4 replies to this topic

[daraj]

Hi all, for effecting vacuum in a distillation column once I determine the leakage rate of air+non condensibles in kg/hr (or m3/hr) are there any correlations or curves available to come up with a rough duty of the liquid seal vacuum pump needed? this is required for conceptual design/costing purposes so need not be super accurate.

 

to summarize, given a column of particular size and vacuum needed(liek say 200mmHg) what is the approximate duty(or power in BHP) of vacuum pump needed is the topic on which I am looking for some thumb rules or some industry established quick methods..

[breizh]

Hi,

Let you study this document attached .

From  my memory you should be able to find calculators on Internet . I've in mind one from Edwards pump

Good luck

Breizh 

[daraj]

thanks for quick response as always..will go thru the document

[daraj]

iam wondering, using the simulator, if the vacuum pump can be modeled as some sort of compressor or blower with suction at vacuum and discharge at atmospheric pressure or above and get the power calculated(by manipulating the efficiency inputs) and use it as some sort of  duty?

[daraj]

if yes, then what can the effieincy be mentioned as in aspen to arrive at correct duty?