Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Auto ignition temperature of Terephthalic Acid
- Thread starter natee
- Start date
See Material Safety Data Sheet (MSDS) on
According to this MSDS, Autoignition Temperature is 678°C, a sublimation point is 402°C and melting point is 427°C(?!). They also state that "High dust concentrations have a potential for combustion or explosion. High-voltage static electricity buildup and discharge must be avoided when significant quantities of dust are present."
Other reference (Chemiekaarten) gives AIT of 496°C and melting point of 384°C. The differences are remarkable.
At the AIT, the terephtalic acid is present as a vapor, not as a dust. Maybe more relevant for you is the required ignition energy?
According to this MSDS, Autoignition Temperature is 678°C, a sublimation point is 402°C and melting point is 427°C(?!). They also state that "High dust concentrations have a potential for combustion or explosion. High-voltage static electricity buildup and discharge must be avoided when significant quantities of dust are present."
Other reference (Chemiekaarten) gives AIT of 496°C and melting point of 384°C. The differences are remarkable.
At the AIT, the terephtalic acid is present as a vapor, not as a dust. Maybe more relevant for you is the required ignition energy?
I think Guidoo is right. It may be the ignition energy is what natee is after.
The Minimum Ignition Energy (MIE) to initiate combustion for dusts is, in general, at levels comparable to combustible gases. Many hydrocarbons have MIEs of about 0.25 mJ. Cornstarch dust has a MIE of 0.3 mJ. This is low when compared to sources of ignition.
Electrostatic discharges have energy levels exceeding the MIEs of flammables and can provide an ignition source. A static discharge initiated by walking across a rug, would be 22 mJ, while an ordinary spark plug has a discharge energy of 25 mJ.
The Minimum Ignition Energy (MIE) to initiate combustion for dusts is, in general, at levels comparable to combustible gases. Many hydrocarbons have MIEs of about 0.25 mJ. Cornstarch dust has a MIE of 0.3 mJ. This is low when compared to sources of ignition.
Electrostatic discharges have energy levels exceeding the MIEs of flammables and can provide an ignition source. A static discharge initiated by walking across a rug, would be 22 mJ, while an ordinary spark plug has a discharge energy of 25 mJ.
- Status
Similar threads
- Locked
- Question
