Abstract
In this work, the effects of tert-butyl peroxy-2-ethylhexanoate (TBPO) and the operating conditions on the separation of CO2 from a CO2/CH4 (67.0 mol %) gas mixture based on hydrate formation have been studied through experiments. The results showed that CO2 separation was effectively achieved by adding TBPO to aqua-solutions. The content of methane in the residual gas hiked when the gas/liquid volume ratio decreased. Methane concentration in the residual gas phase was increased from 67.0% to 89.6%, obtained when the initial gas/liquid volume ratio was 2.23 by one-stage hydrate separation with 26.0 wt % TBPO at 287 K and 2 MPa. The CH4 recovery was 0.91, and the CO2 separation factor was 17.01 by adding 5.0 wt % TBPO. Through the use of a hand pump to keep pressure constant for the residual gas in the vessel to form hydrates, CH4 concentration in the residual gas phase increased to as high as 93.3%.
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