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CO2 gas is usually produced in large plants and from a variety of sources and is delivered via an internal logistics network to the enduser. Power efficiency, reliability, quality and last but not least economical feasibility are of greatest importance, which ASCO meets with its wide range of products in regards to CO2 Production and Recovery Plants.
Be it from an alcoholic fermentation process, other industrial sources (e.g. ammonia or ethylene oxide production) or natural sources, ASCO finds your individual CO2 recovery solution.
The high-purity source with a CO2 concentration of > 95 % is the base for a high-economical CO2 production. Depending on this source the CO2 requires certain types of purification, before it is compressed and liquefied to become ISBT quality and is then stored in a designated tank.
The CO2 Stack Gas Recovery Plant enables to recover CO2 from flue gas production of boilers or other flue gas sources.
The flue gas is separated from sulphur compound in a CO2 washer (scrubber) before it is transported into the absorber where it is absorbed by the specially formulated ASCOSORB solvent. This ASCOSORB solvent is heated by the steam-controlled reboiler in order to separate the CO2 gas again.
When dry ice is produced the conversion rate from liquid CO2 to dry ice is approx. 40-45 %. This means 55-60 % is lost to the atmosphere. This conversion rate is a physical fact and therefore, unfortunately, not to change. With a CO2 Revert Recovery System, however, most of the CO2 can be recovered which leads to a final conversion rate of approx. 90-95 %. This way, the dry ice production costs are reduced up to 50 %.
This technology is based on the absorption of CO2 from flue gas into an aqueous monoethanolamine solution with the subsequent separation process by heating with a steam-controlled reboiler. The required CO2 quality according to the ISBT standards is reached after compression, purification and liquefaction of the gas produced.