Solubility of Nitrous Oxide in Amine Aqueous Solutions - Scientific ...

Table 2. Parameters in equation 4 for the solubility of N 2 O in pure alkanolamines.
a b c % Error
N 2 O-MEA -12 922 63 -0.0362 0.22
N 2 O-DEA 47 103 -305 0.5337 0.4
N 2 O-DIPA -24 129 128.6 -0.1423 0.65
Figure 3. Experimental and calculated solubility of N 2 O in pure MEA, DEA and DIPA.
3.3 Solubility of N 2 O in amine aqueous solutions
The measured solubilities of N 2 O in amine aqueous solutions over the temperature range (20 to 60)
o C are presented in Table 3. The concentrations of amine vary between 5% and 30% (w/w).
A semi empirical model proposed by Wang et al [17] was used to correlate the solubility of N 2 O in
amine solutions. In this method, the excess Henry's coefficient for the binary system has the
following form
= ln H − Φ ln H − Φ H
(5.)
( ) ( ) ( )
R
N O m A N O,
A W N O,
W
H
N O , m
, H
N O , A
, 2
2
2
ln
H ,
Where
, and
2
2
N 2O
W
are Henry’s constant of N 2 O in the amine aqueous
solution in pure solvent A and in water, respectively. Φ
A
, and Φ
W
are the volume fractions of
6