5 replies to this topic

[golfdude72]

Hello,

 

I am an entry level engineer in the refining industry.

 

I am working on project to determine how much naphtha is going to the kerosene product based on looking at different naphtha 98% cutpoints. I have boiling point data but when I created a graph of it and began reviewing this data it seemed to me as the cutpoint temperature increased more naphtha would go to the kerosene which doesnt seem correct. I feel that the opposite should be happening.  I may be reading the graph wrong, as to how to measure the amount in the product.

 

If someone could provide more insight or methods to help me with my project that would be great.

Edited by golfdude72, 14 October 2013 - 01:05 PM.

[PingPong]

I am working on project to determine how much naphtha is going to the kerosene product based on looking at different naphtha 98% cutpoints

There is no such thing as a 98% cutpoint

 

It is not clear for outsiders what you have been doing.

[golfdude72]

Basically I am looking at different temperatures for the naphtha cutpoint and tryting to determine how much naphtha remains in the kerosene cut.

[PingPong]

It is still completely unclear how you determined naphtha in kero.

 

In general: for a given TBP cutpoint the amount of naphtha in kero, and kero in naphtha, depends on fractionation sharpness in the column, which depends on number of trays between naphtha and kero drawoff, and L/V ratio over those trays.

[AzoTik1985]

Why do you do it? What do you want to get in the end?

[Himanshu Sharma]

Hey there !

 

One of the convenient Methods establishing amount of Light key in heavy key and vice-versa is the classical concept of Distillation gap and Overlap.

 

It is the difference  between the 5% ASTM temperature of a heavy fraction  minus the 95% ASTM  temperature of the lighter fraction,a positive difference is called gap while a negative is an overlap.5% and 95% ASTM are used as they are most repeatable and thus reliable numbers instead of IBP and FBP.

 

Typically between Naphtha and kero there lies a gap of greater than 15 deg c.

 

Hope this Helps !

 

Himanshu

Edited by Himanshu Sharma, 19 October 2013 - 03:41 AM.