Semi-clathrate growth experiments were performed using a carbon dioxide-water-tetra-n-butyl ammonium bromide system. Experiments were conducted in a semi-batch stirred tank crystallizer at temperatures of 287, 288, and 289K with a 3-K subcooling at each temperature. Gas consumption, temperature, hydrate former mole fraction, and particle size were measured throughout growth. Significant differences in gas consumption and heat effects were observed with these systems compared with pure clathrate systems. A kinetic growth model was applied to estimate the intrinsic rate constant. Rate constants did not show a clear trend with temperature at the conditions studied. Intrinsic reaction rate constant values ranged from 7.6x10(-6)m/s to 13.8x10(-6)m/s.