Measurement of CO2 hydrate film thickness based on mass transport mechanism

Dissolving CO2 into the ocean by the pumping of liquid CO2 is a strategy to offset the buildup of atmospheric CO2 However, under the high-pressure, lo w-temperature conditions in the deep ocean a CO2 hydrate film quickly isola tes the liquid CO2 from seawater thus: suppressing dissolution. The thickne ss of the hydrate film is one of the most important parameters for understa nding the mass transport mechanism through the hydrate film during the liqu id CO2 dissolution. We suggest a new method for measuring the thickness of the hydrate film formed at the interface between the liquid CO2 and flowing water. Our method assumes that a unique thickness of hydrate film is kept through hydrate dissolution and growth at the water-, and Liquid CO2-hydrat e interfaces, respectively. When growth stops, the net dissolution allows e stimation of the original hydrate thickness. Under the conditions of our ex periment, the CO2 hydrate film thickness is about 0.4 mu m.