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Here’s a comparative study of different types of molecular sieves used for CO₂ removal from raw biogas for Compressed Biogas (CBG) production. Selecting the right molecular sieve depends on the biogas composition, desired methane purity, and the operational constraints of the upgrading system.   Key Types of Molecular Sieves   Type Pore Size Primary Application Advantages Limitations 3A Molecular Sieve 3 Å Water removal (dehydration). Excellent for removing water vapour before CO₂ removal. Ineffective for CO₂ adsorption due to smaller pore size. 4A Molecular Sieve 4 Å CO₂ and water removal in dry biogas streams. Selective adsorption of CO₂ and water. Not suitable for biogas with high H₂S or other impurities. 5A Molecular Sieve 5 Å CO₂ removal and separation of hydrocarbons. ...

  Comparison of Water Scrubbing , Bio-scrubbing , Ferrosorp , Chemical Scrubbing , and Iron Wool for H₂S removal from raw biogas : 1. Principle Parameter Water Scrubbing Bio-scrubbing Ferrosorp Chemical Scrubbing Iron Wool Mechanism Physical absorption of H₂S in water Biological oxidation of H₂S to elemental sulphur Adsorption of H₂S on iron oxide-based media Chemical reaction with scrubbing solution Reaction of H₂S with iron to form FeS 2. Efficiency Parameter Water Scrubbing Bio-scrubbing Ferrosorp Chemical Scrubbing Iron Wool H₂S Removal Efficiency 90-99% (depends on water solubility and pressure) 95-99% (depends on bacterial activity) 90-99% (depends on sorbent capacity) 99 5-99 9% (very high for low ...