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Cryocondensation and activated carbon

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Cryocondensation and activated carbon

SIAD supplies cryocondensation and activated carbon adsorption plants for the treatment and purification of gaseous emissions containing pollutants of organic or inorganic nature whereby guaranteeing compliance with the law.

Cryogenic condensation with liquid nitrogen
The process of cryocondensation is based on the cooling of polluted effluents at extremely low temperatures, using liquid nitrogen as energy source.
The separation of pollutants is achieved thanks to the reduction of the vapour pressure at equilibrium concentration liquid/vapour or solid/vapour obtained at lowest possible cooling temperatures.
The effluent to be purified, polluted with organic or inorganic volatile compounds, is cooled gradually, in heat exchangers of particular configuration at temperatures lower than the dew point of such compounds, which are therefore removed from the gas phase by condensation as far as it is physically possible.
If their residual concentration in the effluent still results higher than the standard limits, the cooling of the gaseous flow continues until a further reduction of vapour pressure is reached. Adsorption on activated carbon with nitrogen regeneration
Adsorption/desorption units with activated carbon (or other adsorbent materials) of gaseous streams containing organic pollutants have been developed by SIAd using a new bed regeneration technique.
This consists in heating up the bed with nitrogen in a closed-circuit and then a vacuum desorption step in order to carry out a quantitative removal of adsorbed substances. The generated flux, characterised by a very small flow rate (about 1÷2% of the treated stream) but saturated with desorbed substances, is sent to the cryocondenser within which these substances are in turn quantitatively separated and recovered.
Thanks to the features of this new system, all the streams from the treatment unit, the main treated flow and those produced during regeneration steps are discharged into the atmosphere utterly pollutant-free.