Fig.4. Effect of the mean linear velocity on h3po4 concentration in exhaust gases

2) Effect of the operating temperature on the acid loss at a constant current density

Figure 5 shows the effect of operating temperature on the acid loss rate at 300 mA/cm2. The acid loss of the anode and cathode increases exponentially with an increase of operating temperature.

The concentration of phosphoric acid in the anode and cathode exhaust gases also increases exponentially, but they are smaller than the equilibrium concentration estimated from Brown's data0 as shown in Figure 6. Difference between the experimental data and the equilibrium data could be explained by the fact that the concentration of the phosphoric acid in the exhaust gases is affected by the mean linear velocity.

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