Ethene
Distillation is the first step in the processing of crude oil and it takes place in a tall steel tower called a fractionation column. The inside of the column is divided at intervals by horizontal trays. The column is kept very hot at the bottom (the column is insulated) but as different hydrocarbons boil at different temperatures, the temperature gradually reduces towards the top, so that each tray is a little cooler than the one below. The crude needs to be heated up before entering the fractionation column and this is done at first in a series of heat exchangers where heat is taken from other process streams which require cooling before being sent to rundown. Heat is also exchanged against condensing streams from the main column. Typically, the crude will be heated up in this way upto a temperature of 200 - 280 0C, before entering a furnace. As the raw crude oil arriving contains quite a bit of water and salt, it is normally sent for salt removing first, in a piece of equipment called a desalter. Upstream the desalter, the crude is mixed with a water stream, typically about 4 - 6% on feed. Intense mixing takes place over a mixing valve and (optionally) as static mixer. The desalter, a large liquid
At a temperature level of 450-500 C, the larger hydrocarbon molecules become unstable and tend to break spontaneously into smaller molecules of all possible sizes and types. · The regenerator takes place at 680-720 0C. However, a decrease in pressure would slow down the rate of the reaction. 7m/s), the catalyst and the gas form a system that behaves like liquid, i. · removing the product will favour the formation of more product thereby increasing the yield of product. Equilibrium is therefore never actually achieved. · Modern FCC includes a power recovery system for driving the air blower. By varying the time, temperature and pressure under which a particular feedstock remains under cracking conditions, the desired degree of cracking (conversion) can be controlled. It operates best at 120 - 150 0C, hence it is conveniently placed somewhere in the middle of the preheat train. Since, no cracking in thereactor is required, the reactor no longer functions as a reactor; it merely serves as a holding vessel for cyclones. full vessel, uses an electric field to separate the crude from the water droplets. If velocity is too high, the powder will just be carried away with the gas. Catalytic Cracking:When heavy oil fractions are passed in gas phase through a bed of powdered catalyst at a suitable velocity (0.
Common topics in this essay:
Distillation Distillation,
Characteristics Catalytic,
Catalytic Cracking,
Chetalier's Principle,
Production Ethene,
Cracking Thermal,
Properties Ethene,
CH3-CH2Cl Ethene,
Production Styrene,
Addition Hydrogen,
ch2=ch2 +,
fractional distillation,
ethene ethylene,
crude oil,
alcl3 ----->,
addition hydrogen,
rate reaction,
gas -100oc fractional,
tetraethyl lead,
catalytic cracking,
--------> 2h2o,
followed liquefaction gas,
followed steam cracking,
liquefaction gas -100oc,
distillation followed steam,
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