What is the main problem in bottling of biogas?

liquification of biogas

According to Wikipedia, biogas typically refers to a (biofuel) gas produced by the anaerobic digestion or fermentation of organic matter including manure, sewage sludge, municipal solid waste, biodegradable waste or any other biodegradable feedstock, under anaerobic conditions. Biogas is comprised primarily of methane and carbon dioxide. [wikipedia]

Methane is the primary constituent of Natural Gas, and we can learn a lot about liquefaction issues from the processing of Liquid Natural Gas (LNG).

The boiling point of methane at standard pressure (1.013 bar) is -161.6 °C (-258.88 °F). So to turn methane into a liquid you have to chill it to cryogenic temperatures. That takes lots of energy. And that is the issue: energy. Biogas has a certain amount of energy in it. If it takes more energy to chill it than you get back when you use it, then it is uneconomical to do.

If you consult the presentation by [gastechnology], you will see it argued that there is a negative scaling effect to liquifaction plants. A liquefaction plant with the capacity to produce 1,000 gallons of LNG a day might cost $US800 per LNG gallon/day ($US800,000) to build, where a liquefaction plant capable of producing 1,000,000 gallons a day would cost $US200 per LNG gallon/day to build. (This ignores the operating costs, the energy to chill the gas to its boiling point).

So it is a lot more effective to produce LNG on a large scale - by the tanker full.

Biogas plants are typically small-scale: 100kW to 1 MW. At that end of the scale, the cost of capital (interest costs) plus the operating costs (energy consumption) make liquefaction of biogas on a small scale uneconomic.
Water vapor?
it is easy not so hard because in my garden some 5-6 years ago we have made it

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