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高压低温条件下H2O-H2O2-CO（NH2）2-C3H8四元体系相平衡热力研究
O Study on Phase Equilibrium and Thermodynamics F the System H2O-H2O2-CO（NH2）2-C3H8 at High Pressure and Low Tempreture
【作者】 高宇明；
【导师】 曹吉林；
【作者基本信息】 河北工业大学 ， 化学工艺， 2011， 硕士
【摘要】 过氧化尿素应用广泛,然而生产过氧化尿素后的剩余母液循环利用,仍然是一个需要解决的难题。为了开发气体水合物法浓缩分离过氧化尿素剩余母液的新方法,在高压低温条件下,对H2O-H2O2-CO（NH2）2-C3H8四元体系形成气体水合物的相平衡进行了研究。实验测定了在273.15K和274.15K条件下,不同浓度过氧化氢、尿素的水溶液中形成气体水合物的相平衡条件。研究发现,随着过氧化氢、尿素浓度和温度的升高,气体水合物的平衡压力也升高。形成的气体水合物在自然沉降分离掉液体后,气体水合物的母液夹带量很高。在H2O-H2O2-CO（NH2）2-C3H8四元体系中加入表面活性剂十二烷基硫酸钠后,可以降低水合物的平衡压力、缩短形成水合物的诱导时间,并且显著降低形成气体水合物的母液夹带量。利用Chen-Guo模型,结合UNIFAC方程和Aasberg-Peterson逸度系数模型,分别对H2O-H2O2-CO（NH2）2-C3H8四元体系和添加十二烷基硫酸钠的四元体系进行了热力学模拟计算,最终得到的计算结果和实验结果相吻合,相对误差也维持在5%以内。此外,实验考察了表面活性剂含量、混合添加剂配比和转速大小对水合物生成的影响。
【Abstract】 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.
【Key words】 gas hydrate； hydrogen peroxide； urea； propane； phase equilibrium； Chen-Guo thermodynamics model；