Guanidinium-based ionic liquids in absorption chillers
This invention relates to using a guanidinium-based ionic liquid as an absorbent material in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent is a guanidinium-based ionic liquid. A preferred refrigerant is water. This invention also provides a method for synthesizing N,N,N′,N′,N″,N″-hexamethylguanidinium acetate.
1. An absorption chiller comprising an absorber compartment and a generator compartment, wherein both compartments comprise a mixture of a refrigerant and an absorbent, and the absorbent is a guanidinium-based ionic liquid, wherein the ionic liquid has an acetate anion.
2. The absorption chiller of claim 1 , wherein the refrigerant is water.
3. The absorption chiller of claim 1 , wherein the ionic liquid has a melting point of 400K or less.
4. The absorption chiller of claim 1 , wherein the ionic liquid has a kinematic viscosity lower than 25 centistokes.
5. An absorption chiller comprising an absorber compartment and a generator compartment, wherein both compartments comprise a mixture of a refrigerant and an absorbent, and the absorbent is a guanidinium-based ionic liquid, wherein the ionic liquid has a hexamethylguanidinium cation.
6. The absorption chiller of claim 5 , wherein the ionic liquid is hexamethylguanidinium acetate.
7. An absorption chiller comprising an absorber compartment and a generator compartment, wherein both compartments comprise a mixture of a refrigerant and an absorbent, and the absorbent is a guanidinium-based ionic liquid, wherein the ionic liquid has a hexaethylguanidinium cation.
8. The absorption chiller of claim 7 , wherein the ionic liquid is hexaethylguanidinium acetate.
9. The absorption chiller of claim 5 , wherein the refrigerant is water.
10. The absorption chiller of claim 5 , wherein the ionic liquid has a melting point of 400K or less.
11. The absorption chiller of claim 5 , wherein the ionic liquid has a kinematic viscosity lower than 25 centistokes.
12. The absorption chiller of claim 7 , wherein the refrigerant is water.
13. The absorption chiller of claim 7 , wherein the ionic liquid has a melting point of 400K or less.
14. The absorption chiller of claim 7 , wherein the ionic liquid has a kinematic viscosity lower than 25 centistokes.