petroleum refining study
TRANSCRIPT
Petroleum refining Study
• Crude Oil components
• Refinery Flowchart
• What is done in refining
What is Crude Oil?
• Mixture of organic
carbon chain
molecules
• Impurities include
sulfur and nitrogen
compounds
• Some metals and
salts too
Crude oil components
Cycloparaffin hydrocarbons in which all of the available
bonds of the carbon atoms are saturated with hydrogen
are called naphthenes. Typical examples of these are
cyclopentane, cyclohexane, etc.
Aromatic hydrocarbons contain a benzene ring which is unsaturated but very stable and frequently behaves as a saturated compound.
In refining, oil is processed
1.To reduce to a pure component
state, to remove impurities
2. To improve or perfect
3. To make blended products with end
use.
Processes in a Refinery. . .?
• Separation of components by distillation, e.g.:
Atmospheric
Vacuum
Hydrotreating (uses excess hydrogen)
• Breaking apart molecules to make smaller ones, e.g.:
catalytic cracking
hydrocracking
• Joining molecules to make bigger ones, e.g.:
Reforming - alkylation that lengthens the hydrocarbon chain
Reforming - cyclic that generates hydrogen
Fractionation utilizes a mass separation technique
called distillation in which the feedstock is distilled into
various cuts of target boiling ranges or even separated
into individual hydrocarbon compounds.
Distillation is accomplished by imposing a temperature
profile across the tower enabling differences in the
equilibrium compositions of the vapor and liquid phases
to change the compositions throughout the distillation
tower.
The refinery processes include chemical
reactions on the hydrocarbons being
processed. Generally, the reactions are carried
out at elevated temperatures in the 600-
1,000°F range depending on the process, and
in most cases at elevated pressures, from 200
pounds per square inch (psi) to as high as
3,000 psi.
Refinery Process Flow Chart
Dis
tilling
Flasher
Visbreaker
CCU
Alky
Sp
litter
Hydrotreating
Hydrotreating
Isom
Reformer
Gas Plant
Sulfur
Fuel Gas
Gasoline
Jet Fuel
Distillate Fuel
Residual
Fuel Leffler, 1985
Other Refinery Units
• Steam Generation
• Wastewater Treatment
• Hydrogen Generation
• Power Generation (e.g., cogen)
• Air Separation Plant
• Loading/Unloading - Railcar, Trucks, etc.
• Storage (high pressure hydrocarbon, crude oil, intermediates)
Floating-Roof Tanks - 150„ diameter is common
Spherical Tanks - 50„ are common
Horton Spheroid (refrigerated)
Steam-Heated Tanks for “Heavier” Products
• Self-Contained Firewater Supply
• Firewater Pumps
Hazardous Materials handled…
• Sulfur
• Hydrofluoric Acid (HF)
• Sulfuric Acid (H2SO4)
• Ammonia (NH3)
• Sodium Hypochlorite
• Radioactive Materials
• Chlorine
• Amines
• MEK
• Sulfur Dioxide (SO2)
• Heavy Metal Catalysts
• Sour Water
• Caustic (fresh/spent)
• Alcohol
• Asbestos
Physical Hazards
• High Pressure/Temperature Steam
• Oil/Gas-Fired Furnaces
• Acoustic
• High Voltage (4160V, 480V, 13.2 kV)
• Falling Hazards
• Confined Space Hazards
• Cranes/Lifting Hazards
• Hot Work Hazards
• Acid Exposure
• Toxic Vapors
• Radiation
• Flammability Hazards
Common PPE Requirements
• Hardhat
• Hardsoled / Hardtoe Shoes
• Safety Glasses with Side
Protection
• Safety Goggles or Faceshield
• Fire-Resistant Clothing
Process Hazards
• Emergency Flare
• Atmospheric Pressure Relief
• High Temperature (up to 2000oF)
• Low Temperature (e.g., Brittle Fracture)
• High Pressure (up to 3000 psig)
• Low Pressure (e.g., vacuum)