Vacuum cascade connection

Figure 3.30 Vacuum control via cascade connection of vacuum pumps.

In many cases, multiple speed-controlled vacuum pumps are also used together. This is necessary in situations where cascade connection with a precision as... 

Absorption is carried out in a system of towers or tanks provided with mixers and cooling jackets, connected in series and arranged in cascades. Chlorine, introduced into the last tank, passes in countercurrent to the flow of the milk of lime (100 to 200 g. Ca O per 1.). In the first tank temperature is maintained at 30 °C, in the second at 40 to 50 °C, in the third at 60 to 70 °C, and in the last one at 35 to 40 °C. The final solution is filtered, concentrated in a vacuum evaporator, cooled and a certain amount of separated crystals of calcium chloride centrifuged. Into a clear, reheated solution surplus potassium chloride is added, in order to achieve the conversion ... 

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