HYDRATE FORMATION OF A SYNTHETIC NATURAL-GAS MIXTURE IN AQUEOUS-SOLUTIONS CONTAINING ELECTROLYTE, METHANOL, AND (ELECTROLYTE PLUS METHANOL)

Hydrate formation has been studied for a synthetic natural gas mixture in pure water and in aqueous solutions containing electrolyte(s), met hanol, and a combination of (electrolyte + methanol). Special attentio n has been given to (electrolyte + methanol) systems, as such data are extremely scarce in the open literature yet are of industrial signifi cance. Sixteen experiments (a total of 107 data points) have been perf ormed in the temperature range of (260.8-281.9)K and pressure range of (0.54-11.18) MPa using the isothermal pressure search method. The gen eralized hydrate model proposed by Zuo et al. (1996) has been applied successfully to predict the measured data for aqueous systems containi ng pure water, electrolyte(s), or methanol. A simple exponential expre ssion is proposed to correlate the measured data for aqueous systems c ontaining both electrolyte and methanol. It was found that the additio n of methanol would affect the sequence of inhibiting strength of meth anol would affect the sequence of inhibiting strength of electrolytes.