Fractional distillation in fuel - aircraft maintenance , Other Engineering

Fractional distillation

This process is carried out in a fractionating column, which has a series of trays as shown in the figure. The effect of the superheated steam on the heated crude petroleum is to cause the lighter fractions to rise up the column. When rising, the vapour cools and a certain amount condenses on each tray until the tray is full of liquid to the overflow. Thus, each tray is a little cooler than the one below it, and therefore, lighter and lighter fractions will be present on each tray, as the vapours pass up the column. The temperature is controlled at the bottom of the column by the temperature of the crude oil, and at the top of the column by taking a certain amount of the product as it leaves, condensing it and pumping it back into the top of the column. This is known as the reflux.

A certain amount of material will condense, which has a lower boiling point than the bulk of the liquid on a particular tray. To enable separation of these fractions, the liquid from a selected tray is drawn into a smaller auxiliary column, called a ‘side-stripper'. Here it is treated with steam that causes the lightest fractions to vaporise and pass along with the steam into the main column.

118_Fractional Distillation in Fuel.png

The use of these side-strippers enables kerosene and gas oil to be obtained direct from the plant. Lubricating oil distillate, if such is present, can usually be drawn direct from a tray without the use of a side-stripper, while gasoline leaves the top of the column as a vapour and must be cooled to condense it to liquid gasoline.

 

 

Posted Date: 9/12/2012 2:36:44 AM | Location : United States







Related Discussions:- Fractional distillation in fuel - aircraft maintenance , Assignment Help, Ask Question on Fractional distillation in fuel - aircraft maintenance , Get Answer, Expert's Help, Fractional distillation in fuel - aircraft maintenance Discussions

Write discussion on Fractional distillation in fuel - aircraft maintenance
Your posts are moderated
Related Questions

Electrical ice protection systems: Electrical ice protection systems are used on most turbo-props.  Resistance wire heater elements are embedded in rubber and cemented from the

Flifla sells tomatoes every day in Suk al Marqazi, the downtown fruit and vegetable market. He finds that he can order tomatoes in crates of 25 kg and he is able to stock a maximum

Lifting wing FP was run at the conditions corresponding to AGARD WG07 TEST CASE 11, namely M∞ = 0.84,α= 3.06 deg. The ‘final step' values of the partially-conservative paramete

Q. What are the differences between soldering, brazing and welding? Ans. S.No.  Welding Soldering Brazing

A tubular heat exchanger is being used for heating a liquid food from 30 o C to 70 o C. The temperature of the heating medium decreases from 90 o to 60 o C. a) Is the flow conf

what is the input to a process control system?

Expertsmind.com  brings you unique solution in Electrical Engineering   How does OR gate work? An 'OR' gate is like two or more switches positioned in parallel.

Pitch control unit (pcu) operation: The action of the Governor bob weights, due to the varying RPM of the engine, is to raise or lower an internal piston to cover or open fluid

What Is EFT? EFT is short for Electronic Funds Transfer in finance. An EFT is a method of transferring money from one bank account directly to another account without any paper