CN-122012023-A - Low GWP (global warming potential) substitution refrigerant capable of substituting R134a, preparation method and application thereof

Abstract

The invention belongs to the technical field of refrigerants, and particularly relates to a low GWP (global warming potential) substitution refrigerant capable of substituting R134a, a preparation method and application thereof. The low GWP substitute refrigerant capable of substituting R134a comprises, by weight, 70-89 parts of 1, 2-tetrafluoroethane, 10-20 parts of ‌, 1-difluoroethane ‌ and 1-10 parts of isobutane. As a low GWP alternative refrigerant for replacing R134a, the invention has the advantages of excellent environmental protection, high refrigeration efficiency and good safety, and can be used for an air conditioning system.

Inventors

• LIU YE
• LIU JINGJING
• ZHANG LI

Assignees

• 湖北瑞能华辉能源管理有限公司
• 西安交通大学

Dates

Publication Date

20260512

Application Date

20260123

Claims (10)

1. 1. A low GWP replacement refrigerant capable of replacing R134a is characterized by comprising, by weight, 70-89 parts of 1, 2-tetrafluoroethane, 10-20 parts of ‌, 1-difluoroethane ‌ and 1-10 parts of isobutane.
2. 2. The low GWP replacement refrigerant for alternative R134a according to claim 1, comprising 70 to 80 parts by weight of 1, 2-tetrafluoroethane, 10 to 15 parts by weight of ‌, 1-difluoroethane ‌,1 to 4 parts by weight of isobutane.
3. 3. The low GWP replacement refrigerant for alternative R134a according to claim 1, comprising the components of, by weight, 70 to 80 parts of 1, 2-tetrafluoroethane, 16 to 20 parts of ‌, 1-difluoroethane ‌,5 to 10 parts of isobutane.
4. 4. The low GWP replacement refrigerant for alternative R134a according to claim 1, comprising 81 to 90 parts by weight of 1, 2-tetrafluoroethane, 10 to 15 parts by weight of ‌, 1-difluoroethane ‌,1 to 4 parts by weight of isobutane.
5. 5. The low GWP replacement refrigerant for alternative R134a according to claim 1, comprising 81 to 90 parts by weight of 1, 2-tetrafluoroethane, 16 to 20 parts by weight of ‌, 1-difluoroethane ‌,5 to 10 parts by weight of isobutane.
6. 6. The low GWP replacement refrigerant for replaceable R134a according to claim 1, comprising 71 parts by weight of 1, 2-tetrafluoroethane, 12 parts by weight of 1, 1-difluoroethane ‌,2 parts by weight of isobutane.
7. 7. The low GWP replacement refrigerant for replaceable R134a according to claim 1, comprising 80 parts by weight of 1, 2-tetrafluoroethane, 15 parts by weight of 1, 1-difluoroethane ‌ parts by weight of isobutane.
8. 8. The low GWP replacement refrigerant for replaceable R134a according to claim 1, comprising 88 parts by weight of 1, 2-tetrafluoroethane, 19 parts by weight of 1, 1-difluoroethane ‌,8 parts by weight of isobutane.
9. 9. A method for preparing the low GWP substitution refrigerant capable of substituting R134a according to any one of claims 1 to 8, comprising the steps of injecting each component of gas phase or liquid phase into a pressure-resistant container according to the weight portion ratio, uniformly mixing in a liquid phase state by adopting a physical mixing method, and standing.
10. 10. Use of a low GWP alternative refrigerant to replace R134a according to any of claims 1 to 8, characterized in that: the air cooling system is used for replacing R134a refrigerant in an air cooling system; Or used for replacing R134a refrigerant in a water cooling system; Or used for replacing R134a working medium in the heat pump.

Description

Low GWP (global warming potential) substitution refrigerant capable of substituting R134a, preparation method and application thereof Technical Field The invention belongs to the technical field of refrigerants, and particularly relates to a low GWP (global warming potential) substitution refrigerant capable of substituting R134a, a preparation method and application thereof. Background The R134a refrigerant is an HFC refrigerant widely used in air conditioning and heat pump systems, and its component is tetrafluoroethane. Although R134a has excellent refrigerating performance, its GWP value is high (about 1430). In addition, R32 alone has low GWP (about 675), but has light flammability (A2L safety level) and high exhaust gas temperature, R152a alone has high flammability (A2 safety level) and poor refrigerating efficiency, and R1216 (hexafluoropropylene) alone has very low GWP (< 1), but has large difference in thermophysical properties from R134a and poor system compatibility. The existing substitutes such as R290, R1234yf, R410A and the like have the problems of flammability, increase in GWP, obvious reduction of refrigerating performance and the like although the existing substitutes are improved in GWP or safety. Accordingly, the development of an alternative refrigerant that is low GWP, high performance, safe, and compatible with the R134a system is an urgent need in the air conditioning industry. The invention aims to provide a novel mixed refrigerant, the GWP value of which is significantly lower than that of R134a, and meanwhile, similar thermodynamic performance and operation characteristics are maintained, and the mixed refrigerant is specially optimized for a refrigeration system. Disclosure of Invention In order to solve the defects of the prior art, the invention provides a low GWP (global warming potential) substitution refrigerant capable of substituting R134a, and a preparation method and application thereof. The refrigerant has the advantages of excellent environmental protection, high refrigeration efficiency and good safety, and can be used for an air conditioning system. The technical scheme provided by the invention is as follows: A low GWP replacement refrigerant mixture for replacing R134a comprises, by weight, 70-89 parts of 1, 2-tetrafluoroethane (R134 a, CH 2FCF3), 10-20 parts of ‌, 1-difluoroethane ‌ ‌ (R152 a, CH 3CHF2), 1-10 parts of isobutane (R600 a, C 4H10). Based on the technical scheme: compared with the prior HFC-134a refrigerant, the refrigerant provided by the invention has the advantages that the global warming potential is greatly reduced by about 24% -35%, and the refrigerating capacity per unit volume is equivalent or slightly better than COP; compared with ‌, 1-difluoroethane which is singly used, the refrigerant provided by the invention has the advantages of higher safety (the combustibility is inhibited by adding R134 a); compared with the single use of 1, 2-tetrafluoroethane, the refrigerant provided by the invention has the advantages of lower working pressure, higher refrigerating performance, better system compatibility and no need of large-scale reconstruction of the existing R134a system. Compared with independent use of isobutane, the refrigerant provided by the invention has the advantage of higher safety. Preferably, the low GWP replacement refrigerant for R134a comprises, by weight, 70-80 parts 1, 2-tetrafluoroethane, 10-15 parts ‌, 1-difluoroethane ‌,1-4 parts isobutane. Preferably, the low GWP replacement refrigerant for R134a comprises, by weight, 70-80 parts 1, 2-tetrafluoroethane, 16-20 parts ‌, 1-difluoroethane ‌,5-10 parts isobutane. Preferably, the low GWP replacement refrigerant for R134a comprises 81-90 parts by weight of 1, 2-tetrafluoroethane, 10-15 parts by weight of ‌, 1-difluoroethane ‌,1-4 parts by weight of isobutane. Preferably, the low GWP replacement refrigerant for R134a comprises 81-90 parts by weight of 1, 2-tetrafluoroethane, 16-20 parts by weight of ‌, 1-difluoroethane ‌,5-10 parts by weight of isobutane. More preferably, the low GWP replacement refrigerant that can replace R134a includes 71 parts by weight 1, 2-tetrafluoroethane, 12 parts by weight 1, 1-difluoroethane ‌,2 parts by weight isobutane. More preferably, the low GWP replacement refrigerant that can replace R134a includes 80 parts by weight of 1, 2-tetrafluoroethane, 15 parts by weight of 1, 1-difluoroethane ‌ parts by weight of isobutane. More preferably, the low GWP replacement refrigerant that can replace R134a includes 88 parts by weight of 1, 2-tetrafluoroethane, 19 parts by weight of 1, 1-difluoroethane ‌,8 parts by weight of isobutane. The low GWP substitution refrigerant capable of substituting R134a is any combination of the following various parts: the parts of 1, 2-tetrafluoroethane are 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89; The parts ‌ of the 1, 1-difluoroethane are 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20; th