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R 134a is a refrigerant to replace CFC -12 in mobile air conditioning and in residential,

commercial and industrial refrigeration systems. It is also used as a blowing agent in rigid

foam insulation, and an important component of blends such as R 404a , R 407c , etc.

Physical Properties	Molecular weight	102.03
	BP, °C	-26.1
	Ice point °C	-
	Critical temperature , °C	101.1
	Critical pressure ,Mpa	4.07
	Density of saturated liquid25 °C,(g/cm3)	1.207
	Specific heat of liquid 25 °C,[KJ/(Kg• °C)]	1.51
	Solubility(water,25 °C)%	0.15
	ODP	0
	GWP	0.29
	Critical density,g/cm3	0.512
	Vaporization heat under BP,KJ/Kg	215
Quality Index	Purity%≥	99.9
	Moisture,PPm ≤	0.001
	Acidity,PPm ≤	0.00001
	Residue on evaporation ,PPm ≤	0.01
	Appearance	colorless , no cloudy
	Odor	no smell

Q:Why artemisinin and its derivatives in the molecular structure of a peroxide chain, the chemical properties are more stable?: Heated to more than sixty degrees on the decomposition of things how to say that stability ...

Q:From the molecular level, are not all the energy obtained from the redox reaction?: The battery is carrying the oxidant, and the hydrocarbon is the air as an oxidant direct reaction, which is less than the rocket engine than the jet engine than the reasons for the red.

Q:The aromatic hydrocarbon derivative refers to monocyclic or polycyclic: To see what is the derivative of aromatic hydrocarbons, by its own is a single ring or multi-ring decision

Q:What is the difference between crude oil and asphalt?: Asphalt is the residue of crude oil

Q:What is organic matter? Candle is organic?: Organic matter refers to the addition: carbon, carbon monoxide, carbon dioxide, carbonated and carbonate carbon compounds

Q:Compare the difference between London smoke and Los Angeles photochemical smog: Los Angeles photochemical smog nitrogen content and hydrocarbons and derivatives more, mainly close to the car exhaust. Foggy London situation related to coal, soot solid particles and sulfur oxide more. Foggy London is more bleak, and Los Angeles is more toxic.

Q:Rush! Hydrocarbon and hydrocarbon derivatives system information includes chemical formula, common name, Chinese name and so on: The system is too difficult to summarize. Too much.

Q:Why not ah?: A series of compounds in which a hydrogen atom in a hydrocarbon molecule is replaced by another atom or radical is called a derivative of a hydrocarbon

Q:Are the asphalt and peat kinds of vegetables have heavy metal?: Asphalt and its flue gas on the skin and mucous membranes are irritating, phototoxic and carcinogenic effects. China's three major asphalt toxicity: coal tar pitch> shale asphalt> petroleum asphalt, the former two are carcinogenic. Asphalt main skin lesions are: phototoxic dermatitis, skin lesions limited to the face, neck and other exposed parts; black disease, skin lesions are often symmetrical distribution in the exposed parts, was flaky, brown - dark brown - brown black; Acne; verrucous vegetation and heat burns caused by accidents. In addition, there are dizziness, head swelling, headache, chest tightness, fatigue, nausea, loss of appetite and other systemic symptoms and eye, nose, throat irritation symptoms.

Q:The role of aromatic hydrocarbons: Two cases: First, the name of monocyclic aromatic hydrocarbons, usually benzene ring for the mother, alkyl as a substituent. Second, the structure is more complex aromatic hydrocarbons, usually based on the hydrocarbon base, benzene ring as a substituent. Xylene, 2-methyl-3-phenylpentane, diphenylmethane, etc. For the naming of multifunctional compounds, attention is given to the priority order of the functional groups. The priority is preceded by the parent, usually: cations, COOH SO2H, COOR, COCl, CONH2, CN, CHO, CO, OH, SH, NH2, alkynes, alkenes, ethers, X, NO2, etc. [2]

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