The flash-point of a liquid can be estimated by determining the temperature at w

Question

The flash-point of a liquid can be estimated by determining the temperature at which the equilibrium concentration of the flammable vapors in the air reach a concentration such that:
the summation of [yi/LFLi] = 1.0
where yi is the vapor phase mole percent of component i and LFLi is the lower flammability limit concentration of component i expressed in mole percent. Estimate the flash-point of a liquid mixture containing 50 mol% n-octane and 50 mol% n-nonane. The LFL values for n-octane and n-nonane are 1.0 and .8% by volume. The flash-point of a liquid can be estimated by determining the temperature at which the equilibrium concentration of the flammable vapors in the air reach a concentration such that:
the summation of [yi/LFLi] = 1.0
where yi is the vapor phase mole percent of component i and LFLi is the lower flammability limit concentration of component i expressed in mole percent. Estimate the flash-point of a liquid mixture containing 50 mol% n-octane and 50 mol% n-nonane. The LFL values for n-octane and n-nonane are 1.0 and .8% by volume.
the summation of [yi/LFLi] = 1.0
where yi is the vapor phase mole percent of component i and LFLi is the lower flammability limit concentration of component i expressed in mole percent. Estimate the flash-point of a liquid mixture containing 50 mol% n-octane and 50 mol% n-nonane. The LFL values for n-octane and n-nonane are 1.0 and .8% by volume.

Explanation / Answer

LFL value for n-octane=1% by volume

LFL value for n-nonane=0.8% by volume.

Liquid mixture x=50 mol% of n-octane

x=50 mol% of n-nonane

x=0.5 mol LFL of n-octane & n-nonane mixture=100/50/1+50/0.8=64.5

According to a correlation for organic compound

Tf= -54.5377+0.58883Tb+0.000Tb2

Where Tf=flash point in degree centigrade

Tb=boiling point in degree centigrade

Unless we have the value of Tb, its not possible to find the flash point of the mixture of n-octane & n-nonane.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.