Refrigerant composition and process for prepraration thereof

A refrigerant composition for a single stage refrigeration system comprising:

• more than 25 molar percent but less than 30 molar percent of Nitrogen;
• more than 5 molar percent but less than 20 molar percent of Methane;
• more than 30 molar percent but less than 50 molar percent of Propane optionally up to 45 molar percent of Ethane, Ethylene and combinations thereof.

A process for preparing a refrigerant composition for a single stage refrigeration system operation, said process comprising mixing more than 25 molar percent but less than 30 molar percent of Nitrogen;

• at least some but less than 20 molar percent of Methane;
• more than 30 molar percent but less than 70 molar percent of Propane, Argon, Helium, Neon and combinations thereof, and optionally up to 45 molar percent of Ethane, Ethylene and combinations thereof.

A process for preparing a refrigerant composition for a single stage refrigeration system, said process comprising the step of mixing more than 25 molar percent but less than 30 molar percent of Nitrogen;

• more than 5 but less than 20 molar percent of Methane;
• more than 30 molar percent but less than 50 molar percent of Propane, and optionally up to 45 molar percent of Ethane, Ethylene and combinations thereof.

A method of refrigerating a substance, in a single stage, by preparing a refrigerant composition, compressing the said refrigerant, cooling the said compressed composition, throttling the said cooled refrigerant, and passing the same, thereafter, through an evaporator for cooling the substance, characterized in that the said composition is prepared in accordance with any of the preceding claims.