# US 9,039,922 B2 · Low-temperature and average-temperature refrigeration

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- Number: US 9,039,922 B2
- Document ID: US9039922B2
- Status: Granted
- Kind: B2
- Application number: 13/391,405
- Filed: 2010-08-17
- Published: 2012-06-14
- Granted: 2015-05-26
- Earliest claimed: 2009-09-11
- Assignees: Arkema France
- Applicants: Wissam Rached
- Inventors: Wissam Rached
- Web page: https://patentgrep.com/patent/US9039922B2

## CPC

- C09K 5/045: {containing only fluorine as halogen}
- F25B 45/00: Arrangements for charging or discharging refrigerant
- C09K 2205/126: Unsaturated fluorinated hydrocarbons
- C09K 2205/22: All components of a mixture being fluoro compounds
- C09K 2205/40: Replacement mixtures
- F25B 9/006: {the refrigerant containing more than one component (F25B9/004 takes precedence)}
- F25B 2345/001: Charging refrigerant to a cycle
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

The invention relates to binary compositions of 2,3,3,3-tetrafluoropropene and difluoromethane, as a heat transfer fluid in compression, low-temperature and average temperature refrigeration systems, with exchangers operating in counterflow mode or in split flow mode with counterflow tendency. The invention also relates to a heat transfer method.

## Claims

### Claim 1

A method of replacing R-404A in a compression-type low- and medium-temperature refrigeration system, with exchangers operating in countercurrent mode or in crossed-current mode with countercurrent tendency, the method comprising replacing R-404A or R-407C with a composition comprising a refrigerant, the refrigerant consisting of from 61 to 85 wt. % of 2,3,3,3-tetrafluoropropene and from 15 to 39 wt. % difluoromethane.

### Claim 2 (depends on 1)

The method of replacing R-404A as claimed in claim 1, wherein the refrigerant consists of from 70 to 79 wt. % of 2,3,3,3-tetrafluoropropene and from 21 to 30 wt. % of difluoromethane.

### Claim 3 (depends on 1)

The method of replacing R-404A as claimed in claim 1, wherein the composition further comprises a stabilizer.

### Claim 4 (depends on 3)

The method of replacing R-404A as claimed in claim 3, wherein the stabilizer is selected from the group consisting of nitromethane, ascorbic acid, terephthalic acid, azoles, phenolic compounds, epoxides, phosphites, phosphates, phosphonates, thiols and lactones.

### Claim 5 (depends on 3)

The method of replacing R-404A as claimed in claim 3, wherein stabilizer represents at most 5% by weight relative to the refrigerant.

### Claim 6 (depends on 1)

The method of replacing R-404A as claimed in claim 1, wherein the composition further comprises a lubricant.

### Claim 7 (depends on 6)

The method of replacing R-404A as claimed in claim 6, wherein the lubricant is selected from the group consisting of mineral oil, alkylbenzene, polyalkylene glycol and polyvinyl ether.

### Claim 8 (depends on 1)

The method of replacing R-404A as claimed in claim 1, wherein the low- and medium-temperature refrigeration system has a range from −45° C. to −10° C. at an evaporator.