# US 11,897,829 B2 · Method for producing hydraulic medium including difluoroethylene

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- Number: US 11,897,829 B2
- Document ID: US11897829B2
- Status: Granted
- Kind: B2
- Application number: 17/551,879
- Filed: 2021-12-15
- Published: 2022-04-07
- Granted: 2024-02-13
- Earliest claimed: 2019-06-18
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Tomoyuki Gotou
- Web page: https://patentgrep.com/patent/US11897829B2

## CPC

- C07C 17/42: Use of additives, e.g. for stabilisation
- C07C 21/18: containing fluorine
- C07C 19/08: containing fluorine
- C09K 5/04: the change of state being from liquid to vapour or vice versa
- F25B 2400/12: Inflammable refrigerants
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

Provided is a method for producing a working medium containing difluoroethylene, the difluoroethylene not having self-decomposition properties. A method for producing a working medium containing difluoroethylene.

## Claims

### Claim 1

A method for producing a working medium containing difluoroethylene, comprising mixing a first component containing difluoroethylene at a ratio of more than 65 mol % and held in a first container, and a second component without self-decomposition properties held in a second container, by the following step (A), (B), or (C), the working medium containing difluoroethylene at a ratio of 65 mol % or less based on the entire amount,
wherein, in step (A),
the component held in the first container is supplied to the second container under the following condition (A1) or (A2),
wherein, in condition (A1),
the temperature (t1) of the component held in the first container at the time of the supply is t1<15° C., the relationship between the gauge pressure (P2) in the second container and the gauge pressure (p1) of the component held in the first container at the time of the supply is p1>P2 at least from the start of the supply to the end of the mixing, and the temperature (T2) in the second container is maintained in a state of T2<15° C., and
wherein, in condition (A2),
the component held in the first container at the time of the supply is in a gaseous state in which the temperature (t1) thereof is 15° C.≤t1≤180° C. and the gauge pressure (p1) thereof is p1 [MPaG]<1.22-0.0032t1, the relationship between the gauge pressure (P2) in the second container and the gauge pressure (p1) of the component held in the first container is p1>P2 at least from the start of the supply to the end of the mixing, and the temperature (T2) in the second container is maintained in a state of T2≤180° C. and T2<(1.22−p1)/0.0032,
wherein, in step (B),
the component held in the second container is supplied to the first container under the following conditions (B1) and (B2),
wherein, in condition (B1),
the temperature (T1) and gauge pressure (P1) in the first container are maintained in a state of T1<15° C. or in a state of 15° C.≤T1≤180° C. and P1 [MPaG]<1.22−0.0032T1 at least from the start of the supply to the end of the mixing, and
wherein, in condition (B2),
the gauge pressure (p2) of the component held in the second container is p2>P1 at least at the time of the supply, and
wherein, in step (C),
the component held in the first container is supplied to a separately prepared third container under the following condition (C1) or (C2), while maintaining the temperature (T3) and gauge pressure (P3) in the third container in a state of T3<15° C. or in a state of 15° C.≤T3≤180° C. and P3 [MPaG]<1.22−0.0032T3 at least from the start of the following supply to the end of the mixing, and the component held in the second container is supplied so that the gauge pressure (p2) thereof is p2>P3 at least at the time of supply thereof,
wherein, in condition (C1),
the temperature (t1) of the component held in the first container at the time of the supply is t1<15° C., the relationship between the gauge pressure (P3) in the third container and the gauge pressure (p1) of the component held in the first container at the time of the supply is p1>P3 at least from the start of the supply to the end of the mixing, and the temperature (T3) in the third container is maintained in a state of T3<15° C., and
wherein, in condition (C2),
the component held in the first container at the time of the supply is in a gaseous state in which the temperature (t1) thereof is 15° C.≤t1≤180° C. and the gauge pressure (p1) thereof is p1 [MPaG]<1.22-0.0032t1, the relationship between the gauge pressure (P3) in the third container and the gauge pressure (p1) of the component held in the first container is p1>P3 at least from the start of the supply to the end of the mixing, and the temperature (T3) in the third container is maintained in a state of T3≤180° C. and T3<(1.22−p1)/0.0032.

### Claim 2 (depends on 1)

The method for producing a working medium according to claim 1, wherein the difluoroethylene is at least one member selected from the group consisting of 1,1-difluoroethylene (HFO-1132a), cis-1,2-difluoroethylene (HFO-1132(Z)), and trans-1,2-difluoroethylene (HFO-1132(E)).

### Claim 3 (depends on 1)

The method for producing a working medium according to claim 1, wherein the component held in the second container is at least one member selected from the group consisting of saturated hydrofluorocarbons, unsaturated hydrofluorocarbons, unsaturated hydrochlorofluorocarbons, and unsaturated chlorofluorocarbons.

### Claim 4 (depends on 3)

The method for producing a working medium according to claim 3, wherein the component held in the second container contains a component without self-decomposition properties at a ratio of 35 mol % or more.

### Claim 5 (depends on 1)

The method for producing a working medium according to claim 1, wherein the component held in the second container contains 2,3,3,3-tetrafluoropropene and/or difluoromethane.

### Claim 6 (depends on 1)

The method for producing a working medium according to claim 1, wherein the working medium obtained by mixing the component held in the first container and the component held in the second container is a working medium containing difluoroethylene and 2,3,3,3-tetrafluoropropene,
the ratio of the total amount of difluoroethylene and 2,3,3,3-tetrafluoropropene based on the entire amount of the working medium is 65 mol % to 100 mol %, and
the ratio of difluoroethylene based on the total amount of difluoroethylene and 2,3,3,3-tetrafluoropropene is 1 mol % to 65 mol %.

### Claim 7 (depends on 1)

The method for producing a working medium according to claim 1, wherein the working medium obtained by mixing the component held in the first container and the component held in the second container is a working medium containing difluoroethylene and difluoromethane,
the ratio of the total amount of difluoroethylene and difluoromethane based on the entire amount of the working medium is 65 mol % to 100 mol %, and
the ratio of difluoroethylene based on the total amount of difluoroethylene and difluoromethane is 1 mol % to 65 mol %.

### Claim 8 (depends on 1)

The method for producing a working medium according to claim 1, wherein the working medium obtained by mixing the component held in the first container and the component held in the second container is a working medium containing difluoroethylene, 2,3,3,3-tetrafluoropropene, and difluoromethane,
the ratio of the total amount of difluoroethylene, 2,3,3,3-tetrafluoropropene, and difluoromethane based on the entire amount of the working medium is 65 mol % to 100 mol %, and
based on the total amount of difluoroethylene, 2,3,3,3-tetrafluoropropene, and difluoromethane, the ratio of difluoroethylene is 1 mol % to 65 mol %, the ratio of 2,3,3,3-tetrafluoropropene is 98 mol % or less, and the ratio of difluoromethane is 98 mol % or less.

### Claim 9 (depends on 1)

The method for producing a working medium according to claim 1, wherein the component held in the first container comprises difluoroethylene.

### Claim 10 (depends on 8)

The method for producing a working medium according to claim 8, wherein the component held in the second container comprises a mixture of 2,3,3,3-tetrafluoropropene and difluoromethane.

### Claim 11 (depends on 1)

The method for producing a working medium according to claim 1, wherein the component held in the second container comprises trans-1,3,3,3-tetrafluoropropene.

### Claim 12 (depends on 1)

The method for producing a working medium according to claim 1, wherein the component held in the second container comprises a mixture of trans-1,3,3,3-tetrafluoropropene and difluoromethane.

### Claim 13 (depends on 1)

The method for producing a working medium according to claim 1, wherein in step (A), the temperature in the first container and the temperature in the second container are both maintained at less than 15° C., and the component held in the first container is supplied in a liquid state at t1<15° C. to the second container.

### Claim 14 (depends on 1)

The method for producing a working medium according to claim 1, wherein in step (B), the temperature in the first container and the temperature in the second container are both maintained at less than 15° C., and the component held in the second container is supplied in a liquid state at t2<15° C. to the first container.

### Claim 15 (depends on 1)

The method for producing a working medium according to claim 1, wherein in step (C), the temperature in the first container, the temperature in the second container, and the temperature in the third container are all maintained at less than 15° C., and the component held in the first container is supplied in a liquid state at t1<15° C. and the component held in the second container is supplied in a liquid state at t2<15° C. to the third container.