Azeotropic composition containing environment-friendly insulating gas trans-1, 1, 1, 4, 4, 4-hexafluoro-2-butene and application of azeotropic composition

Abstract

The invention discloses an azeotropic composition containing environment-friendly insulating gas trans-1, 1, 1, 4, 4, 4-hexafluoro-2-butene and application of the azeotropic composition, and relates to the field of insulating gas. The azeotropic composition comprises a gas 1 and a gas 2, the gas 1 is trans-1, 1, 1, 4, 4, 4-hexafluoro-2-butene, the gas 2 is perfluorobutane, and the azeotropic composition can be used as an insulating medium to be applied to the field of electrical equipment. The gas azeotropic system formed by the gas 1 and the gas 2 in a specific ratio has a lower liquefaction temperature than a single gas and has a lower liquefaction temperature than gases such as perfluoropentanone, the azeotropic composition can be kept in a gaseous state at normal temperature or cold conditions, the operation cost of power equipment is reduced, the GWP is low, and the gas azeotropic composition is suitable for industrial production. The insulating strength can meet application requirements, and the application field is widened.

Description

Technical Field

[0001] The invention relates to the field of insulating gas, and in particular to an azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene and application thereof. Background Art

[0002] Sulfur hexafluoride is widely used as an insulating and arc-extinguishing medium in gas-insulated power equipment. However, its global warming potential is 25,200 times that of carbon dioxide and has a strong greenhouse effect. It is one of the gases whose emissions are clearly restricted by international conventions such as the Paris Agreement. Therefore, it is urgent to find environmentally friendly sulfur hexafluoride to replace insulating gases in my country's power industry.

[0003] For more than half a century, there has been no breakthrough in the research of new environmentally friendly sulfur hexafluoride alternative gases. At present, the following methods are mainly used to reduce the use of SF6 in medium and high voltage equipment: using traditional gases from nature, such as oxygen and nitrogen, but these gases have poor insulation properties; using SF6 mixed gas, mixing SF6 with N2 and dry air to achieve the purpose of reducing the use of SF6, but this type of mixture does not completely avoid the use of SF6; using new environmentally friendly insulating gases, mainly perfluorocarbons, perfluoronitriles, perfluoroketones, and hydrofluoroolefin compounds, among which new insulating gases such as perfluoropentanone and perfluoroisobutyronitrile have been put into use to varying degrees.

[0004] However, perfluorocarbons, perfluoronitriles, perfluoroketones, and hydrofluoroolefins generally have high liquefaction temperatures. Insulating gases with high liquefaction temperatures cannot remain in a gaseous state at too low a temperature or pressure, which limits their application in cold environments or low-temperature operating environments. In addition, in order to keep the gas in a gaseous state at room temperature, additional insulation and heating equipment is required, which not only increases the complexity and maintenance difficulty of the equipment, but also increases the overall operating cost of the equipment. Therefore, the power industry needs to develop new insulating gases with better comprehensive performance. Summary of the invention

[0005] The present invention provides an azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene and application thereof. Trans-1,1,1,4,4,4-hexafluoro-2-butene and perfluorobutane can form a minimum temperature azeotropic mixture. The mixture has a lower boiling point and a lower GWP than the single gas of its components, and exhibits the characteristics of a single substance as a whole, effectively reduces the liquefaction temperature of the new environmentally friendly insulating gas, and has the ability to replace sulfur hexafluoride.

[0006] In order to solve the above technical problems, one of the purposes of the present invention is to provide an azeotropic composition containing an environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising gas 1 and gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene, and gas 2 is perfluorobutane.

[0007] As a preferred embodiment, 30 vt% of trans-1,1,1,4,4,4-hexafluoro-2-buteneperfluorobutane and 70 vt% of perfluorobutane are included.

[0008] As a preferred embodiment, the azeotropic composition has a liquefaction temperature of -4.3°C and an azeotropic pressure of 0.24 MPa.

[0009] In order to solve the above technical problems, the second purpose of the present invention is to provide an azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene for use as an insulating medium in the field of power equipment.

[0010] In order to solve the above technical problems, the third object of the present invention provides an electric power equipment containing an insulating medium, wherein the insulating medium is an azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene.

[0011] As a preferred solution, the operating temperature of the power equipment is -4°C to 40°C.

[0012] As a preferred solution, the insulating medium is mixed with the background gas and then added into the power equipment.

[0013] As a preferred solution, the background gas is at least one of CO2, N2 and dry air.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the azeotropic composition of the environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene of the present invention, the gas azeotropic system formed by gas 1 and gas 2 in a specific ratio has a lower liquefaction temperature than the single gas therein, and has a lower liquefaction temperature than gases such as perfluoropentanone. When applied to power equipment, it can operate at room temperature or in a cold environment, and the azeotropic composition can be kept in a gaseous state at room temperature or in cold conditions, thereby reducing the operating cost of the equipment and expanding the application field.

[0016] 2. In the azeotropic system of trans-1,1,1,4,4,4-hexafluoro-2-butene of the environmentally friendly insulating gas of the present invention, the gas azeotropic system formed by gas 1 and gas 2 at a specific ratio shows the macroscopic properties of a single substance. When the azeotropic system of the environmentally friendly insulating gas is used in a series of electrical equipment, if the equipment leaks, the overall composition of the filled gas remains unchanged;

[0017] 3. In the azeotropic system of the environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene of the present invention, gas 1 trans-1,1,1,4,4,4-hexafluoro-2-butene is a sulfur-free and nitrogen-free hydrofluoroolefin with a GWP value of 18, an ODP value of 0, high insulation strength and almost non-toxicity; gas 2 perfluorobutane is a fluorinated alkane with a GWP value of 8860. By adjusting the ratio of gas 1 to gas 2, the GWP and liquefaction temperature can be minimized while ensuring the insulation strength of the insulating medium to meet application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : is the gas-liquid equilibrium phase diagram PX of the mixed gas of perfluorobutane and trans-1,1,1,4,4,4-hexafluoro-2-butene of the present invention at a constant temperature of -4.3°C (Note: x1 is the liquid phase line, y1 is the gas phase line, and the x-axis is the volume proportion of perfluorobutane in the mixed gas);

[0019] Figure 2 : is the gas-liquid equilibrium phase diagram TX of the mixed gas of perfluorobutane and trans-1,1,1,4,4,4-hexafluoro-2-butene under constant pressure of 0.24 MPa of the present invention (Note: x1 is the liquid phase line, y1 is the gas phase line, and the x-axis is the volume proportion of perfluorobutane in the mixed gas). DETAILED DESCRIPTION

[0020] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Unless otherwise specified, the raw materials used can be obtained commercially, and the same raw materials are used in parallel experiments.

[0021] Trans-1,1,1,4,4,4-hexafluoro-2-butene, HFO-1336mzz(E), is a sulfur-free and nitrogen-free hydrofluoroolefin with a GWP value of 18 and an ODP value of 0. It has high dielectric strength, which is about 1.8 times that of SF6 and is almost non-toxic. As a new type of environmentally friendly gas that does not consume ozone and has a low GWP value, it can be used to replace SF6 as an insulating and arc-extinguishing gas. Perfluorobutane is a fluorinated alkane with a GWP value of 8860. The dielectric strength of perfluorobutane is about 1.32 times that of SF6. In this application, under a specific composition ratio, trans-1,1,1,4,4,4-hexafluoro-2-butene and perfluorobutane form an azeotropic system, while minimizing the GWP. This mixture has a lower boiling point than the single gas of its components, and the overall mixture exhibits the characteristics of a single substance to the outside, and has the ability to replace sulfur hexafluoride.

[0022] Test Example 1

[0023] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 10 vt% of gas 1 and 90 vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene with a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane with a GWP value of 8860 and a liquefaction temperature of -2°C. The gas phase equilibrium temperature of the mixed gas is -3.7°C, the equilibrium gas pressure is 0.24 MPa, and the GWP value is 7975.

[0024] Test Example 2

[0025] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 20 vt% of gas 1 and 80 vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene with a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane with a GWP value of 8860 and a liquefaction temperature of -2°C. The gas phase equilibrium temperature of the mixed gas is -4.2°C, the equilibrium gas pressure is 0.24 MPa, and the GWP value is 7091.

[0026] Test Example 3

[0027] An azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 30 vt% of gas 1 and 70 vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene with a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane with a GWP value of 8860 and a liquefaction temperature of -2°C. The liquefaction temperature of the mixed gas of the azeotropic composition is -4.3°C, the azeotropic gas pressure is 0.24 MPa, and the GWP value is 6207.

[0028] Test Example 4

[0029] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 40vt% of gas 1 and 60vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene with a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane with a GWP value of 8860 and a liquefaction temperature of -2°C. The gas phase equilibrium temperature of the mixed gas is -4.1°C, the equilibrium gas pressure is 0.23MPa, and the GWP value is 5323.

[0030] Test Example 5

[0031] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 50 vt% of gas 1 and 50 vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene with a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane with a GWP value of 8860 and a liquefaction temperature of -2°C. The gas phase equilibrium temperature of the mixed gas is -3.7°C, the equilibrium gas pressure is 0.24 MPa, and the GWP value is 4439.

[0032] Test Example 6

[0033] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 60vt% of gas 1 and 40vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene, has a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane, has a GWP value of 8860, a liquefaction temperature of -2°C, a gas phase equilibrium temperature of the mixed gas of -3°C, an equilibrium gas pressure of 0.23MPa, and a GWP value of 3554.

[0034] Test Example 7

[0035] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 70 vt% of gas 1 and 30 vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene with a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane with a GWP value of 8860 and a liquefaction temperature of -2°C. The gas phase equilibrium temperature of the mixed gas is -2°C, the equilibrium gas pressure is 0.23 MPa, and the GWP value is 2670.

[0036] Test Example 8

[0037] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 80vt% of gas 1 and 20vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene with a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane with a GWP value of 8860 and a liquefaction temperature of -2°C. The gas phase equilibrium temperature of the mixed gas is -0.5°C, the equilibrium gas pressure is 0.21MPa, and the GWP value is 1786.

[0038] Test Example 9

[0039] A composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, comprising 90 vt% of gas 1 and 10 vt% of gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene, has a GWP value of 18, an ODP value of 0, and a liquefaction temperature of 7.5°C, and gas 2 is perfluorobutane, has a GWP value of 8860, a liquefaction temperature of -2°C, a gas phase equilibrium temperature of the mixed gas of 2°C, an equilibrium gas pressure of 0.19 MPa, and a GWP value of 902.

[0040] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene, characterized in that: The invention comprises gas 1 and gas 2, wherein gas 1 is trans-1,1,1,4,4,4-hexafluoro-2-butene, and gas 2 is perfluorobutane.

2. The azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene as claimed in claim 1, characterized in that: It includes 30 vt% of trans-1,1,1,4,4,4-hexafluoro-2-butene perfluorobutane and 70 vt% of perfluorobutane.

3. The azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene as claimed in claim 1, characterized in that: The azeotropic composition has a liquefaction temperature of -4.3°C and an azeotropic pressure of 0.24 MPa.

4. Use of the azeotropic composition containing the environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene as claimed in any one of claims 1 to 3 as an insulating medium in the field of power equipment.

5. An electrical device containing an insulating medium, characterized in that: The insulating medium is an azeotropic composition containing environmentally friendly insulating gas trans-1,1,1,4,4,4-hexafluoro-2-butene as described in any one of claims 1 to 3.

6. An electric power device containing an insulating medium as claimed in claim 5, characterized in that: The operating temperature of the electric power equipment is -4°C to 40°C.

7. An electric power device containing an insulating medium as claimed in claim 5, characterized in that: The insulating medium is mixed with the background gas and then added to the power equipment.

8. An electric power device containing an insulating medium as claimed in claim 7, characterized in that: The background gas is at least one of CO2, N2 and dry air.

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