Experimental evaluation and thermodynamic modeling of hydrate selectivity in separation of CO2 and CH4.

Azimi, Alireza; Mirzaei, Masoomeh

In this work, Experimental evaluation of hydrate selectivity in CH 4 and CO 2 separation has been done. For this purpose, experiments were conducted at different temperatures, pressures, and concentrations of mixture. The gas mixture hydrate was formed in a batch visible system and the crystallization induction times for CH 4 and CO 2 hydrates were determined. Due to different induction times, hydrate formation can be used as a suitable method to separate CH 4 and CO 2 in the mixture. According to empirical data, induction time increases with increasing concentration at constant temperature. Moreover, the effect of initial pressure, temperature, and concentration of CH 4 in the feed on hydrate selectivity was studied and a mathematical correlation was proposed for predicting hydrate selectivity in the temperature, pressure, and CH 4 mole fraction ranges. According to experimental results, hydrate formation is capable of increasing methane purity up to 0.94.

CRYSTALLIZATION; GAS mixtures; MOLE fraction; HYDRATES; STATISTICAL correlation

Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2016, Vol 111, p262

0263-8762

Academic Journal

10.1016/j.cherd.2016.05.005