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The amount of H2 gas generated at 4.75 A is ( 1/2moleH2 )(60sec)(4.75A) = 0.0015moleH2 (28) 96,487 A - sec min min Under these theoretical conditions, the molar ratio of H2 and CO2 is 0.32. Increasing the current increases the molar ratio of hydrogen to carbon dioxide with no effect on the operation of the acidification cell. H+ generated will either exchange with Na+ in the seawater to further lower its pH or migrate through the IX compartment and into the cathode compartment where it will combine with OH- to form water. 5.0 RESULTS AND DISCUSSION In the first test of the feasibility studies, the Nalco cell (Table 1) was configured such that strong acid cation exchange resin was used to fill both the ion exchange compartment (IX) and the electrode compartments (Figure 2). IO-1 seawater was used as the influent, and passed through the IX compartment at 140 ml/min for 165 minutes. The rate of dionized water through the electrode compartments was increased to a final flow rate of 140 mL/min. The results summarized in Table 3 show that when 3 amps of current where applied to the cell, the pH of the effluent seawater was between 2.08 and 2.15. As the current was decreased from 3 to 0.25 amps, the pH of the effluent seawater was increased to 5.88. These results demonstrate that the pH of the effluent seawater can be lowered using the acidification cell as it is configured and it is proportional to the applied current. The results also demonstrate the electrolytic regeneration of the cation exchange resin. The flow rate to current ratio when the seawater pH was 5.88 is estimated to be 560 by the following data: Table 3 Data: 140 mL/min/0.25 amps = 560 This ratio is higher than the theoretical ratio of 267 calculated for the same conditions as described in equation 25 as: 1000 mL/min/3.75 amps = 140 mL/min/X X= 0.525 Amps Theoretical Ratio: 140 mL/min/0.525 amps = 267 This indicates that the HCO3- levels in the IO-1 synthetic formulation may not be at the correct concentration, even though the pH was high. The recovery was at 50% and not lowered in this experiment. The term “recovery” is used to define the ratio of product quantity (influent seawater flow rate, Table 3) over the total feed quantity to the cell (influent seawater flow rate and influent dionized flow rate, Table 3) as a percent. This is critical since the water required in the electrode compartments must be dilute and free from hardness ions. This type of water must be treated by a filtration process such as reverse osmosis. A high recovery will allow the size of the filtration unit along with the energy requirements for the unit to be minimized. 11PDF Image | CO2 from Seawater
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