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
Gas metal arc welding (GMAW) is performed by using direct current reverse polarity as it gives both good cleaning action and fast filler metal deposition rates. A rather high weldi

What is the difference between real money & nominal money?  Moderate cash is relevant to the evaluate of keeping track of. nominal figure is what is published on the expenses. w

Abradable Linings: Abradable Linings are usually made of a composite material which will be abraded away should the tip of a rotating blade touch the material. In flight the ca

Oil tank: The oil tank is usually mounted on the engine; it may be a separate unit or part of an external gearbox called the sump. It has provision to allow the system to be f

Electronics Engineering Assignment# Solve problems using DC electrical principles 1.3 A 220 F capacitor is required to store 11mJ of energy. What voltage needs to appear

RE-HEAT (AFTER BURNING) Re-heat is a system fitted to a gas turbine engine as a means of increasing the total thrust. As much as twice the thrust can be obtained using reheat.

Railway Inspections - fire safety management: Railway premises can be anything from small open air stations to large underground complexes and the fire safety measures that ar

In the Aircraft Performance course, the aircraft was assumed to be in a steady-state (e.g. steady  cruise, climb, turn, glide), with the forces and moments balanced. The subject of

i need 3 areasof application of lunear programming

Why is there an asteroid belt? - Rocky planetismals survived in the asteroid belt between Mars and Jupiter because they did not grow together into a planet. - Jupiter’s gravity, t