the atomic energy organization of iran (aeoi) a-10!1!50-552728c
TRANSCRIPT
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7/31/2019 The Atomic Energy Organization of Iran (AEOI) a-10!1!50-552728c
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J. of Nuclear Sci. and Tech.
5350-431389No. 53, pp. 43-50, 2010
Sci. and Tech. note
HF
*12
2
1
-1 -11365-4563:
2- 11365-8486:
.:
.)(
HF.
.30.
.
.
9/125/160/34.
:
Equilibrium Curve Determination of HF Adsorption by Activated Carbon
H. Bahrami*1,2, S.J. Safdari2, S.M.A. Mousavian1
1- Department of Chemical Engineering, Faculty of Engineering, University of Tehran, P.O. Box: 11365-4563, Tehran-Iran
2- Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486,Tehran Iran
Abstract:One of the byproducts of uranium enrichment industry is hydrogen fluoride gas. Due to thetoxicity and corrosivity of the molecule, it has adverse effects on the environment and the process.
Therefore, it must be removed by adsorption towers. The activated carbon is one of the proposed sorbentfor the adsorption. Hydrogen fluoride adsorption equilibrium curve gives important information for
designing the adsorption towers. In this article, the hydrogen fluoride adsorption and adsorption factors
were determined experimentally, and four different types of carbon have been used. The operating
pressure in all tests was less than 30 mbar. Comparison between the obtained experimental equilibrium
curves shows that the first, second and fourth types of activated carbon are suitable for the adsorption ofhydrogen fluoride. The experimental data were fitted using mathematical models of Longmuir,
Freundlich, Toth and Henry. The results show that Toth mathematical model is more suitable than other
models. Also, the absolute error were predicted by the model of Toth for the first, second and fourth
types of the activated carbon were 12.9, 16.5 and 34 percent, respectively.
Keywords: Hydrogen Fluoride, Adsorption, Activated Carbon, Equilibrium Curve, Isotherm,Uranium Enrichment
:[email protected]*email27/2/89:31/5/88:
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HF
44
1-
.
.
UF)6(.
.]1[
.
.
.
.]2[
.
.
.
.
.)1(
.
.
.
.
.
.
.]34[
]5[)2(
]6[]7[
]89[.
]101112[.]10[
.
.]11[
.
.]12[
.
.]1314[
.
.
.
.
-
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531389
45
.
.
. 30.
2-
2-1
1.
-
:
.- :
.- :
10001/010001/0
.
- :.
- :HF.
- :HF
.
-HF2N:HF98/9999/99.
.
- : .HF
369/0 245/5.
1.
1-.
1-
(mm)
)3(kg/m
)g/2(m
)
(
3530-48011001
4510-46011001
4560100012
5/242011001
2-2
HFHF .
..
..
)1(
2
112
V
VPP =
1P1V2P2V.
. )2(
]15[
PlPl
10mbar 1000mbar SV1
Reservoir Tank
Vacuum Pump
N.V.e N.V.Micro Valve
N2 HF
SV3
Adsorbent Vessel
Tl
SV2
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HF
46
)2(TR
MVPm =
MV)(P)(
T)(R31/8((.)2(
.
.
.30
) (51020304060
.
. )1SV2SV3SV(1
02/0
. .)1SV(
.
0003/0
.)3SV(
51020304060.
)2SV()3SV(
. .
.
3-
.)245/25(
3025
.
]1617[.
)3(nkPq
1
=
q
PKn.
n=1.
)qP(
)4(q HP=
2-.
3-.
2 4 6 8 10 12 14 16 18 20 22
20
40
60
80
100
120
Experimental at 25.5 C
Toth
Second type of activated carbon
q(gradsorbate/kgactivatedcarbon)
P (mbar)
2 4 6 8 10 12 14 16 18 20 22
20
40
60
80
100
120
Experimental at 24 C
Toth
First type of activated carbon
q(gradsorbate/kgactivatedcarbon)
P (mbar)
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531389
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4-.
.-5
.
.
.
.
. bqm
)5(
1
mq bP
q
bP
=
+
)6(
( ) tt t1
t
t
t
Pb
Pmq
+
=
2.
2-
T(oC)
bqm(gr HF/gr carbon)
r-squareerror
%knr-squareerror%
240658/0.2239/09973/04/5802183/0718/19965/05/38
5/2505775/02924/09943/09/5301955/0595/19976/00/30
5/255-
10259/34/3129054/05/194003713/06747/09588/08/225
2507385/02363/09894/00/3701875/0488/19892/05/61
T(oC)btmtttr-squareerror%Hr-squareerror%24976/29421/03529/09980/09/12008492/09613/07/181
5/25432/38814/03834/09969/05/16007092/09731/05/153
5/257492/04/11806989/06168/01/31301018/09696/05/194
2539/102647/08807/09869/00/34007766/09355/01/198
2 4 6 8 10 12 14 16 18 20
20
40
60
80
100
120
140
Experimental at 25.5 C
Toth
Forth type of activated carbon
q(gradsorbate/kgactivatedcarbon)
P (mbar)
2 4 6 8 10 12
20
40
60
80
100
120
140
160
Experimental at 25 C
Henry
Third type of act ivated carbon
q(gradsorbate/k
gactivatedcarbon)
P (mbar)
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HF
48
HF
3024
2.2
.
.
.
.2
HF30
.
2.
.
.
9/12HF
.
HF
305/25
3.
3HF
.HF
.2
HF30
.
HF5/16
30.
4HF
30
.
.HF
.
.
1
.
HFHF
. HF6UF
2F2UO.
.
.
2
.
HF5
30
.23
HF
.
.
.2
.
HF0/34
.30
.
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531389
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HF6
.
.HF
.
HF
99
19
19
.HF
2
.2
1315
1315
.
HF7
.HF
.7
.
6- .
-7 .
-4
-
HF.
-
HF
.
-
.
-
.
:
1- Cold Trap
2- NOX
0 50 100 1500
50
100
150
% Abs. Error of first Carbon=12.9
%Abs.Error of second Carbon=16.5
%Abs.Error of forth Carbon=34.0
q(Model)
q (Experiment)
2 4 6 8 10 12 14 16 18 20 22
20
40
60
80
100
120
140
160
First type at 24 C
Second type at 25.5 C
Third type at 25 C
Forth type at 25.5 C
q(gradsorbate/kgactivatedcarbon)
P (mbar)
CC
CC
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