How are liquefied gases bottled
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How are liquid carbon dioxide, liquefied hydrocarbons, etc., bottled? What is the typical pressure inside the empty bottles?
New bottles need to be purged with nitrogen, while there is no limit on the back pressure in old bottles; of course, the lower it is, the better. It should not exceed the saturated vapor pressure of the liquefied hydrocarbon. The filling equipment is a metering filler that is connected to a transfer pump.
During the filling process, is there a vapor equilibrium pipe between the bottle and the tank storing liquefied hydrocarbons?
Bottle it? Do you mean a sampling bottle?
When filling the Dewar tank with liquid nitrogen from the tower, the exhaust valve of the Dewar tank is first opened to release pressure, after which liquid nitrogen is introduced through the liquid-phase pipeline. Exhausting gas is continued throughout the filling process. In some cases, gas cylinders are cooled to low temperatures, which naturally reduces the pressure inside them, allowing the liquefied gas to be filled in
This post was last edited by Qingse Nianhua on 2018-9-24 at 13:04. Are there specific filling specifications?
For liquid hydrocarbon empty tanks, we usually maintain a pressure of 5 to 6 kilograms, or it can also be at zero pressure
If it’s 0, won’t the gas cylinder collapse?
No, the gauge pressure is 0; it’s not a vacuum condition, because when we replace the bottle, we also exhaust the air inside it