Had to put in a warning and I'm gonna repeat it here, no apologies.
To get a boiling point down to 50 degrees C you need to drop the pressure from 1 bar to about 0.1 bar
That's almost 90 percent.
Atmospheric pressure is about a ton per square foot. if you pump the air out, that's the pressure you're putting on the vessel walls. It's just the same as if you pressurised it to nearly 1 atmosphere instead.
Glass won't take it. A small bottle maybe, a 1 gallon demijohn might, but try it with a carboy and death is a real possibility.
When the vessel implodes, you get all the energy back in one lump that you spent in pumping out the air. Think of it as a massive airgun, loaded with broken glass and set to blow right in your face.