Chemistry Reference
In-Depth Information
s
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
Fig. 11.22
Summarized data on the kinetics of the homogeneous decomposition of hydrazine in
the liquid phase obtained by the Microdroplet method (
filled circles
), AVD method (
squares
),
manometric method with standard manometers and aluminum containers (
unfilled circles
), mano-
metric method developed by Prof. Nechiporenko (
diamonds
), thermography (
triangles
); data from
[3] obtained using mass spectrometry (
crossed circles
), data from [4] obtained using the high-
pressure manometric method (
crosses
)
A generalized Arrhenius plot including data obtained in this work as well as
literature data from [3] (obtained by applying mass spectrometry to the products)
and [4] (high-pressure manometry using
differential pressure mercury gauge) is
shown in Fig. 11.22.
The kinetics of the homogeneous decomposition of hydrazine does not change
over a wide temperature interval (
≈
240 deg) and an extremely wide range of the
rate constant (
≈
9 orders of magnitude). The expression for the rate constant is
10
6
.
0
±
0
.
2
exp
[
s
−
1
]
.
±
26800
800
k
= 5
×
−
(11.8)
R
T
An express method for evaluating the stability of hydrazine (using the Microdroplet
device) under long-term storage conditions was developed based on the kinetic data
Table 11.4
Kinetic constants for the heterogeneous decomposition of hydrazine on the surfaces of
construction materials
Material
Temperature,
◦
C
Preexponential
factor
k
0S
,
cm s
−
1
Activation
energy
E
,kJmol
−
1
Stainless steel H18N10T
30-260
13
66.7
Stainless steel 12H18N10T
40-130
380
76.7
Nickel-based alloy EI654
40-130
15
72.9
Stainless steel 12H21N51
40-130
29
72.1
Teflon film FT-4MB
50-95
25
82.9
Aluminum-based alloy AMG-6
50-130
12
90.8
