Liquid biomethane (LBM), also known as Bio-LNG, is a clean, renewable energy source.It is produced byfrst upgrading biogas to high-purity biomethane through membraneseparation, then liquefying it via deep cryogenic coling. Under near-atmospheric pressure, the purified biomethane is chiled to approximately -162°C, changing from gas to liquid- reducing volume by 6o0x, dramaticall increasing energy density whil cuing storage and transport costs. Liquefaction is the core process for scaling up biomethane use andturning it into a commercial product.
Significantly lowers storage & transport cost.
Safer than high-pressure compression.
Transforms biomethane into a storable, tradeable energy commodity.
Molecular sieve adsorption removes trace CO₂8 H₂O.
MRC + plate-fin exchanger, cooling to -162°C.
Vertical vacuum insulated tank, low evaporation loss.
01 Raw gas: CO₂‑rich off-gas from membrane separation
iomethane leaving the membrane separation stage stil contains trace amounts of CO2 and water vapor I cryogenic conditions, these impurties freeze and solifycausing blockages in cold boxes, heat exchangers, and pipelines - which can disrupt continuous operation
To prevent this, the raw gas first passes through a deep pre-treatment unit that uses molecular sieve adsorption to precisely remove residual CO2 and water vaporachieving:
√COz<50ppmv |√H₂0<0.1ppmv
This completely eliminates the risk of freeze-ups and ensures reliable downstream operation.
02 Multi‑stage compression with interstage cooling
After pre-treatment, the high-purity biomethane enters the cryogenic liquefaction unit. Here we use the industry-proven Mixed Refrigerant Cycle (MRC) combined with ohigh-efficiency brazed aluminum plate-fin heat exchanger-a configuration well suited for small- to medium-scale plants.
A closed-lop multi-component refrigerant cycle provides staged, gradient cooling. The biomethane is steadily chiled to -162°C, completing the gas-to-liquid phasechange and producing qualified liquid biomethane.
I MRC closed loop | Plate-fin heat exchanger
03 Deep pre‑treatment (molecular sieve)
The finished liquid biomethane is transferred to a vertical vacuum insulated cryogenic tank for closed storage. The tank offrs excellent insulation and very low evaporatinloss, supporting temporary storage, truck loading, and ship loading for off-site transport. This fits perfectly with a small-scale, flexible production and logistics model..Vacuum insulated
·Low boil-off
· Truck / ship loading ready
| Parameter | Value / Description |
| Feedstock | Biogas upgraded via membrane separation (high-purity biomethane) |
| Liquefaction temperature | Approx. -162°C (near-atmospheric pressure) |
| Volume reduction | ~600× (gas to liquid) |
| Pre-treatment impurity limits | CO₂ < 50 ppmv | H₂O < 0.1 ppmv |
| Liquefaction technology | Mixed Refrigerant Cycle (MRC) + brazed aluminum plate-fin heat exchanger |
| Storage tank type | Vertical vacuum insulated cryogenic tank, low evaporation loss |
| Logistics support | Virtual pipeline: truck / ship loading, temporary storage |
| Automation level | Mature, highly automated process |
Green Energy from Organic Waste
Liquid biomethane comes from biogas, which is produced from organic waste. It is a green, clean energy. Replacing fossil fuels with liquid biomethane helps reduce greenhouse gas emissions and supports a circular economy.
Note: Specific carbon emission figures depend on upstream biogas production and should be evaluated on a project basis.
From Waste to Energy
Organic waste is collected and processed to produce biogas through anaerobic digestion. This biogas is then upgraded via membrane separation to obtain high-purity biomethane. The biomethane is subsequently liquefied into Bio-LNG (Liquid Biomethane), which can be used as a renewable fuel for transport, industry, and power generation. The entire loop closes the carbon cycle, turning waste into a valuable energy resource while reducing landfill use and methane emissions. This is the essence of a circular economy.
What is the typical purity after pre-treatment?
Molecular sieve adsorption achieves CO2 < 50 ppmv and H₂O < 0.1 ppmv, completely eliminating freeze-up risks.
What liquefaction technology do you use?
Industry-proven Mixed Refrigerant Cycle (MRC) with a brazed aluminum plate-fin heat exchanger-ideal for small to medium-scale plants
Can I transport Bio-LNG without a pipeline?
Yes. Our system supports a virtual pipeline: liquid biomethane is stored in cryogenic tanks and moved by truck or ship.
What is the volume reduction compared to gaseous biomethane?
Liquefaction at -162°C reduces volume by approximately 600 times, dramatically cutting storage and transport costs.
Biogas Technology
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Why Liquefy Biomethane?- Key Benefit
