High pressure gas cylinder transfer----make money online

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today on Applied Science I want to talk

about passing gas from one cylinder to

another so the problem is this cylinder

is full of ethylene but it's a rental so

I have to return it and I want to

transfer the ethylene to this cylinder

which is empty that I own so let me show

you the setup I have the full cylinder

connected to the empty cylinder with

this high pressure copper line and then

there's a tee and a valve and a vacuum

line that runs down to the vacuum gauge

and this vacuum pump here so we're

currently at about 340 military and the

purpose of that was just to get the

remaining gas out of the empty cylinder

and also to remove the air in the line

between the two cylinders so this way

I'll have a very clean transfer and I

wanted to worry about contaminating the

gas this is only 99.5% pure gas anyway

so it's not like I have to get every

last molecule out I also have the

receiving cylinder in this water bath

that's chilled to about seven point

something degrees C and the purpose of

that is to get the ethylene to turn into

a liquid in the receiving cylinder and

pull more gas out so ethylene is

normally supercritical at room

temperatures and at the pressures that

are inside these cylinders so if I were

to just connect the two cylinders

together at room temperature and open

both valves I could save about half the

gas you know the pressures would

equalize the volumes are about the same

and I'd end up would have but since I

want to you know save as much gas as

possible if I pull this down and cause

the ethylene to condense in here it will

lower the pressure in the system and

we'll get more more gas to transfer

the temperature in the receiving

cylinder is below the critical

temperature so we should get real liquid

to form there I also have the full

cylinder on a scale so that we can

measure how much mass has actually been

transferred this should have held about

5 pounds of ethylene when it was full

and I've used a very small amount so far

okay so I'm going to close the valve

here which will isolate the vacuum

system from the transfer and I'm going

to turn off the vacuum pump just so we

can hear if there's any sort of flushing

or whatever noise this is going to make

when we transfer and now I'm going to

open this valve as slowly as I can

the fitting here is getting quite cold

and you can see there's frost forming on

the copper piping

we've transferred about two and a half

pounds of gas and what's interesting is

that the cooling water temperature has

risen to about eight point nine degrees

C and the critical temperature is nine

point two so very likely the temperature

of the gas inside the receiving cylinder

is still supercritical so we have to

wait a while for my cooling water system

to lower the temperature further and

we'll see if we get more mass transfer

as the gas liquefies in the receiving

cylinder after waiting for the receiving

cylinder to cool down some more we still

only transferred about 2.6 pounds of gas

and so I added engage here to help

figure out what's going on and the gauge

shows that we're definitely below 50 bar

which means that there's no

supercritical ethylene anywhere in the

system it's got to be entirely gas here

and gas liquid mix in the receiving

cylinder and I even used a heat gun to

make sure that the starting cylinder is

not is over 10 degrees C so there's no

liquid in here at all so either they

under filled me or I used more gas than

I thought or there's a problem with the

scale or a combination of all these

things but I think I've transferred all

the gas that I can so I'm going to give

this cylinder back now okay see you next

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