# US 11,306,236 B1 · Environmentally friendly refrigerant compositions having low flammability and low GWP

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- Number: US 11,306,236 B1
- Document ID: US11306236B1
- Status: Granted
- Kind: B1
- Application number: 17/529,482
- Filed: 2021-11-18
- Granted: 2022-04-19
- Earliest claimed: 2021-04-21
- Assignees: Fluorotek, L.L.C.
- Applicants: Fluorofusion Specialty Chemicals, Inc.
- Inventors: David L. Couchot; Sankara N. Ramanan
- Web page: https://patentgrep.com/patent/US11306236B1

## CPC

- C09K 5/045: {containing only fluorine as halogen}
- C09K 2205/106: Carbon dioxide
- C09K 2205/126: Unsaturated fluorinated hydrocarbons
- C09K 2205/22: All components of a mixture being fluoro compounds
- C09K 2205/40: Replacement mixtures
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A refrigerant composition includes R-125 (pentafluoroethane), R-134a (1,1,1,2-tetrafluoroethane), R-32 (difluoromethane), R-227ea (1,1,1,2,3,3,3-heptafluoropropane), R-152a (1,1-difluoroethane), CO2 and R-1234ze (1,3,3,3-tetrafluoropropene). In one exemplary embodiment, the refrigerant includes 18.5-20.5 wt % R-125, about 9-11 wt % R-134a, about 20-22 wt % R-32, about 3-5 wt % R-227ea, about 2.5-4.5 wt % R-152a, about 1-3 wt % CO2 and about 39-41 wt % R-1234ze. Formulating with reclaimed material lowers the global warming potential to about 400 to about 750.

## Claims

### Claim 1

A refrigerant composition, comprising:
about 18.5-20.5 wt % pentafluoroethane;
about 9-11 wt % 1,1,1,2-tetrafluoroethane;
about 20-22 wt % difluoromethane;
about 3-5% 1,1,1,2,3,3,3-heptafluoropropane;
about 2.5-4.5 wt % 1,1-difluoroethane;
about 1-3 wt % CO2; and
about 39-41 wt % 1,3,3,3-tetrafluoropropene.

### Claim 2 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition comprises:
about 19.5 wt % pentafluoroethane;
about 10 wt % 1,1,1,2-tetrafluoroethane;
about 21 wt % difluoromethane;
about 4 wt % 1,1,1,2,3,3,3-heptafluoropropane;
about 3.5 wt % 1,1-difluoroethane;
about 2 wt % CO2; and
about 40 wt % 1,3,3,3-tetrafluoropropene.

### Claim 3 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition has a liquid phase pressure of about 167 psia at 70° F.

### Claim 4 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition has a vapor phase pressure of about 117 psia at 70° F.

### Claim 5 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition has a liquid phase enthalpy of about 0.2308 kJ/g at 70° F.

### Claim 6 (depends on 1)

The refrigerant composition of claim 1,
wherein the refrigerant composition has a vapor phase enthalpy of about 0.4160 kJ/g at 70° F.

### Claim 7 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition has a liquid phase entropy of about 6.150×10−4 kJ/gR at 70° F.

### Claim 8 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition has a vapor phase entropy of about 9.723×10−4 kJ/gR at 70° F.

### Claim 9 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition has a global warming potential of about 1000 to about 1200.

### Claim 10 (depends on 1)

The refrigerant composition of claim 1, wherein at least one of the components contains at least partially reclaimed material to yield a global warming potential of about 400-750.

### Claim 11 (depends on 1)

The refrigerant composition of claim 1, wherein the refrigerant composition contains about 10 wt % reclaimed R-404A to yield a global warming potential of about 630.

### Claim 12

A refrigerant composition having low flammability, comprising:
about 18.5-20.5 wt % pentafluoroethane;
about 9-11 wt % 1,1,1,2-tetrafluoroethane;
about 20-22 wt % difluoromethane;
about 3-5% 1,1,1,2,3,3,3-heptafluoropropane;
about 2.5-4.5 wt % 1,1-difluoroethane;
about 1-3 wt % CO2; and
about 39-41 wt % 1,3,3,3-tetrafluoropropene,
wherein the refrigerant composition has a global warming potential of about 1000 to about 1200.

### Claim 13 (depends on 12)

The refrigerant composition of claim 12, wherein the refrigerant composition comprises:
about 19.5 wt % pentafluoroethane;
about 10 wt % 1,1,1,2-tetrafluoroethane;
about 21 wt % difluoromethane;
about 4 wt % 1,1,1,2,3,3,3-heptafluoropropane;
about 3.5 wt % 1,1-difluoroethane;
about 7 wt % CO2; and
about 40 wt % 1,3,3,3-tetrafluoropropene.

### Claim 14 (depends on 12)

The refrigerant composition of claim 12, wherein the refrigerant composition has a liquid phase pressure of about 167 psia at 70° F.

### Claim 15 (depends on 12)

The refrigerant composition of claim 12, wherein the refrigerant wherein the refrigerant composition has a vapor phase pressure of about 117 psia at 70° F.

### Claim 16

A refrigerant composition, comprising:
about 19-21 wt % pentafluoroethane;
about 7-9 wt % 1,1,1,2-tetrafluoroethane;
about 21-23 wt % difluoromethane;
about 3-5 wt % 1,1,1,2,3,3,3-heptafluoropropane; and
about 38-40 wt % 1,3,3,3-tetrafluoropropene.

### Claim 17 (depends on 16)

The refrigerant composition of claim 16, comprising:
about 20 wt % pentafluoroethane;
about 8 wt % 1,1,1,2-tetrafluoroethane;
about 22 wt % difluoromethane;
about 4 wt % 1,1,1,2,3,3,3-heptafluoropropane; and
about 39 wt % 1,3,3,3-tetrafluoropropene.

### Claim 18 (depends on 16)

The refrigerant composition of claim 16, wherein the refrigerant composition has has a liquid phase pressure of about 140 at 70° F.

### Claim 19 (depends on 16)

The refrigerant composition of claim 16, wherein the refrigerant has a global warming potential of about 1000 to about 1200.

### Claim 20 (depends on 16)

The refrigerant composition of claim 16, wherein at least one of the components contains at least partially reclaimed material to yield a global warming potential of about 400 to about 750.