The paper presents the results of calculations of the P-T diagram of "ice phase (liquid phase)-gas phase-hydrate phase" equilibrium for freons R23 and R34a and 90%R23+10%R134a mixture. It is shown the freon R134a forms a stable CS-II hydrate phase in the temperature range of 260-280 K and pressure range of 0.0267-0.21 MPa and freon R23 creates a stable CS-I hydrate phase in the temperature range of 260-280 K and pressure range of 0.238-0.75 MPa. The calculation results are consistent with the known experimental data. It is shown that addition of 10% of R134a to the freon mixture results in the formation of CS-II hydrate phase in the temperature range of 260-280 K and pressure range of 0.0167-0.15 MPa.
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