Solvents: auto-ignition

Auto-ignition temperature is the temperature at whieh the vapour will ignite without any spark or flame. For some chemicals this can be quite low. Carbon disulfide, an industrial solvent, auto-ignites at around the temperature of boiling water. 

Solvent Formula Specific Gravity Boiling Point (°C) Flash Point (°C) Auto- ignition Point (°C) How to Extinguish Fires... 

Where chlorination is made by chlorine injection in the liquid phase, gas phase explosion hazard is related to chlorine evolution in the vapour phase, giving a flammable mixture with the solvent or reaction mixture vapour. Here hazard assessment is achieved by comparing the gas phase composition with the flammable area of the gaseous mixtures. Auto-ignition is also considered because the autoignition temperature of gaseous mixtures containing chlorine is close to the ambient temperature. 

The extrusion aid must easily coat the resin yet be readily removable from the extrudate. It should also not leave a residue which could alter the color of the product. The volatilization temperature of the lubricant should be lower than the sintering temperature of the polymer. The other requirements of lubricants include high purity, low odor, low polar components, high auto-ignition temperature, low surface tension, and low skin irritation. Common lubricants are synthetic isoparaffmic hydrocarbons available in a wide boiling range. Some of the commercial lubricants include Isopar solvents (available from Exxon Corp.), mineral spirits, and VM P Naphtha (available from Shell Corp.). 

Boiling point, 164 Melting point, -20 Flash point, "C 66 Auto-ignition temperature, C Relative density (water-1) 0.9 Relativevapor density (air-1) 3.0 Reiative density at 20 C of saturated mixture vapor/air(air-1) 1.0 Vapor pressure, mm Hg at 20 C 1.3 Solubility in water oe Explosive limits, vol% in air 2 11.5 Reiative molecular mass 87.1 LogPoctanol/water 0.8 Qrossformula C H NO COLORLESS LIQUID WITH CHARACTERISTIC ODOR Vapor mixes readily with air. Nitrous vapors are a product of combustion. Decomposes when heated, giving off toxic and corrosive vapors. Reacts violently with chlorinated solvents and strong oxidants. Attacks many plasties. ... 

Lowest temperature at which a flammable gas or vaporized liquid will ignite in the absence of a spark or flame, as determined by test method ASTM D 2155 not to be confused with flash point or fire point, which is typically lower. Auto-ignition temperature is a critical factor in heat transfer oils and transformer oils, and in solvents used in high temperature applications. The auto-ignition temperature should be viewed in relation to the entire phenomenon of combustion. 

Solvents contacting a hot surface or subjected to temperatures above the auto-ignition temperature will ignite spontaneously without an ignition source provided sufficient oxygen (air) is present. Anyone interested in the auto-ignition temperatures of a solvent should review the solvent s MSDS or contact the solvent manufacturer. 

Solvent Formula specific gravity Boiling point (°C) Flash point (°C) Auto-ignition point (°C) Howto extinguish fires ... 

---