| Urea peroxide were widely used, however, it was still a problem that recycling the residual liquid after the production of peroxide urea. In order to explore a new concentration method of low concentration hydrogen peroxide and the residual liquid of peroxide urea system by gas hydrate. In this paper, the system H2O-H2O2-CO(NH2)2-C3H8 were studied at high pressure and low temperature.At 273.15K and 274.15K temperature, solid-liquid phase composition and equilibrium pressure of clathrate compounds have been measured in the ternary system H2O-H2O2-CO(NH2)2-C3H8。The study found that on the condition of high pressure and low temperature, as hydrogen peroxide (urea) concentration and temperature increased, the equilibrium pressure forming gas hydrate increased too, after separating out the liquid by natural subsidence, entrainment of residual liquid of gas hydrate was at high level. Adding surfactants SDS to this system can reduce the equilibrium pressure of the formation of hydrate, shorten the time of hydrate formation, and reduce the mass of liquid entrained.Moreover, the equilibrium pressure of gas hydrate formation in the quaternary system H2O-H2O2-CO(NH2)2-C3H8 was calculated according to Chen-Guo thermodynamic model, improved UNIFAC mathematical equation and Aasberg-Peterson fugacity coefficient model . The calculated data was in agreement with the experiment data. In addition, the influence of the surfactant content, the mixed additives ration and the speed of stirring on the formation of gas hydrate was investigated. |
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