Experimental and modeling studies on the hydrate formation of CO 2 and CO 2-rich gas mixtures

Abstract

The hydrate formation conditions of CO 2 and CO 2-rich gas mixtures (CO 2>90 mol%) containing N 2/CH 4/C 2H 6 and (N 2+CH 4+C 2H 6) in the presence of aqueous solutions of ethylene glycol were measured in a sapphire cell equipped with magnetic stirrer and data acquisition system. Isothermal pressure-search method was adapted in the pressure range of 0.8–3.5 MPa and a temperature range of 267.2–279.7 K. Eight systems have been studied and a total of 36 data points were measured. In the modeling part, the hydrate models recently developed by this group (Chen–Guo and Zuo–Guo model) and a typical literature reported van der Waals–Platteeuw type model were tested against the hydrate formation data of CO 2-rich gas mixtures in water and aqueous solutions of ethylene/sodium chloride. The performance of various models is evaluated.