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Equilibrium Studies on the System H2O-H2O2-CO(NH2)2-C3H8

Authors :: Gao, Yu Ming
Cao, Ji Lin
Chen, Pan Pan
Guo, Hong Fei
Tan, Zhao Yang
Source :: Advanced Materials Research; May 2011, Vol. 233 Issue: 1 p1690-1693, 4p
Publication Year :: 2011
Abstract: The phase equilibrium of the quaternary system H<subscript>2</subscript>O-H<subscript>2</subscript>O<subscript>2</subscript>-CO(NH<subscript>2</subscript>)<subscript>2</subscript>-C<subscript>3</subscript>H<subscript>8</subscript> with gas hydrate formation had been studied at high pressure and low temperature. The temperature and pressure of gas hydrate formed from different hydrogen peroxide concentration aqueous were determined at adding surfactants and no surfactants separately. It was concluded that the equilibrium pressure of gas hydrate formation was increasing with the increase of the hydrogen peroxide concentration, the urea concentration and the temperature, the mother liquor amount entrained in the gas hydrate after liquid separation by sinking was very high when surfactants was not added, but the equilibrium pressure of gas hydrate formation was decreased and the mother liquor amount entrained in gas hydrate was also decreased when surfactants was added to the system. In addition, the equilibrium pressure of gas hydrate formation in the quaternary system H<subscript>2</subscript>O-H<subscript>2</subscript>O<subscript>2</subscript>-CO(NH<subscript>2</subscript>)<subscript>2</subscript>-C<subscript>3</subscript>H<subscript>8</subscript> 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.