文档介绍：CleaCleanniingng ttiionon
-------- Production of anic acid and base
twxu Green technology and BP process
CleaCleanniingng ttiionon
-------- Production of silicic acid (H2SiO3)
Conventional process---
Ion exchange method:Energy consumption >1 kwh/kg products
Bipolar membrane
electrodialysis(BPE):Energy consumption > kwh/kg products; Operation conditions :
2
V=-4V(I=10-12 mA/cm ), h=55-75%, Sio2=6-10%, pH=3.
twxu Green technology and BP process
CCeellll aarrrrananggeemmenenttss ooff icic acacidid
ttiionon
twxu Green technology and BP process
CleaCleanniingng ttiionon
---- Production anic acid
C
o
n
v
e
n
t
i
o
n
a
l

p
r
o
c
e
s
s
B
i
p
o
l
a
r

p
r
o
c
e
s
s
twxu Green technology and BP process
PPililotot ttestest----onfonfiigugurraattiiononss ofof cicittrricic
aciacidd ttiionon
10
A-C-BP-A-C
h

8
, C-BP-C
y
)
c
g BP-C-BP
n
k
e /
i
h 6
c
i
W
f
k
f
(

e

E
t
n A-C-BP-A-C 4
e
r C-BP-C
r
u BP-C-BP
C 2
0 50 100 150 200 250 0 25 50 75 100 125
-2
Time (min) Current density ( )
Current efficiencies for citric acid production Energy consumption for the production of
versus time at i=100 -2. citric acid production versus current density.
Refs:XuT W et al, Chem. Eng. process, 2001, in press
XuT W et al, J Membr. Sci., 2001, revised
twxu Green technology and BP process
PPililotot ttestest----ResResuullttss ofof cicittrricic acidacid
15

)
1
-
h

g
, 10
k
y
.
c
n h
e
i
w
c
i
k
f
(
f
5
e

t E
n
e
r
r
u
C 0
0 50 100 150
-2
0 50 100 150 200 Current density ( )
Time (min) Energy consumption for the production of
Current efficiencies for citric acid production citric acid production versus current density.
versus time at i=100 -2.
Na3Cit, Na2SO4; Na3Cit, 0