# US 5,700,388 A · Azeotropic or azeotrope-like compositions of ammonia and tetrafluoroethane

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- Number: US 5,700,388 A
- Document ID: US5700388A
- Status: Granted
- Kind: A
- Application number: 08/330,453
- Filed: 1994-10-28
- Granted: 1997-12-23
- Earliest claimed: 1992-09-25
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Mark Brandon Shiflett; Akimichi Yokozeki
- Web page: https://patentgrep.com/patent/US5700388A

## CPC

- C09K 5/045: {containing only fluorine as halogen}
- C09K 3/30: for aerosols (aerosol containers B65D83/14)
- C09K 2205/132: containing nitrogen
- C09K 2205/32: The mixture being azeotropic
- Y10S 264/05: Use of one or more blowing agents together
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Constant boiling azeotropic or azeotrope-like compositions of ammonia and 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, difluoromethane, pentafluoroethane or 1,1,1,2,3,3,3-heptafluoropropane are disclosed that are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.

## Claims

### Claim 1

A mixture consisting essentially of an azeotropic or azeotrope-like composition consisting of either (a) 20 to 99 weight percent ammonia and about 1 to 80 weight percent 1,1,1,2-tetrafluoroethane, wherein said composition boils at about 0.degree. C. when the pressure is adjusted to about 62.2 to 70.4 psia; or (b) about 40 to 99 weight percent ammonia and about 1 to 60 weight percent 1,1,2,2-tetrafluoroethane, wherein said composition boils at about 0.degree. C. when the pressure is adjusted to about 58.1 to 61.9 psia.

### Claim 2 (depends on 1)

The mixture of claim 1 consisting essentially of azeotropic compositions consisting of about 37.9 weight percent ammonia and about 62.1 weight percent 1,1,1,2-tetrafluoroethane; or about 90.6 weight percent ammonia and about 9.4 weight percent 1,1,2,2-tetrafluoroethane.

### Claim 3 (depends on 1)

A process of producing refrigeration, which comprises condensing a composition of claim 1 and thereafter evaporating said composition in the vicinity of a body to be cooled.

### Claim 4 (depends on 1)

A process for producing heat which comprises condensing a composition of claim 1 in the vicinity of a body to be heated and thereafter evaporating said composition.