petroleum the refining process. petroleum composition petroleum is a complex mixture of hydrocarbons...
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Petroleum
The Refining Process
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Petroleum Composition
• Petroleum is a complex mixture of hydrocarbons
• Mostly saturated or aromatic (~10%)• Small amounts of S (up to 10%), O (up to
5%), N (up to 1%), can have trace amounts of V, Fe, Al, Ca, Cu, Ni, Na, U
• Molecules range greatly in size and are separated into fractions based on boiling point
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Petroleum
The Refining Process
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The Refining Process
• Distilling column separates crude into fractions based on b.p.
• A column can separate ~25,000 barrels/day
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Distillation Fractions
• The demand for different fractions varies with the time of year.
• Gasoline is consumed in large amounts during summer.
• Fuel oil is consumed for heating in winter• Demands also vary with regional climates• Refineries are able to alter the ratios of the
fractions produced to meet demand & maximize profit
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Oil Processing
The distilled fractions can be altered in chemical reactors to produce increased amounts of high demand fuels.
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Chemical Alteration Processes
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Catalytic Reforming
• Produces high octane gasoline• feedstocks are heated to 500oC & passed through a
series of reactors containing Pt/Al2O3 catalyst
• Products are aromatic hydrocarbons
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Alkylation• Produces high octane gasoline
• Requires an acid catalyst (usually H2SO4 or HF)
• Products have high degree of branching• octane rating:
aromatic>branched chain>straight chain
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Fluidized Catalytic Cracking• Breaks large molecules into smaller ones• Requires a large amount of heat input• Reaction quickly fouls the catalyst (SiO2/Al2O3)
with a coke covering on the catalytic surface• Coke burned off exothermically in a regenerator • Regeneration provides heat for cracking process
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Hydroprocessing• Two steps: hydrotreating & hydrocracking• Hydrotreating (hydrogenation)- increases saturation
without breaking molecule• Hydrocracking- breaks molecule into smaller
molecules in the presence of a metal catalyst.• Hydrocracking requires more heat and pressure
than hydrotreating
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Formation of Oxygenates
• Gasoline additives intended to reduce CO emissions (Reformulated gas)
• MTBE (methyl tert-butyl ether) is produced in refineries where isobutene is produced via cracking.
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Advantages of Petroleum
• Easily transported liquid
• Petroleum fuels are quite clean– S & metal contaminants remain in refinery
residue
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Disadvantages of Petroleum
• Oil Spills– Fragile coastal ecosystems at risk from oil
tanker and oil rig spills– a significant amount of petroleum enters marine
environment via natural seepage at continental margins
• natural hydrocarbons metabolized by microbes
– Oil removed by microbes, evaporation and photo-oxidation processes
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Disadvantages of Petroleum
• Emissions– Fossil fuel combustion yields CO2 (greenhouse
gas)
– Gasoline releases 33% more CO2 than natural gas (coal 60%>gasoline)
– NO is produced form N2 and O2 in an internal combustion engine (energy for this process obtained from the exothermic combustion of the gasoline)
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Advantages of Natural Gas
• Clean fuel requiring little processing• Easily transported via pipelines
• CO2 emission per unit of energy lower than other fossil fuels
• Unburned molecules released into the atmosphere contribute less to smog formation than gasoline molecules– methane’s single C is reactive than carbons of longer
hydrocarbon chains
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Disadvantages of Natural Gas
• Requires high pressures or low temperatures to compress into a volume suitable for applications such as automotive transport.
• An unburned CH4 molecule is 20x more potent than a CO2 molecule as a greenhouse gas .
• Methane’s unreactivity results in a long atmospheric lifetime.
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Advantages of Coal
• Large resource base
• Relatively cheap to mine and transport by rail
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Disadvantages of Coal
Transportation usage ended when diesel replaced the steam locomotive
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Disadvantages of Coal
• Low C/H ratio results in more CO2
production per energy unit than other fossil fuels
• SO2 & NO emissions from power plants a primary source of acid rain. Amount of SO2 & NO vary with the type of coal.
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A Coal Burning Power Plant
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Disadvantages of Coal
• Coal extraction costly to environment and human health– Health concerns
• Black-lung disease
• mining explosions
– Environmental concerns• Strip-mining
• Acid rain from mine drainage
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Effects of Coal Strip-mining
Decker, Montana (1985)
Strip-mining done with a dragline scraper.
Compare scale with Caterpillar tractor in the pit!
Door of dragline scraper is 7 feet tall.