Methane, Ethane, Propane, Butane, Pentane and Hexane

If someone asked which one has very low Autoignition temperature from above list then it will difficult to predict as we can’t remember each one of its #AIT but here is the trick in case of #hydrocarbons

1.The higher the carbon to hydrogen ratio the lower the Auto ignition temperature and vice versa. So according to that #hexane has very low AIT – 230℃.

2.With an increase in pressure the autoignition temperature decreases. This is particularly important from a #safety point of view when hydrocarbons are compressed.

3.The autoignition temperature is also higher for branched-chain hydrocarbons than for straight-chain hydrocarbons.

We can’t predict the value but this will help in #troubleshooting and #processdesign