 3, the faster the motor speed the motor speed, the larger the soaking area inside the evaporation bottle, the larger the heating area, the thicker the thickness of the liquid film formed, increase the heat transfer temperature difference, the higher the distillation efficiency In the actual use process, the speed is not the faster the better Mainly due to: (1) the faster the speed, the greater the formation of centrifugal force, easy to lead to the drop of the bottle; 4, the cooling system distillation efficiency, the temperature of the cooling system and the temperature of the heating pot to maintain a temperature difference of 40 degrees C, in order to form the hot steam for rapid condensation, reduce the impact of steam on the vacuum of the system The commonly used cooling medium is circulating condensate