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
the real risk free rate of interest is 3 percent. Inflation is expected to be 3 percent for 2 years. What is nominal rate of interest for the 2 years bond?

The load data given in Table 1 belongs to a power company. Develop the daily load curve for the primary feeder. Also, determine: a. maximum coincident demand of the system b. deman

Embossing is a forming operation used to create indentation in the sheet, such as raised (indented) lettering or strengthening rips, as shown in fig. Some stretching and thinning o

The closed form solutions for ?max and Mmax are given on page 16.1-276 for several axial loads. Figure C-C2.2 summarizes the results for the first benchmark problem and Figure C-C2

Fix a drawing paper on a drawing board with help of drawing pins. Place a magnetic needle on the drawing paper to identify geographical north and south poles. Mark north, sou

find the relation between enthalpy and internal energy?

Controller Requirements  The requirements for the stability and performance of fight control systems are specified in the certi-fication requirements for U.S. civilian aircraft

Suppose you borrow $10,000 at 10% and you are going to make monthly payments of $2,500. How long until you pay off the loan?

Heat conduction problem in hollow cylinder There are a lot of researches for calculating the temperature field in various shapes using different boundary and initial cond