1.Compared with conventional microwave equipment:

1)Low temperature:under one atmospheric pressure (101.3 kpa), the boiling point of water is 100 °C.But under 0.073 of one atmospheric pressure(7.37 kpa), the boiling point of water is only 40 °C.It is on negative pressure condition when using microwave vacuum device,material can be processed under low temperature.So the quality of the material can be guaranteed tremendously. The machine is especially suitable for drying material which need to dry in the low temperature, such as herbal extract,ginseng,ect.

2)Pressure:In negative pressure environment with microwave vacuum device,moisture evaporates faster in the lower temperature.

2.Compared with conventional vacuum drying equipment:

1)Penetration:because it is in vacuum situation when using conventional vacuum drying equipment,heat cann't transfer in the form of convection and can only conduct.So the heating speed is slow,drying time is long and the energy consumption is excesive.However,Microwave vacuum drying equipment adopts radiation way to transfere energy and it heat wholly without any medium.Itavoids the above shortcomings.

2)Evenly:microwave heating is in and outside of the material at the same time,the temperature difference is very small in and outside of the material.So it is more evenly when drying materials,and the heating efficiency is greatly increased.

3)Quickly:because of the penetration of the microwave and the radiation way to transfere energy, materials is heated inside and outside at the same time.Thus the drying speed is greatly improvedl.