CO₂ Absorbing Capacity of MEA

Table 1

Recommended values for variables to be monitored during bubbling tests.

Variable	Resolution	Range	Uncertainty; % FS	sensibility	Observations	This work for CO2    of MEA
Gas composition	<0.5% of pollutant inlet concentration	0–100% of pollutant inlet concentration	0.5 for CO2	34%	(i) Use well accepted methods for determining pollutant concentration in the gas stream; (ii) Avoid using gases with third components that could also be absorbed by the solvent	(i) 13% CO2, 87% N2; (ii) 21% CO2, 15% CH4, 64% N2; (iii) 100% CO2
Gas flow	0.1 SLPM	0–2 SLPM	0.2	52%	(i) Use mass flow meter; (ii) Ensure gas residence time >60 s	0.1–1.0 SLPM
Temperature	0.5°C	ND	0.5	3%	Ensure constant temperature within ±2°C in the bubbler using a proper water bath	25 ± 2°C
Pressure	1 kPa	ND	0.5	10%	ND	101.3 kPa
Time	1 s	ND	0.5	<1%	ND	0–7200 s
Pore size	ND	ND	ND	ND	1 μm	1 μm
Bubbler size	ND	ND	ND	N/D	(i) 1 L; (ii) Ensure no leaks	1 L
Amount of solvent in the bubbler	ND	ND	ND	N/D	0.5 L	0.5 L
Solvent Dilution	0.5%	0–50%	ND	Figure 3	(i) Use analytical grade solvent; (ii) Express dilution as weight to weight percentage	0–30% (w/w)

ND: not defined; FS: full scale.