Charles E. Taylor, Jonathan T. Kwan's Advances in the Study of Gas Hydrates PDF

By Charles E. Taylor, Jonathan T. Kwan

ISBN-10: 0306484811

ISBN-13: 9780306484810

ISBN-10: 0306486458

ISBN-13: 9780306486456

This e-book had its genesis in a symposium on gasoline hydrates awarded on the 2003 Spring nationwide assembly of the yank Institute of Chemical Engineers. The symposium consisted of twenty papers offered in 4 periods over days. extra visitor authors have been invited to supply continuity and canopy themes no longer addressed throughout the symposium. fuel hydrates are a distinct classification of chemical substances the place molecules of 1 compound (the visitor fabric) are enclosed, with out bonding chemically, inside an open strong lattice composed of one other compound (the host material). some of these configurations are referred to as clathrates. The visitor molecules, u- best friend gases, are of a suitable measurement such that they healthy in the cage shaped by means of the host fabric. Commonexamples of fuel hydrates are carbon dioxide/water and methane/water clathrates. At average strain and temperature, methane hydrate comprises by way of quantity one hundred eighty instances as a lot methane as hydrate. the U.S. Geological Survey (USGS) has predicted that there's extra natural carbon c- tained as methane hydrate than all other kinds of fossil fuels mixed. in truth, methane hydrates may supply a fresh resource of strength for numerous centuries. Clathrate compounds have been first stumbled on within the early 1800s whilst Humphrey Davy and Michael Faraday have been experimenting with chlorine-water combinations.

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Thus, at longer times, hydrate particles will be a part of a continuous medium forming a hydrate bulk phase. Hence, the total surface area per volume of the particles will decrease and consequently the probability of interactions between the reactants will also decline. The low gas permeability of the hydrate and the low diffusion coefficient of methane in water are the key factors limiting the mass transfer and the hydrate reaction. Natarajan et al. [8] presented some induction data measurements for formation of methane, ethane, and carbon dioxide hydrates.

The reaction index, is not assumed to be equal to one. Rather, its value is determined by means of the experimental data. The departure from equilibrium can be expressed by either or These ratios will be equal to unity when equilibrium is attained. The ratio can be estimated using an equation of state for the gas phase. The water vapor pressure can be neglected and the gas phase is assumed pure methane. Further, can be estimated using an equation of state for the liquid system, but the mole fraction of the gas in the liquid cannot be determined at non-equilibrium conditions.

Carolina Gonzalez Chacin et al. the cell. The cell is finally allowed to warm slowly to a temperature between 10° C and room temperature, which causes the hydrate to release its absorbed methane gas. 1. Application of the Equilibrium Approach An example plot of the formation and dissociation results is shown in Figure 5 and the slope values for all of the runs are shown in Table 1. The slope differences between the formation and dissociation data are pronounced, while the slopes of the dissociation data and the predicted values are similar.

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Advances in the Study of Gas Hydrates by Charles E. Taylor, Jonathan T. Kwan

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