活性炭中甲烷水合物的分解动力学  

Kinetics of Methane Hydrate Dissociation in Active Carbon

作　　者：刘犟[1] 阎立军[1] 陈光进[1] 郭天民[1] 

机构地区：[1]石油大学油气藏流体高压相态及物性研究实验室,北京102200

出　　处：《化学学报》2002年第8期1385-1389,共5页Acta Chimica Sinica

基　　金：国家自然科学基金 (No .2 0 1760 2 8)

摘　　要：在封闭体系内 ,在初始分解压力 0 1MPa ,温度范围 2 76～ 2 6 5K之间 ,测定了五组甲烷水合物在活性炭中的分解动力学数据 .分析了甲烷水合物在活性炭中分解的物理过程 ,提出了以微分方程表达的宏观分解动力学模型 .使用单步积分的吉尔 (Gear)方法解得微分方程的数值解 ,结合单纯形最优化方法拟合模型参数 ,模型计算值与实验值符合良好 .The experiment was designed to use isothermal depression method to research the dissociation kinetics of methane hydrate in active carbon. Five groups of kinetic data (P similar to t) of methane hydrate dissociation in active carbon were obtained in the temperature range of 276 similar to 265 K and at the initial dissociation pressure of 0.1 MPa. A three-phase ( gas-water-hydrate) depressurization kinetic model was developed for hydrate dissociation in active carbon, in which a key concept of 'porous plate' was proposed. It is assumed that the diffusion of methane in the porous plate is the control step in the process of hydrate dissociation when the temperature is below ice point. The numerical solution of this model is obtained by Gear single-step extrapolation method. The simplex optimization method is used to fit the model parameters. The model provideds a satisfactory fitting to the experimental data. According to the experimental data, the active energy of dissociation reaction of methane hydrate is E = 89.8 kJ (.) mol(-1) in the temperature range of 273 similar to 265 K.

关 键 词：甲烷水合物 活性炭 动力学 分解 天然气水合物 本征动力学方程 

分 类 号：O643.1[理学—物理化学]