Heat of Combustion of the Product Formed by the Reaction of Acetylene, Ethylene, and Diborane Page: 3 of 7
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2 NACA RM E53H18
In all cases there was a small amount of carbonization at the point
where the bulb was sealed off. This involved an insignificant amount of
material. Three of the six sample bulbs received were filled incompletely
and combustion could not be achieved in the Parr bomb.
APPARATUS AND PROCEDURE
The apparatus consisted of a Parr adiabatic calorimeter equipped
with an Illium constant-volume bomb and a mercury thermometer which could
be read to *0.0050 F. The procedure was identical with that described in
reference 2.
RESULTS AND DISCUSSION
The results of three determinations of the heat of combustion of
AEDB and the analysis of the combustion products are given in table II.
The heats of combustion are the gross uncorrected values determined
directly in the bomb with gaseous carbon dioxide, liquid water, and solid
boric acid as the combustion products and with part of the boric acid
dissolved in the water present in the bomb. Only runs 1 and 3 were used
to obtain the average value, since in run 2 a visual inspection of the
bomb showed that the combustion was not sufficiently complete. This gross
heating value was 21,719 e 150 Btu per pound. The determined percent car-
bon, as carbon dioxide, was much below the value reported by Callery
Chemical Company, while the boron analysis was only slightly below the
reported value.
To convert the uncorrected gross value to a corrected net value,
it was necessary to know the chemical composition of the compound. The
analysis obtained from the combustion process gave a B/C ratio of very
close to 1/2. The Callery value for active hydrogen indicated that there
are roughly two active hydrogens for two boron atoms, and it was further
considered that there are l1 inactive hydrogen atoms for each carbon atom
(the average for ethylene and acetylene). This results in the formula
B2C4H8 if it is considered that the hydrogen bridge structure remains in.
tact in the molecule.
The same type of corrections for converting the bomb value into a
corrected net heat of combustion was employed as in reference 2. For the
reaction
B2C4H8( ) + 7t 02(g) B203(s) + 4C02(g) + 4H20(g)*p,-1Ma~rs ~L II
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Tannenbaum, Stanley. Heat of Combustion of the Product Formed by the Reaction of Acetylene, Ethylene, and Diborane, report, October 24, 1957; (https://digital.library.unt.edu/ark:/67531/metadc64886/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.