[arkulkarni245]

Hello,
I am a graduate student and need some information about the energy associated with a vacuum pump for a process that I am designing.
Problem description
1. Consider an ideal gas in a fixed volume at a pressure of say 1.5 bar.
2. The idea is to remove 90% of the vapor contained in the box (as the product) so that the pressure drops to 0.15 bar.
3. The product needs to be at 1 bar, eventually. The vapor left inside the box now is at a pressure of 0.15 bar but contains 10% of the initial moles of the gas.
4. It is a BATCH process and a closed system (apart from the product withdrawal)

Approach
1. I think I need to use a vacuum pump. The initial pressure is > 1bar because of which the vapor should flow by itself to the downstream pressure of 1 bar.
2. Maybe after that a vacuum is required to get the pressure from 1 bar (inside the box) to 0.15 bar by removing the product.
3. To me, it seems more like a 'startup' of a vacuum pump than an actual operating vacuum pump.

Any help will be appreciated.
Thanks,

Cheers,
Ambar

Ps. I am a chemical engineer by training so very technical answers are fine.