8/13/2019 flash point determination

1/2

8/13/2019 flash point determination

2/2

pressure at flash point can be isolated and

inserted to the Antoine equation to get the

temperature at flash point.

[3]

However to get the activity coefficientmust be first computed.

There are different thermodynamic models

that can be used in finding the activity

coefficients of the components in the

solution. These activity coefficients account

for the non-ideality of the solution. The

Margules equation [4], van Laar equation

[5], and the Wilson equation [5] will be usedin this paper.

Margules equation,

[ ] [4]

Van Laar equation,

( )

[5]

Wilson equation

(

) [6]

();

( )

where is the molar volume in cm3/mol, Ris the universal gas constant, and T is the

temperature in Kelvins. The theoretical

flash points can now be compared to the

experimental data.

Source:

http://www.astm.org/Standards/E502.htm

http://www.astm.org/Standards/E502.htmhttp://www.astm.org/Standards/E502.htmhttp://www.astm.org/Standards/E502.htm