Liquids autoignition temperature

Noncombustible liquid autoignition temperature 480°C (896°F). There is no report of any explosion or fire by quinoline. When mixed with powerful oxidizing substances, quinoline may undergo vigorous to violent reactions. 

Ethyl Acetate An ethyl ester of acetic acid, CH3CO2CH2CH3. A colorless, fragrant, flammable liquid (autoignition temperature, 426°C). Toxic by inhalation and skin absorption. Derived by catalytic esterification of acetic acid with ethanol. Used as solvent in... 

Heptane An alkane (saturated aliphatic hydrocarbon) with six carbon atoms, CH3(CH2)4CHj. A volatile, colorless, flammable liquid (autoignition temperature, 222°C). Toxic by inhalation. Obtained by fi actionation of petroleum. Used as a solvent and in organic synthesis. Also called -Heptane. 

PPS fiber has excellent chemical resistance. Only strong oxidising agents cause degradation. As expected from inherent resia properties, PPS fiber is flame-resistant and has an autoignition temperature of 590°C as determined ia tests at the Textile Research Institute. PPS fiber is an excellent electrical iasulator it finds application ia hostile environments such as filter bags for filtration of flue gas from coal-fired furnaces, filter media for gas and liquid filtration, electrolysis membranes, protective clothing, and composites. 

Autoignition Temperature (AIT) The auto ignition temperature of a substanee, whether solid, liquid, or gaseous, is the minimum temperature required to initiate or eause self-sustained eombustion, in air, with no other souree of ignition. 

By far the most important sulfide is CS2, a colourless, volatile, flammable liquid (mp — 111.6°, bp 46.25°, flash point —30°, autoignition temperature 100°, explosion limits in air 1.25 50%). Impure samples have a fetid almost nauseating stench due to organic impurities but the purified liquid has a rather pleasant ethereal smell it is very poisonous and can have disastrous effects on the nervous system and brain. CSt was formerly manufactured by direct reaction of S vapour and coke in He or steel retorts at 750 1000°C but, since the early 1950s, the preferred synthesis has been the catalysed reaction between sulfur and natural gas ... 

The combustion characteristics of liquid fuels are similarly determined by measures of their ability to sustain a flame. Two measures of the combustion characteristics of liquid fuels especially related to safety are flash point and autoignition temperature. The flash point is the maximum temperature at which a liquid fuel can be maintained in an open vessel exposed to air before which it will sustain a flame... 

Flashpoints (the reason for the plurality is explained in paragraph 1.3) have the advantage of being linked to the boiling point, the pressure and the lower explosive limit. This is the reason why flashpoints are such important parameters in the evaluation of the inflammability risk of a liquid or a solid. The measurement of flashpoints implies the existence of an ignition flame for the gaseous mixture. Nevertheless, contact of a suitable substance-air mixture with a hot surface can be sufficient to start the combustion of the mixture. The autoignition temperature is the parameter that determines the possibility that an inflammable material will combust in contact with a hot substance without the presence of a flame. 

This last inflammability parameter presents problems. After stating its definition it will be seen that measuring autoignition temperature proves to be a difficult exercise because its measurement is sensitive to the experimental conditions, even more sensitive than for flashpoints. Worse, this parameter seems to be controlled by kinetic factors far more complex to master than the thermodynamic factors that probably control flashpoints (in fact it is a liquid/vapour equilibrium). So whilst the influence of the nature of the cup metal on a flashpoint has never been demonstrated, this demonstration was easily made with autoignition temperatures. 

However, to focus attention on the potential hazards always associated with the use of flammable and especially highly flammable substances, some 560 gases and liquids with flash points below 25° C and/or autoignition temperature below 225°C have been included in the text, their names prefixed with a dagger. The numerical values of the fire hazard-related properties of flashpoint, autoignition temperature and explosive (flammability) limits in air where known are given in the tabular Appendix 2. Those elements or compounds which ignite on exposure to air are included in the text, but not in the Table. 

Erosion failure of a pipeline released liquids near autoignition temperature. Vapors spread and ignited causing severe damage to the facility 76,000,000 loss... 

These materials are very easily autoxidised and often have a low autoignition temperature. It is reported that many of the less volatile liquid aldehydes will eventually inflame if left exposed to air on an absorbent surface. The mechanism is undoubtedly similar to that giving rise to easy ignition in the air-oxidation of acetaldehyde and propionaldehyde initial formation of a peroxy-acid which catalyses the further oxidation[l]. Autoignition temperatures of lower aldehydes are much reduced by pressure, but appear to depend little on oxygen content. The effect is worst in the presence of free liquid, in which initial oxidation appears to occur, possibly catalysed by iron, followed by ignition of the vapour phase [2], An acetaldehyde/rust mix exploded at room temperature on increasing the air pressure to 7 bar. 

Flammable liquid volume of 2,000 gal (8,000 I) for accumulators and drums for C4 and lighter material or materials above their autoignition temperatures. 

The autoignition temperature of a substance is the lowest temperature at which a solid, liquid, or gas will spontaneously ignite resulting in self-sustained combustion without the need for an external ignition source. A material released from a process above its autoignition temperature will ignite. Autoignition temperatures of some common materials are shown in Table B-2. 

Vessels, heat exchangers (including air cooled exchangers), and other equipment containing flammable or combustible liquids over 600°F (315°C) or their autoignition temperature, whichever is less. 

Carbon disulfide is an extremely flammable liquid, the closed cup flash point being -22°F (-30°C). Its autoignition temperature is 90°C (194°F). Its vapors form explosive mixtures with air, within a wide range of 1.3 to 50.0% by volume in air. Reactions with certain substances can progress to explosive violence. They include finely divided metals, alkali metals, azides, fulminates, and nitrogen dioxide. 

Syltherm XLT is a polydimethylsiloxane intended for liquid-phase systems which operate at low temperatures. Syltherm 800 is a modified dimethylsiloxane polymer intended for liquid-phase systems. The recommended maximum fluid temperature is greater than the autoignition temperature. 

ISOPROPYL ALCOHOL. CAS 67-63isopropyl alcohol is a colorless liquid at room temperature. Pleasant odor, bp 82.4 C. specific gravity 0.786 20/20 Cl. autoignition temperature. 400 C. The compound is soluble in water, clhy I alcohol, and ether... 

Diketene is a flammable liquid with a flash point of 33°C and an autoignition temperature of 275°C. It decomposes rapidly above 98°C with slow decomposition occurring even at RT. The vapors are denser than air (relative density 2.9, air air = 1). The explosive limits in air are 2—11.7 vol % (135). In case of fire, water mist, light and stabilized foam, as well as powder of the potassium or ammonium sulfate-type should be used. Do not use basic extinguisher powders and do not add water to a closed container. 

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