Data di Pubblicazione:
2017
Citazione:
Production and Application of O2 enriched air produced by water desorption in chemical plants / C. Pirola, G. Bozzano, D. Previtali, C.L. Bianchi, F. Manenti, F. Galli. ((Intervento presentato al 12. convegno Conference on sustainable development of energy, water and environment systems (SDEWES) tenutosi a Dubrovnik nel 2017.
Abstract:
The paper proposes the assessment of a new technology in chemical plants for gas mixtures
separation, using the enrichment in oxygen of air as appealing case study and proposing its use
for new intensifications in industrial chemistry where the advantages using oxygen enriched air
(EA) instead of simple air as oxidizing agent are of great potential.
This operation is based on an absorption-desorption process in which the different solubility of
incondensable gases in a liquid, water as first, is exploited to perform the enrichment of one
compound in the gas mixture. In particular, EA can be obtained by desorption from water, taking
advantage of the higher oxygen solubility in water compared to the nitrogen one. Water can be
degassed as it is or after a solubilisation tank working under pressure to increase the amount of
dissolved gas. When water is in equilibrium with atmospheric air, it contains different amounts
of dissolved O2 and N2 depending on the temperature and pressure.The idea is to take water in
equilibrium with atmosphere at low temperature and to degas it changing T and P conditions. In
fact, by increasing the temperature or decreasing the pressure, the content of both N2 and O2 in
water decreases due to their consequent release into the gas phase. The amount of the so extracted
incondensable gases can be collected for several uses rather than venting them in open
atmosphere. The main drawback of this application might be the limited amount of oxygen and
nitrogen in water and then the high quantity of water required for the great part of chemical
process. This problem can be solved by adding a pressurized tank in which water and air are put
into contact and then the exiting water, with high amount of dissolved gas due to the pressure
action, can be degassed. Depending on the applications and on the amount of EA required, it will
be possible to degas water equilibrated with air at room pressure, or under different pressures.
Moreover, the same water, after its degassing can be further recycled getting it in contact with
new atmospheric air. Positive results have been already experimentally collected and confirmed
by simulation, with a continuous production of EA (about 0.4 Nl/h for 30 l/h of water equilibrated
at room pressure, with about 30% of oxygen content).The study, optimization and integration of
this technology in industrial plant will be presented.
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
C. Pirola, G. Bozzano, D. Previtali, C.L. Bianchi, F. Manenti, F. Galli
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