DISCO₂VERY

AB's CO₂ liquefaction technology allows carbon dioxide to be recovered from the biogas upgrading process and converted into liquid bioCO₂ suitable for the food industry.  A further addition to our wide range of technological solutions, to enhance the emission deriving from the RNG production process, transforming it into a valuable resource.

Our CO₂ liquefaction plants – DISCO₂VERY – comply with strict safety and environmental standards and use state-of-the-art technologies to optimize the energy efficiency, reliability and purity of the liquid CO₂ produced. Designed as a containerized and plug-and-play solution, they ensure rapid on-site installation and commissioning. 

CO₂ produced by biogas purification can be liquefied for transport to places of consumption: CO₂ injection into agricultural greenhouses, dry ice production, food processing industries, chemical industries, production of cooling liquids.

The addition of a CO₂ liquefaction plant to the RNG biogas upgrading system leads to an improvement in sustainability, revenues and CI score. 

The CI score measures the amount of carbon dioxide (CO₂) emissions produced per unit of energy or fuel consumed. It is a fundamental metric used to assess the environmental impact of various energy sources. A lower CI score indicates a lower amount of CO₂ emissions associated with the energy produced, which means a cleaner and more sustainable energy source. 

The CO₂ produced by the plant complies with European legislation in force on the subject (Regulation (EU) No. 231/2012 – Additive E290) and the ISBT (International Society of Beverage Technologists) international standard for the use of carbon dioxide in beverages.

The plant is based on an integrated cryogenic process divided into 5 phases: 

1. Treatment: In the first part of the process, the purification system eliminates contaminants and odours through an activated carbon filter system.

2. Compression: the gas is compressed to a pressure between 15 and 20 bar, depending on the customer's needs.

3. Drying: moisture is reduced by condensation and absorption on molecular sieves.

4. Cryogenic distillation: the foreign gases (CH₄, N₂, O₂) present in the incoming mixture are separated from carbon dioxide by means of cryogenic distillation technology, which makes it possible to obtain CO₂ with a content greater than 99.9% from the system, as required by the ISBT. 

5. Storage: The bio-CO₂ is conveyed to a storage tank where it will be maintained at the desired pressure and temperature conditions.