Hydrate Equilibrium Measurements for CH4 and CO2/CH4 Mixture in the Presence of Single 2-Methyl-2-propanol and 1,1-Dichloro-1-fluoroethane

Hydrate phase equilibrium conditions of CO2/CH4 + 2-methyl-2-propanol (tBA) + water system, CH4 + 1,1-dichloro-1-fluoroethane (HCFC-141b) + water system, CO2 + HCFC-141b + water system, and CO2/CH4 + HCFC-141b + water system were measured. The moles fraction of CO2 in the mixture gases were 0.33 and 0.5, respectively. The mole fraction of HCFC-141b and tBA were 0.056. The measured temperature range is from 283.0 to 294.2 K. The phase equilibrium conditions were tested by an isochoric pressure-search method. Results showed that HCFC-141b has a stronger promotion effect on CH4 hydrate formation than on CO2 hydrate. The effect of CO2 content on the phase equilibrium conditions of CO2/CH4 mixture + HCFC-141b + water is weak. tBA also acts as a promoter for CO2/CH4 mixture gas. In the presence of tBA, the phase equilibrium conditions of the system with higher CO2 content moved to higher pressure and lower temperature region compared with the system with lower CO2 content.