ABSTRACT:

The conventional method for separating hydrogen and methane requires deep cooling, which would consume much more energy. Amid a lot of new technologies of separating gas mixture, the gas hydrate technology attracted more attention in recent years. Considering that separating of a gas mixture is usually carried out in a column reactor, the experiments on gas hydrate formation kinetics of methane in tetrahydrofuran (THF) aqueous solution were performed in a spray tower at pressures ranging from 1.12 MPa to 1.58 MPa and at temperatures of 277.6 K and 278 K in order to simulate the practical process of separating gas mixture by hydrate technology. The experimental results demonstrate that the hydrate formation rate is much higher in a spray reactor than in a stirred batch reactor. The kinetic model by Firoozabadi et al. was modified and coupled with the Chen-Guo hydrate model to predict the rate of gas hydrate formation for the gas mixture in a spray tower. The parameters for mixtures in the kinetic model were calculated directly from those of pure components which were determined by correlating experimental data in the stirred batch reactors. The study result could be of significance to the design of gas mixture separation process through hydrate technology.

INTRODUCTION

The rapid rise of the prices of crude oil and natural gas has raised interest in alternate energy resources. The abundance and availability of coal makes it a promising alternative energy source over oil or natural gas. Therefore, the interest in coal gasification has been renewed. The synthesis gas contains carbon dioxide, hydrogen, and methane. The conventional distillation method requires deep cooling, which would consume much more energy. Amid a lot of new technologies of separating gas mixture, the gas hydrate technology attracted more attention in recent years.

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