Survey of potential chlorine production processes. Final report Page: 95 of 199
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4.9.2.2 Scientific Basis
This patent invention involves the production of ircn oxide and chlorine
by combusting ferric chloride with oxygen. It describes a method to increase
the efficiency of the ferric chloride oxidation process in using two
combustion zones to generate chlorine. The overall chemical reaction in
the two zones is:
4FeCl3 + 302 2Fe203 + 6C12
At 25°C, this reaction is endothermic with a change in free energy of 5.3
Kcal/mole Cl2. The yield of chlorine is about one ten of chlorine for every
three tons of ferric chloride, or a 50 percent yield from theoretical.
4.9.2.3 Engineering
Figure 17 is a flow chart for this two-step process.
In the first reaction vessel, the oxygen and ferric chloride react at
a temperature between 650° and 1,000°C. The product in this first vessel
is an equilibrium mixture consisting of ircn oxide, chlorine, unreacted ferric
chloride and oxygen. The time spent in the first vessel must be sufficient
to attain equilibrium. The preferred operating temperature in the first
vessel is 700° to 900°C. In the second operating vessel, the temperature
is reduced. The reduction must be at least 25°C, but preferably between 50°
and 100°C. The temperature drop must be controlled, however, so that
conditions in the second vessel do not go below 450°C. This is dene so
that at least 75 percent equilibrium is attained. Once the mixture is
transferred to the second vessel, it undergoes another equilibrium change
at the reduced temperature. The new equilibrium is richer in both iron
oxides and chlorine. Less unreacted ferric chloride and oxygen appear in
the product of this second combustion zone.
4.9.2.4 Conclusion
This process was never commercialized due to its high energy require-
ments and operational problems and will not be further considered.
79
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Survey of potential chlorine production processes. Final report, report, April 1, 1979; United States. (https://digital.library.unt.edu/ark:/67531/metadc1101365/m1/95/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.