The hydrate formation conditions of CO2 and CO2-rich gas mixtures (CO2>90 mol%) containing N-2/CH4/C2H6 and (N-2+CH4+C2H6) 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 CO2-rich gas mixtures in water and aqueous solutions of ethylene/sodium chloride. The performance of various models is evaluated.