Methane plus propane structure II hydrate formation kinetics

被引:45
作者
Kini, RA [1 ]
Dec, SF [1 ]
Sloan, ED [1 ]
机构
[1] Colorado Sch Mines, Ctr Hydrate Res, Golden, CO 80401 USA
关键词
D O I
10.1021/jp040301l
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The growth rates of methane (CH4) + propane (C3H8) structure II (sII) hydrates were measured via C-13 NMR in a custom-built nonspinning probe. The CH4 + C3H8 hydrate surface reaction growth data suggested that the large cages occupied by C3H8 formed twice as fast as small cages filled with CH4, although there were half as many large 5(12)6(4) cages as small 5(12) cages in a sII unit cell. Growth rates were measured at 269 K as a function of ice particle size ranging between 150 and 1180,mum, and vapor pressure in the range 0.34-0.84 MPa. A hypothesis based on low occupancy of sII small cages was presented to explain faster growth of large cages. A simple surface reaction model, which related growth rate to pressure and particle size, was developed.
引用
收藏
页码:9550 / 9556
页数:7
相关论文
共 32 条
[1]  
[Anonymous], 2000, THESIS COLORADO SCH
[2]  
[Anonymous], 1986, CRC HDB CHEM PHYS, P1986
[3]  
BALLARD AL, 2002, FLUID PHASE EQUILIBR, V371, P194
[4]  
BARRER R, 1967, P R SOC LONDON, pA300
[5]  
CHRISTIANSEN RL, 1995, P ANN GPA C 74, P14
[6]  
CHRISTIANSEN RL, 1994, P INT C NAT GAS HYDR, P283
[7]   MEASUREMENT OF C-13 CHEMICAL-SHIFTS IN SOLIDS [J].
EARL, WL ;
VANDERHART, DL .
JOURNAL OF MAGNETIC RESONANCE, 1982, 48 (01) :35-54
[8]   KINETICS OF FORMATION OF METHANE AND ETHANE GAS HYDRATES [J].
ENGLEZOS, P ;
KALOGERAKIS, N ;
DHOLABHAI, PD ;
BISHNOI, PR .
CHEMICAL ENGINEERING SCIENCE, 1987, 42 (11) :2647-2658
[9]   GIBBS FREE-ENERGY ANALYSIS FOR THE SUPERSATURATION LIMITS OF METHANE IN LIQUID WATER AND THE HYDRATE-GAS-LIQUID WATER PHASE-BEHAVIOR [J].
ENGLEZOS, P ;
BISHNOI, PR .
FLUID PHASE EQUILIBRIA, 1988, 42 :129-140
[10]   KINETICS OF GAS HYDRATE FORMATION FROM MIXTURES OF METHANE AND ETHANE [J].
ENGLEZOS, P ;
KALOGERAKIS, N ;
DHOLABHAI, PD ;
BISHNOI, PR .
CHEMICAL ENGINEERING SCIENCE, 1987, 42 (11) :2659-2666