chemical physics of discharges - Argonne National Laboratory

I
I
t
I,
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downstream from the discharge to ensure proper dispersal of
spray in the electrode gap. The C-type reactor employed a
pair of rectwar electrodes so set in the gas flow as to
avoid reactant by-passing. "ne use of D.C. power,
necessitated stabilization of the discnarge by means of a
resistive load in the electrical circuit. Provision was
made to admit liquid spray into the inlet gas stream using
the same aerosol generator used in tile type-B reactors.
Table 1.
Reactor units employed.
Type
Reactor Flow Area Discharge Discharge Uilectic
CoGe cm 2
I idth rjarr ie r
cm c1n cm
Tubular 81
Centrifwal A2
Fi3.m ileactor A3
A4
2.203
II
II
n
1.270
0.254
0.127
0.040
2.798
0.560
0.280
0.089
0.15875
II
II
II
rubular
Spray Reactor
B1
62
1.089
II
la270
0.254
1.383
0.277
It
II
Used
Reactor
c1 1.4U 0- 635 0.896 0
"O1Y "hicme ss
gmJLTs:.
Hydrazine yields for the various reactor geometries and
the operating variables employed are given in Figs. 2 tm 6.
From the data presented in rig 2 to 4, it is evident that the
yield varies inversely as an exponential function of the
*lower density at pressures under l0Umm of mercury. The effect
of pressure also follows a Regative exponentid variation
therefore a general equation of the form
Y = a exp (-W-cv)
adequately describes the results. Of course this correlation
of the results does not in any sense give a complete
description of the underlying pnysical chemistry involved in
the synthesis. Ideally,it would have been preferable to
develop separate rate equations in terms of the partial
pressures of tne various components in the overall hydrazine
1 synthesis. This would have necessitated a complete product
analysis and since,in the present case,these data are lacking
the phenomenological approach had to be used. The constants
the equation for tne various reactors acd operating
conditions used were evaluated using the method of least
squares (12). These are tabulated in Table 2. It should be
noted in this Table tnat certLin pressure exponential values
were bracketed. here the relevant data were lacking for
c&cdat&n and ,therefore, the dependence of energy yield upon
preesurefdeactors A2 to A4 and B2 were assumed to be the
eane RS those found experimentally for Reactors Al and B1.