The solubility of phenylphosphinic acid (PPA) was measured
for
the first time in supercritical carbon dioxide (SCCO2)
at 313, 323, and 333 K with pressure ranging from 10–20 MPa
using a dynamic flow technique. The solubility of PPA in neat SCCO2 ranged from 0.1 × 10–5 to 18 ×
10–5 mol/mol. The influence of cosolvent, methanol,
on solubility behavior was studied by measuring the solubility of
PPA in SCCO2 + methanol medium (1 and 4 mol % methanol)
at 313 and 323 K with pressure varying from 10–20 MPa. The
highest solubility of PPA in the SCCO2 + methanol mixture
is 29.4 × 10–4 mol/mol at 313 K and 20 MPa
with a methanol composition of 4 mol %. The solubilities in neat SCCO2 were correlated using different semiempirical equations (Mendez–Teja,
Chrastil, and Bartle) with an average deviation of <10%. The solubility
in the presence of methanol was correlated with four semiempirical/empirical
models (modified Chrastil, modified Mendez–Teja, Garlapati
model, and Jouyban equation); among these models, Jouyban model resulted
in better correlation with an average deviation of 5%.
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