摘要：The paper has aimed at studying the transfer of indole 3-acetic acid (
IAA) from a feed aqueous solution to a stripping aqueous solution of
NaOH using a chloroform bulk liquid membrane and trioctylamine (
TOA) as a ligand (
L). Initial molar concentrations of
IAA in the feed phase,
c
IAA,F0
(10
–4–10
–3 kmol/m
3), of
TOA in the membrane phase,
c
L,M0
(10
–2 and 10
–1 kmol/m
3), and of
NaOH in the stripping phase,
c
NaOH,S0
(10
–2 and 1 kmol/m
3), were selected as process factors. Their effects on the final values of
IAA concentration in the feed phase (
c
IAA,Ff
) and stripping solution (
c
IAA,Sf
), extraction efficiency (
E
F
), distribution coefficient (
K
D
), and recovery efficiency (
E
R
) were quantified using multiple regression equations. Regression coefficients were determined from experimental data, i.e
.,
c
IAA,Ff,ex
= 0.02–1 × 10
–4 kmol/m
3,
c
IAA,Sf,ex
= 0.22–2.58 × 10
–3 kmol/m
3,
E
F,ex
= 90.0–97.9%,
K
D,ex
= 9.0–46.6, and
E
R,ex
= 66.5–94.2%. It was found that
c
IAA,F0
had the most significant positive effect on
c
IAA,Ff
and
c
IAA,Sf
, whereas
c
NaOH,S0
had a major positive effect on
E
F
,
K
D
, and
E
R
. A deterministic model based on mass transfer of
IAA was developed and its parameters, i.e
., mass transfer coefficient of
IAA-L complex in the liquid membrane (0.82–11.5 × 10
–7 m/s) and extraction constant (1033.9–1779.7 m
3/kmol), were regressed from experimental data. The effect of
c
L,M0
on both parameters was significant.
