Due to the limits of grid infrastructure in certain regions and prob- lems relating to storage and distribution systems for CBG, interest in technologies which convert biomethane to even higher energy density and more feasible transportability has increased. The option of converting biomethane to liquid biofuels would facilitate the supply of biofuels to geographically broader and larger markets. Furthermore, the potential for blending with liquid fossil fuels would be very useful. Today there are different routes for exploiting biogas energy as liquid biofuel. Liquefied biogas (LBG) is a form of upgraded biogas that has
been cooled and liquefied at temperatures around − 161 °C under at- mospheric pressure by cryogenic technology. LBG is three times more space-efficient than CBG (stored at 200 bar), while the fuel is in the gas phase when it reaches the engine [3].