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The physical characteristics of refrigerant R1270 propylene

by:Arkool     2021-01-09

propylene is often important in the process of oil processing process and ethylene production of related products. Generally range in the process of ethylene production of propylene can be full recovery and refining, production of catalytic cracking unit in propylene also most recycling, so domestic nearly a decade of catalytic cracking unit combined propylene had great development, the corresponding polypropylene production capacity is also developing rapidly. Propylene is mainly used for making petroleum chemical products, such as polypropylene, propylene oxide, isopropyl ketone, acetone and acrylonitrile, only a small amount is used for preparing alkyl benzene compounds ( Such as isopropyl benzene) And polymer gasoline in order to improve the gasoline octane number.

R1270 is refrigerant, possesses the advantages of large capacity, high COP. Environmental performance, Ozone depletion ozeme depletion potential is 0, the greenhouse effect ozeme depletion potential low) And the basic thermal physical properties is better ( Unit mass refrigerating capacity and unit volume refrigerating capacity is greater than the R22, exhaust temperature lower than that of R22, gasification of latent heat and thermal conductivity were greater than R22) And some basic thermophysical properties ( Saturated vapor pressure) Close to R22. With excellent thermodynamic properties and good cycle performance, R22 is extremely has the potential to substitute pure mass. Under the same conditions, R1270 refrigerating capacity and R22 system basic same, compared with R22 refrigeration system, R1270 can effect comparing to improve 6. Dropped 51% 5%, the filling amount, compression ratio by 27%. On the premise of meet the refrigerating capacity, by optimizing the evaporator, the evaporator pipe diameter from 7 mm to 5 mm, and decreases the number of the u-shaped tube changed many decorate, only change the evaporator R1270 prototype experiment, the results show that R1270 refrigerating capacity and R22 system basic same, R1270 refrigeration system can effect comparing to 3. 31, compared with R22 refrigeration system, can effect comparing 12. 6%, filling volume fell by 55%.

propylene under atmospheric pressure is colorless, slightly heavier than air, a slight fragrance, taste of combustible gas. Propylene is a flammable and explosive compounds, its toxicity is not large, the air concentration of cuhk allows for 10-4000 x 6, explosion limit of 2% ~ 11% in the air ( Volume fraction) , when the volume fraction of propylene is more than 60%, after inhaled anesthesia effect, when the concentration of 110 ml/L, inhaled 2. 5 min after drugged, intuition exception; Concentration increased to 260 ml/L, after 4 min inhalation, human body anaesthetic and vomiting, inhaling too much can cause people and animals. So you must keep good ventilation around the store propylene environment, once the inhalation propylene cause suffocation when can perform artificial respiration. Propylene chronic effects on the human body: long-term exposure to propylene, can cause dizziness, fatigue, general malaise and concentration of thinking; Individuals have the symptoms of gastrointestinal disorders. Liquid propylene touches the body, because the liquid propylene will quickly evaporate, causing the skin frostbite ( After the general gas liquefaction, human exposure to the later, can cause frostbite) 。

propylene gas is heavier than air, both in propylene gas and liquid leakage after heavy on the ground or gathered in low areas. Gas can spread very far and is possible to meet fire, one thousand this happens, the flame will flash to the leak location, the result caused by the storage area and serious accidents, so for feeding and unloading of propylene and sampling operation is extremely serious.

propylene can be used as refrigerant, the scientific name is R - 1270 refrigerants, alias R1270, English name propylene, molecular formula C3H6. R1270 belongs to hydrocarbon refrigerants - — No damage to the ozone layer, and the greenhouse effect also is very small, is today's environmental protection refrigerants, from an environmental point of view, almost all countries around the world for R1270 refrigerant on new refrigeration equipment die erste installation, after-sales maintenance and use are in the process of the sky is the limit. Is mainly used to replace R22, r114 refrigerants used in cryogenic refrigeration equipment; Because R1270 flammable, usually only used in less liquid cryogenic refrigeration equipment, or as a component of low-temperature mixed refrigerant; R1270 compatible with traditional lubricating oil.

liquid propylene can be transported by car, train or ship, with less conditions for long distance transportation pipeline. Usually take road of the propylene tank design must be capable of equivalent temperature propylene vapour pressure, and is about 1. 5MPa( Gage pressure) And to limit the flow of liquid in the tank, at room temperature, the vapor pressure of the propylene may be more high, 15 ℃ to 0. 91MPa( Pressure) 。 In the form of liquid storage containers must be produced according to the location of the storage under high temperature vapor pressure to design, such as in the tropics, design criteria to choose 40 ℃, and attached shade on the tank or cooling device, to ensure safe storage at low temperature. For any pressure of storage tank, both spherical and cylindrical must be equipped with safety protection, this is used to prevent due to excessive filling or possible external fire emergency caused by pressure tank of propylene.

security no small matter, for often use some dangerous flammable gas, we should be more strict check regularly, to be safe to a dangerous situation can not be taken lightly, after all, safety is important!


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