Amine Scrubbing Technology

Ultra-high purity biogas upgrading technology using chemical absorption to remove carbon dioxide and hydrogen sulfide.

Ultra-High Purity Upgrades

Biogas Purification by Amine Scrubbing

Our advanced Amine Scrubbing CO₂ & H₂S Purification System is specially designed to remove Carbon Dioxide (CO₂) and Hydrogen Sulfide (H₂S) from raw biogas through a highly efficient chemical absorption process using an amine solvent solution.

The system selectively absorbs acidic gases such as CO₂ and H₂S, resulting in a purified methane-rich gas stream suitable for Bio-CNG production, power generation, industrial heating, and vehicle fuel applications.

Absorption Loop

1. Gas Absorption & Separation

1. Gas PressurizationRaw biogas from the digester is initially pressurized using a low-pressure blower to approximately 0.6 kg/cm²g to overcome system pressure drops.

2. CO₂ & H₂S Removal by Amine AbsorptionPressurized gas enters the Amine Absorber Column, contacting a Monoethanolamine (MEA) solution which selectively binds acid gases.

3. Methane-Rich Gas SeparationPurified methane-rich gas exits from the top of the absorber column while the CO₂ & H₂S-rich solvent goes to regeneration.

4. Gas DehumidificationMethane passes through a dehumidifier to separate condensable water vapors, improving downstream compression protection.

5. Methane Drying & CompressionDried high-purity Bio-CNG is compressed for vehicle cascades, cylinder bottling, or grid pipeline injection.

Regeneration Loop

2. Solvent Stripping & Recycling

6. CO₂ & H₂S Stripping (Amine Regeneration)The rich amine solution is heated inside a Stripper Column using steam from a boiler, releasing the bound acidic gases and restoring absorption capacity.

7. CO₂ Rich Gas Venting / RecoveryThe desorbed carbon dioxide gas stream can be safely vented or compressed for downstream industrial CO₂ applications.

8. Amine Cooling & RecirculationHot regenerated amine passes through a heat exchanger and cooler to drop to ambient temperature before returning to the absorber.

9. Heat Recovery SystemEnergy-efficient design recovers up to 60% of process heat for digester warming or hot water up to 55°C, reducing plant OPEX.

* MEA (Monoethanolamine) provides extremely fast absorption kinetics, making it ideal for systems requiring high gas throughputs.

System Parameters

Key Features & Performance Parameters

Operational parameters and features of chemical amine scrubbing technology.

Simultaneous Stripping

Removes both CO₂ and H₂S in a single column pass.

High Methane Purity

Consistently yields >99.5% methane concentration.

Minimum Methane Slip

Methane loss is restricted to less than 0.1%.

60% Heat Recovery

Process heat is recycled to warm anaerobic digesters.

Parameter	Typical Value
Methane Purity Output	> 99.5%
Methane Slip Loss	< 0.1%
CO₂ Removal Efficiency	Up to 99.8%
Inlet Gas Pressure	Near-ambient (~0.6 Bar)
Solvent Reagent	MEA / MDEA aqueous solutions
Heat Recovery Potential	Up to 60% of thermal inputs

Performance Comparison

Advantages of Amine Scrubbing Upgradation

Features and operational benefits of selecting chemical amine absorption systems.

Feature	Benefit
Ultra-High Methane Purity	Delivers grid-injection and automotive grade CNG exceeding 99.5% purity.
Minimum Methane Loss	Methane slip < 0.1% ensures maximum gas sales efficiency.
Simultaneous Acid Stripping	Eliminates need for separate CO₂ and H₂S scrubber towers.
Process Heat Recovery	Reduces thermal boiler demand, optimizing net operational expenses.
Solvent Regeneration	Amine chemical solvent is infinitely boiled and reused inside a closed loop.
Proven Industrial Scale	Highly reliable and stable performance for large-scale biogas setups.

Applications

Where Amine Scrubbers are Deployed

Standard upgrade configurations across diverse commercial sectors.

Bio-CNG Plants

Compressed Biogas (CBG) Projects

Renewable Natural Gas (RNG) Systems

Industrial Fuel Gas Applications

Vehicle Fuel Applications (Logistics fleets)

Power Generation Systems