Captura de CO2 em mistura multicomponente utilizando microrreatores
The natural gas associated with the oil extracted from the pre-salt layer presents expressive CO2 contents (>30 mol%), which makes it unfeasible to market directly from the platforms. Thus, CO2 must be removed from the natural gas at least to the concentration required by the ANP, maximum of 3...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25290 |
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| Resumo: | The natural gas associated with the oil extracted from the pre-salt layer presents
expressive CO2 contents (>30 mol%), which makes it unfeasible to market directly from
the platforms. Thus, CO2 must be removed from the natural gas at least to the
concentration required by the ANP, maximum of 3 % mol/mol, to make it commercial.
The microreaction system has reached great interest in the last decades due its capacities
in the process intensification. In this configuration, the process occurs continuously, with
the reactions and the transfer phenomena happening in the individualized form with
maximum gradients. A feature to be highlighted in these reactors, compared to
conventional chemical reactors, is the higher surface area / volume ratio, which favors a
higher yield, selectivity and energy efficiency of the reaction. In this work, the CO2
absorption process in water and amine (MEA) was studied in different kinds of
microreactor (System T, Funnel-type microreactor, Type T microreactor and
Microreactor Junction T) and evaluated in different gas phase compositions (with N2/CO2
and N2/CO2/CH4). Also, experiments were performed under operational conditions with
different gas / liquid volumetric ratio. The microreactors evaluated had a hydraulic
diameter between 0.28 and 1.5 mm and were operated at atmospheric pressure and at
room temperature. The microreactor system has pumps, valves, microreactor,
microseparator, pressure and temperature sensors, and a chromatograph connected in line
to analyze the composition of the gas mixture at the system outlet..In general, the flow
regime was slug, and the results indicated that the maximum CO2 removal efficiency
using the T-junction microreactor occurred with removal efficiency greater than 90%
using water as solvent with gas / liquid volumetric ratio of 7:30. The efficiency was 100%
when was used MEA solution with concentration above 0.5 M in all operational condition
studied. |
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