Propane ignition temperature

The most important polyhydric alcohols are shown in Figure 1. Each is a white soHd, ranging from the crystalline pentaerythritols to the waxy trimethylol alkyls. The trihydric alcohols are very soluble in water, as is ditrimethylol-propane. Pentaerythritol is moderately soluble and dipentaerythritol and tripen taerythritol are less soluble. Table 1 Hsts the physical properties of these alcohols. Pentaerythritol and trimethyl olpropane have no known toxic or irritating effects (1,2). Finely powdered pentaerythritol, however, may form explosive dust clouds at concentrations above 30 g/m in air. The minimum ignition temperature is 450°C (3). 

The substitution of one hydroxyl radical for a hydrogen atom in propane produces propyl alcohol, or propanol, which has several uses. Its molecular formula is C3H7OH. Propyl alcohol has a flash point of 77°F and, like all the alcohols, bums with a pale blue flame. More commonly known is the isomer of propyl alcohol, isopropyl alcohol. Since it is an isomer, it has the same molecular formula as propyl alcohol but a different structural formula. Isopropyl alcohol has a flash point of 53 F. Its ignition temperamre is 850°F, while propyl alcohol s ignition temperature is 700 F, another effect of the different stmcture. Isopropyl alcohol, or 2-propanol (its proper name) is used in the manufacture of many different chemicals, but is best known as rubbing alcohol. 

A.3 Identify all the physical properties and changes in the following statement The camp nurse measured the temperature of the injured camper and ignited a propane burner when the water began to boil some of the water vapor condensed on the cold window. ... 

Highly flammable gas ignition temperature 350°C (662°F) forms explosive mixtures with air, with LEL and UEL values of 3.4% and 27% by volnme of air, respectively. It is, however, less flammable than propane-butane mixtnres, as shown by closed drug and flame extension tests. The flame extension of compositions containing 45% methyl ether is 0-15 cm (20-35 cm for propane-butane mixtnre) (Bohnenn 1982) flre-extingnishing method stop flow of gas use a water spray to keep fire-exposed containers cool. 

A.3 The temperature of the injured camper, the evaporation and condensation of water are physical properties. The ignition of propane is a chemical change. 

Figure 5.41 Surface ignition temperature of methane, ethane, propane and butane as determined by Veser and Schmidt over platinum foil [428].

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