Vacuum pump (two)

(2) Vacuum oil pump

The vacuum oil pump can provide a working space with a higher vacuum degree than the water pump

1.

The vacuum oil pump is divided into two parts, consisting of a motor and different types of oil pumps

Figure 22-19 Vacuum oil pump

Vacuum oil pumps are rarely used for vacuum distillation in chemical laboratories, and are mainly used for low-temperature freeze-drying and heating ovens

2.

The assembly sequence of the whole set of vacuum distillation equipment (from left to right): heating device, distillation flask, capillary (or magnetic stirrer), Kjeldahl distillation head, thermometer, straight condenser, receiver, collection bottle, safety bottle ( It can also be used as an empty bottle), cold trap, vacuum gauge (such as U-shaped mercury pressure gauge), dry absorption device (including calcium chloride filled water vapor absorption tower, granular sodium hydroxide filled acid gas absorption tower, and paraffin flake filling The organic vapor absorption tower), vacuum pump, as shown in Figure 22-20

Figure 22-20 Complete vacuum distillation unit

The above main unit devices are indispensable

Figure 22-21 Gas drying tower

In addition to U-shaped mercury differential pressure gauges, there are many types of vacuum gauges or vacuum gauges commonly used, which can be installed as required

The vacuum oil pump is taboo to enter a large amount of air, and it cannot be used for a long time without load

Before the oil pump vacuum distillation, all low-boiling liquids, water, and acid and alkaline gases must be distilled off under normal pressure or water pump reduced pressure