A hydrocarbon refrigerant with a warning smell

Abstract

The invention relates to a hydrocarbon refrigerant with warning smell. The hydrocarbon refrigerant with the warning smell is characterized by comprising low-carbon alkane refrigerant and a modifying agent accounting for 0.1-10ppm of total mass of the low-carbon alkane refrigerant, wherein 100 parts of low-carbon alkane refrigerant consists of, by mass, 63-100 parts of propane and 0-37 parts of iso-butane, and 100 parts of modifying agent is prepared by mixing, by mass, 4-80 parts of thiophene derivative, 19-95 parts of pyridine or methylation pyridine and 0.01-2 parts of antioxidant. The hydrocarbon refrigerant is high in refrigerating efficiency, excellent in environmental conservation, good in thermal stability and storage stability, compatible with pipeline materials and good in safety and is suitable for various refrigerating device including air-conditioners, refrigerators, freezers and the like.

Description

technical field [0001] The invention relates to a refrigerant, especially a hydrocarbon refrigerant with a warning smell. Background technique [0002] At present, the refrigerants used in most home appliances are R22 refrigerant (dichlorodifluoromethane, commonly known as Freon) and R134a (1,1,1,2-tetrafluoroethane). In order to protect the ozone layer and reduce the greenhouse effect, 1987 The "Montreal Protocol", which came into effect in 2010, requires the mandatory phase-out of fluorinated refrigerants, and the complete phase-out of fluorinated refrigerants except for maintenance and special purposes will be achieved in 2030. my country is studying and promoting the application of hydrocarbon refrigerants to replace fluorine refrigerants. Hydrocarbon refrigerants refer to single compounds or multi-component mixtures composed of low-carbon paraffins. The most common hydrocarbon refrigerants are propane, isobutane or their mixtures. Hydrocarbon refrigerants do not damag...

AI Technical Summary

Problems solved by technology

However, the problem is that hydrogen sulfide has low sensitivity (the threshold of perception is 0.0005), and the addition amount is large, ranging from 1% to 30%, which will have a serious impact on the refrigeration effect and efficiency of the refrigerant. Corroded and Leaked Road

If ethanethiol warning agent is added, although ethanethiol has high sensitivity (the sensory threshold is 0.0001), ethanethiol has high toxicity, poor stability, easy decomposition and failure, and poor compatibility with pipelines

The Chinese patent application number CN 200480033507 proposes a "detectable refrigerant composition and its application", using hydrofluorocarbons, fluoroethers, hydrocarbon alcohols, hydrocarbon amines, nitrogen oxides, ammonia and other compounds as tracers , these substances themselves are colorless and odorless or have extremely low olfactory thresholds, requiring special equipment such as chemical / electrical activity array detectors, ultrasonic detectors, etc. for detection, and cannot be directly observed

Therefore, the existing hydrocarbon refrigerants containing warning odors cannot meet the actual use requirements

[0006] On the other hand, studies have also shown that warning agents used for coal gas, natural gas or liquefied petroleum gas such as diethyl sulfide, dimethyl sulfide, formazan Alkyl sulfides such as grade ethyl sulfide, although they are widely used in gas leakage warning due to their high olfactory resolution, are not suitable for hydrocarbon refrigeration due to their poor chemical stability and poor compatibility with pipelines agent leak warning

Although Chinese patent applications CN200480038014.7, CN200680042084.9 or CN200810094429.6 also proposed to use acrylate to replace the alkyl sulfide component from the perspective of reducing the sulfur content in the gas warning agent, the stability of acrylate still does not meet the requirements of hydrocarbons. Refrigerant usage requirements