Hi HiTech,
the procedure is much simpler than you assume. The gas container basically consists of a plastic pipe with a check valve.
The pipe is attached to a balloon which is inflated more with every fart.
When the pressure of a new fart is weaker than the pressure inside the balloon the "gas provider" shows up at my lab and gets pressure (and pain)relief.
However the balloon is big enough to store up to one dozen of strong gas charges.
The conversion from gas to liquid is no problem in Thailand. Even factories with high and strongly smoking gas exhausts don't use any filtering. The have used filters for a while and found they clogg up too quickly, so omitting the filters the gases can pass freely.
The smoke travels to Cambodia and Vietnam anyway.
Boncuk