R1270 propylene refrigerant is what

propylene

propylene is early adoption of petroleum and chemical raw materials, is also one of the important olefin production of petrochemical products. It is important olefin except ethylene. Propylene temperature colorless gas, with slightly sweet. The molecular weight of 42. 08, liquid density 0. 5139 g/cm3, melting point - 191. 2 ℃, boiling point - 47. 4℃。 It slightly narcotic, at 815 ℃, 101. All decomposition under 325 kpa. Flammable, explosive limits of 2% ~ 11%. Insoluble in water, but soluble in organic solvent, is a species of low toxicity. Propylene is the basic materials of the three major synthetic materials, mainly for the production of polypropylene, acrylonitrile, isopropyl alcohol, acetone and epoxy propane etc.

propylene under ordinary conditions of physical properties is a colorless gas, slightly heavier than air, slightly fragrant smell. Compared with other olefin, at the same temperature, the transfer properties of the acrylic is lower than vinyl, but higher than butene. Liquid, temperature and their boiling point temperature, phase in this authorization together with your completed propylene is heavier than butene or olefins has higher viscosity, surface tension and density. In material per gram, enthalpy and entropy of propylene was much higher than that of butene, and enthalpy is half that of ethylene. Right is a list of the physical properties of propylene

chemical properties of ethylene propylene is homologue, it has a general reaction characteristics of olefin, with halogen, hydrogen halide, hypochlorous acid and sulfuric acid reaction, but as a result of propylene and ethylene molecule structure is different, so the chemical properties also have difference, in ethylene molecule structure, C = C bond is in a symmetrical sp2 - Sp2 hybridization orbit, other C - H the keys are in place. sp2- 1 s hybrid orbitals, and in the molecular structure of propylene, one of these C a key has been sp2 - C - s p 3 hybrid orbitals C key replaced, thus increasing the s orbital characteristics of it, make the adjacent C = C bond stress caused by hybridization orbit, produce the conjugate effect.

1。 Aggregation

propylene and ethylene also can be aggregated into polymer compounds, with alkyl aluminum and three cyanide titanium catalyst, about 50 c in temperature and pressure of 2 mpa cases, using gasoline as solvent, the propylene polymerization, the polypropylene.

2。 Hydrogenation

propylene and other contain a double bond of olefins, per mole in the hydrogenation reaction gives off heat is the same, about 12. 56kJ/mol。 But the propylene hydrogenation reaction without commercial value.

3。 Hydration

propylene in under the action of acid can be indirect hydration, the solid catalyst to exist, can direct hydration isopropyl alcohol with sulfuric acid as a catalyst for hydration, propylene first react with sulfuric acid to produce sulfuric acid ester, acid ester hydrolysis of isopropyl alcohol, reaction equations as follows:

the above two methods are industrial production at present.

4。 Catalytic oxidation

catalytic oxidation of propylene to acrolein:

Sohio method using bismuth molybdate or molybdophosphoric acid salt as catalyst is acrolein production new breakthrough in terms of economy, many company also developed a high selective catalyst for multicomponent system, selectivity to propylene meter can reach 75 ~ 84%. With palladium chloride as a catalyst for propylene oxide by acetone, the yield was 92%, and the reaction equation is as follows:

5. Reaction with halogen

propylene with halogen under different conditions can be two kinds of addition reaction at room temperature or in the gas phase under the action of light or under the condition of catalyst, propylene reaction with halogen

6. React with hydrogen bromide

asymmetry olefin and hydrogen halide addition, although the law according to the asymmetric addition. But in the reaction, if the presence of peroxide, hydrogen bromide and hydrochloric acid, hydrogen iodide is different. 1 - is generated Bromine propane - instead of two Bromine propane reaction equation is as follows:

7. Epoxidation reaction

a new total organic peroxide oxidation method is to use produces oxygen free radicals, under the action of catalyst will transfer part of the oxygen to propylene epoxide, wu was born so that hydrogen peroxide into alcohols or ketones, will lead acid into acid main purpose

propylene polymerization generates polypropylene, and ethylene copolymerization of ethylene propylene rubber, benzene hydrocarbon im into isopropyl benzene, hydrate generating isopropyl alcohol, oxidize to propylene oxide, etc. The main purpose of the propylene

dangerous health hazard: this product is a simple asphyxiant and light anesthetic. Acute poisoning: inhaled propylene can cause loss of consciousness, when the concentration of 15%, need 30 minutes; When 24%, 3 minutes; When 35% ~ 40%, to 20 seconds; More than 40%, only 6 seconds, and vomiting. Chronic effects: long-term exposure can cause dizziness, fatigue, general malaise, thinking. Individuals occur disorder of gastrointestinal function.

environmental hazards: has harm to the environment, the water, soil and air pollution.

combustion hazard: this product is flammable.

inhaled: emergency treatment quickly from the scene to fresh air. Keep respiratory tract unobstructed. Such as difficulty in breathing, give oxygen. If breathing stops, artificial respiration immediately. Go to a doctor. Fire measures

dangerous features: flammable, mixed with air to form explosive mixture. Heat and flame is in danger of burning explosion. And nitrogen dioxide, nitrogen tetroxide and nitrogen oxide compound, such as intense contact with other antioxidant violent reaction. The lower part of the gas is heavier than air, can spread to quite far away, in the fire will fire back to combustion.

hazardous combustion products: carbon monoxide, carbon dioxide.

extinguishing methods: cut off the gas source. If can't cut off the gas source, are not allowed to put out the flame of the leak. Water spray cooling container, possible remove the container from fire to open. Agent: water fog, foam, carbon dioxide, dry powder.