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Hydrate cold storage and refrigeration technology have a good prospect. Dimethyl ether (DME) has the characteristics of low pollution and a good refrigeration effect, which can replace freon as a refrigerant to reduce pollution due to the greenhouse effect and ozone depletion. Tetrahydrofuran (THF), tetrabutylammonium bromide (TBAB), and cyclopentane (CP) are common hydrate growth promotors. To comprehend the effect of additives on the hydrate phase equilibrium, the phase equilibrium conditions for the DME hydrate and with THF (0.095, 0.190 mass fractions), TBAB (0.160 mass fractions), or CP (0.093 mass fractions) were measured. The formation conditions of the DME hydrate are more moderate than that of the CO2 hydrate. Moreover, the addition of CP with a mass fraction of 0.093 has the best promotion effect. The results provide a basis for both cold storage technology and refrigeration technology.

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