Download presentation

Published byEnrique Setter Modified over 3 years ago

1
**The Use of Fractional Distillation to separate components of Crude Oil**

Refining Crude Oil The Use of Fractional Distillation to separate components of Crude Oil

2
**Fractional Distillation Tower**

Crude oil is fed into a furnace and heated without the presence of air (oxygen). Most of the oil is converted into a vapour and rises up the tower (column). As the vapour rises up the tower it begins to cool. Heavier ‘fractions’ of crude oil condense first in the lower parts of the tower. The lightest fractions condense at the top of the tower. Some fractions (1 to 4 carbons remain as gases) Each fraction is removed from the tower as it condenses. Fraction = a hydrocarbon with a specific number of carbon atoms Each fraction has its own condensation temperature

3
**Names of commonly used hydrocarbon fractions**

4
**A two-step fractionation tower**

Some fractions never vapourize and sink to the bottom of the tower as bitumen. This solid fraction is used to produce Asphalt

5
The bubble caps found inside a fractional distillation tower help separate the crude oil vapour into distinct fractions. Heavy fractions that have reached their condensation temperatures will hit the bubble cap, condense and drip down to the pans below. These fractions are then removed from the tower. Lighter fractions remain as vapour will hit the cap but continue to rise up to the next higher layer of bubble caps.

6
A close-up view of the massive furnaces, fractional distillation towers and pipes found in an oil refinery.

7
Notice that the cracking unit in this diagram takes large fractions such as lubricating and heavy gas oils and breaks them into shorter more useful compounds such as naphtha, gasoline and kerosene. The coker removes pure carbon (used as coal powder) from the residual or bitumen. Cracking – the process in which long hydrocarbons are broken into shorter (and more useful) hydrocarbon fractions such as gasoline (petrol). Cracking is achieved by adding steam, heat, hydrogen gas, catalysts or viscosity reducing compounds. example: C20H42 + H2 → C12H26 + C8H18 Reforming – the process in which short hydrocarbon fractions are combined to form more useful long hydrocarbon fractions. Catalysts are used to complete this process. example: C3H8 + C5H12 → C8H18 +H2

8
A flow chart showing the flow of crude oil from the furnace to the fractional distillation tower to cracking and reforming stations and finally to the many storage tanks that store different hydrocarbon fractions

9
**Oil refinery in Sarnia, Ontario**

Oil refinery in Sarnia, Ontario. Fractional distillation towers and storage tanks are visible.

Similar presentations

Presentation is loading. Please wait....

OK

Keywords: Fractionating column, fractions

Keywords: Fractionating column, fractions

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on home automation system Ppt on sales closing techniques Ppt on preservation of public property auctions Ppt on energy cogeneration plant Interactive ppt on classification Resource based view ppt on mac Ppt on national stock exchange in india Ppt on middle stone age Ppt on time management in classroom Ppt on urban local self government in india