In this communication, the promoting effects of two additive mixtures (cyclopentane + TBANO(3)) on CH4 hydrate phase equilibrium were experimentally investigated using the isochoric method. The mass fractions of TBANO(3) employed in this paper were 5, 10, 15, and 20. The results showed that cyclopentane is a good promoter in comparison with pure water + CH4 systems, and TBANO(3) has a promoting effect but not like cyclopentane in compassion with pure water + CH4 systems. Additionally, the mixture of cyclopentane + TBANO(3) has an important promoting effect in comparison with pure water and TBANO(3) + water + CH4 systems, but it has a less promoting effect in comparison with cyclopentane + water + CH4 systems. Furthermore, a new thermodynamic model was investigated to predict the equilibrium conditions of hydrate dissociation (pressure and temperature). The hydrate phase was described by the van der Waals-Platteeuw model, and the aqueous phase was predicted with the E-NRTL model. In addition, the NRTL model was used to predict the organic phase, and the gas phase was described with SRK EOS. The results revealed that the experimental hydrate dissociation data's agreement with the proposed model is acceptable and possesses an average of 2.43%. Finally, an analogy was generated with the literature data. This study gives a better comparison of hydrate phase equilibrium combined with CH4 capture.