Lifting heating bath-Glass ware is fixed firmly, which decreases damage. Collecting bottle sinks in ice water, thus the second evaporation is decreased.  Vertical condenser-Flexible, three king of choice can be did, with a cold trap, it can be used to collect evaporation vapour that has lower boil point. Device for loosening the bottle-The mouth of rotary bottle is ISO29 standard mouth. The bottle can be loosed easily by turning the screw of the device, which reduces destroying the glassware. It overcomes the difficulty of loosening the bottle in high temperature. Low noises design.