Environmental Engineering Reference
In-Depth Information
Table 6.9 The influence of reaction temperature for the yield of PDADN
Number
Nitri
cation coef
cient
Reaction temperature/
°
C
Yield/%
1
2
15
-
20
50.45
2
4
15
20
70.35
-
3
6
15
20
80.36
-
4
8
15
-
20
82.10
5
10
15
20
82.10
-
6
12
15
20
82.09
-
8, the yield does not increase any more. So the best nitri
cation coef
cient is 8, the
mole ratio of HNO
3
to PA is 8:1.
(3) The in
fl
uence of reaction temperature for the yield of PDADN
Nitri
cation reaction is heavily in
fl
uenced by temperature. The nitri
cation yield
is studied with
fixed nitri
cation coef
cient and under different temperatures. The
results are in Table
6.10
.
From Table
6.10
, the yield of PDADN rises following the temperature increase.
But after the temperature is higher than 20
C, the yield does not increase any more.
Study also found that when the temperature is higher than 25
°
C, the yield
decreases a little. According to the literature, when 1,3-diazido-2,2-propandiol is
nitri
°
cated under high temperature, the azido groups react to nitrate groups.
5to
−
5
C is the proper temperature range to obtain 1,3-diazido-2,2-diitrate propane. It is
predicted that when temperature is higher than 25
°
°
C, azido groups of PA probably
change to nitrate groups. The best nitri
cation temperature of PA is 15
20
°
C.
-
6.4.2 Properties and Preparation
of 1,3-Diazido-2-Nitryloxypropane
The danger level of nitroglycerine is very high. NG is the only way, and there is no
researcher to reform NG now [
37
], especially the further azidization.
Table 6.10 The in
fl
uence of reaction temperature for the yield of PDADN
Number
Nitrification coefficient
Reaction temperature/
°
C
Yield/%
1
8
0
5
50.38
-
2
8
5
10
72.87
-
3
8
10
-
15
80.25
4
8
15
20
82.10
-
5
8
20
25
82.06
-
6
8
25
-
30
81.50
7
8
30
35
80.48