BASIC REFINING OPERATIONS JED dtd 221210.ppt
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Transcript of BASIC REFINING OPERATIONS JED dtd 221210.ppt
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Presented by
Soma ChattopadhyaySenior Manager (TS)
Haldia Refinery, IOCL 22nd December, 2010
BASIC REFINING OPERATIONS & DISTILLATION
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Refineries in India
Digboi
GuwahatiBarauni
Koyali
Haldia RefineryFourth in the chain of 8 operating refineries under Indian Oil, the largest commercial enterprise in the country and one of the Fortune 500 company in India
Mathura
Panipat
NRLBRPL
HPC-V
CPCL
CBRKRL
MRPL
HPC-MBPC
RPL
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Haldia Refinery
PORT
HALDIA TOWNSHIP
FROM CALCUTTAFROM CALCUTTA
NATIONAL HIGHWAY 41
Geonkhali Roychak
R A I L L
I N K
HFC
SHAW WALLACE
H L L
HALDIA PETRO.
Kukrahati
DURGACHAK
CHLORIDE
LOCATION PLAN
Mitsubishi
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Haldia Refinery
7.5 MMTPA Crude capacity*
Fuel + Lube combine refinery
500 Acres area
7.5 MMTPA Crude capacity*
Fuel + Lube combine refinery
500 Acres area
~1600 employees
Own township and
hospital at 8Km distance
~1600 employees
Own township and
hospital at 8Km distance
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Haldia Refinery: Process Units
FOB BLOCK• CDU-I• CDU-II
• NHDT/CRU•KHDS
LOB BLOCK• VDU-I• PDA• FEU• NMP• SDU• LHFU• CDWU• WHFU
DHDS BLOCK• DHDS• HGU• SRU/ARU/SWS• FCCU• MSQ• NGU
OHCU BLOCK• OHCU• HGU• NGU• SRU/ARU/SWS
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Very SimplifiedPetroleum andPetrochemical
Flowchart
OilWell
CrudeOil
Separations
Con
vers
ions
Sepa
ratio
nsan
dPu
rific
atio
ns
NaturalGas
Propane &Butane
Naphtha(C5 - C10 )
Fuel
Fuel
Gasoline
Jet Fuel
Fuel
RX Ethylene PolyethyleneRX
RX Polymers (Furnitures7 UP Bottles)
RX
RX Organic ChemicalsMore Polymers
(Aspirin, Hair Spray)(Football Helmet, AstroTurf, Nylon)
Home HeatingOil, LubricatingOil, Wax
Diesel Fuels
Kerosene &
Gas Oils (C 10 +)
Coke(Carbon Material Similar to Coal)
Steel Making
AsphaltRoads Pot Holes
Purifications remove sulfur and heavy metals
RX = Chemical Reactions
Graphite Fibers(Tennis Racquets)
THE REFINERY
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What Is Crude Oil?
•Crude Oil is a liquid mixture of thousands of organic chemicals found underground. It is the result of organic matter decaying over thousands of years; hence the name fossil fuel
•Crude oil is found all over the world and varies in its density, aromatics, sulfur, and metals content
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What Is Crude Oil?
•Crude Oil is a liquid mixture of thousands of organic chemicals found underground. It is the result of organic matter decaying over thousands of years; hence the name fossil fuel
•Crude oil is found all over the world and varies in its density, aromatics, sulfur, and metals content
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CRUDE OIL NA
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CRUDE OIL NATURE & COMPOSITION
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Major Refinery Products
•LPG (Propane/Butane)
•GASOLINE
•JET FUELS
•DIESEL FUELS
•HEATING OILS
•LUBRICATING OILS
•ASPHALTS
•COKE (not the kind you drink )
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Gasoline Specifications
Gasoline must meet many criteria which change with the time of year and geographic location. Some critical specifications are:
•Vapor Pressure
• Density
•Octane No.
• Sulfur Content
•Benzene Content
Gasoline is always a blend of a number of streams in the refinery
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Other Specifications
Other refinery products must meet other specifications such as:
•Cetane number
•Density
•Pour Point
•Flash Point
•Viscosity
•Viscosity Index
•Colour
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So, How You Make Good Stuff Out Of That Gooey Crude ?
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In a Complex Refinery with Separation Process and Secondary Conversion Processes………………..
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Very SimplifiedPetroleum andPetrochemical
Flowchart
OilWell
CrudeOil
Separations
Con
vers
ions
Sepa
ratio
nsan
dPu
rific
atio
ns
NaturalGas
Propane &Butane
Naphtha(C5 - C10 )
Fuel
Fuel
Gasoline
Jet Fuel
Fuel
RX Ethylene PolyethyleneRX
RX Polymers (Furnitures7 UP Bottles)
RX
RX Organic ChemicalsMore Polymers
(Aspirin, Hair Spray)(Football Helmet, AstroTurf, Nylon)
Home HeatingOil, LubricatingOil, Wax
Diesel Fuels
Kerosene &
Gas Oils (C 10 +)
Coke(Carbon Material Similar to Coal)
Steel Making
AsphaltRoads Pot Holes
Purifications remove sulfur and heavy metals
RX = Chemical Reactions
Graphite Fibers(Tennis Racquets)
THE REFINERY
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REFINERY CONFIGURATION
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Complexity of a Refinery
The combination of refining processes and operations employed (complexity ) varies from one refinery to another.
Factors deciding the complexity of a refinery
• Nature/source of crude oils to be processed
• Demand pattern in the markets to be covered
• Product quality - current/future
• Production of feedstocks for downstream units
• Environmental stipulations
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Basic Refining Operations
SEPERATION TECHNIQUES
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Desalting Distillation Extraction Filtration Crystallisation Evaporation Condensation
Basic Refining Operations & Processes
De-Sulphurisation Reforming Cracking Iso-merisation Hydro-cracking Coking
Unit Operations Unit Processes
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Crude Desalting
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•Separate crude into fractions
•Convert low octane components to higher octane components
•Convert the very heavy stuff to heavy oils
•Convert heavy oils to Gasoline,Diesel,Jet fuel & Lubes
•Remove Sulfur/Nitrogen through reaction
•Blend intermediate streams together to meet product specifications
•Blending & Certification
•Product Storage & Dispatch
Fractionation Concept
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Distillation - Concept
Distillation is defined as a process in which a liquid or vapour Distillation is defined as a process in which a liquid or vapour mixture of two or more substances is separated into its component mixture of two or more substances is separated into its component fractions of desired purity, by the application and removal of heat. fractions of desired purity, by the application and removal of heat.
Distillation is based on the fact that the vapour of a boiling mixture Distillation is based on the fact that the vapour of a boiling mixture will be richer in the components that have lower boiling points.will be richer in the components that have lower boiling points.
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Types of Distillation Columns
Distillation ColumnsDistillation Columns
BatchBatch ContinuousContinuous
BinaryBinary Multi-ComponentMulti-Component
Two Product & Multi-Product ColumnsTwo Product & Multi-Product ColumnsTray Columns & Packed ColumnsTray Columns & Packed Columns
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Distillation – Basic Operation
The liquid-vapour mixture (feed) is introduced near the middle of the column to a tray The liquid-vapour mixture (feed) is introduced near the middle of the column to a tray known as the feed tray. known as the feed tray. The feed tray divides the column into a top (enriching or rectification section ) and a The feed tray divides the column into a top (enriching or rectification section ) and a bottom (stripping section). bottom (stripping section). The feed flows down the column and collected at the bottom in the reboiler. Heat is The feed flows down the column and collected at the bottom in the reboiler. Heat is supplied to the reboiler to generate vapour using other hot streams or steam.supplied to the reboiler to generate vapour using other hot streams or steam.
The vapour raised in the reboiler is re-introduced into the unit at the bottom of the The vapour raised in the reboiler is re-introduced into the unit at the bottom of the column. column. The liquid removed from the reboiler is known as the bottoms product or simply, The liquid removed from the reboiler is known as the bottoms product or simply, bottoms.bottoms.
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Distillation – Basic Operation
The vapour moves up the column, and as it exits the top of the unit, it is cooled by a The vapour moves up the column, and as it exits the top of the unit, it is cooled by a condenser. condenser.
The condensed liquid is stored in a holding vessel known as the reflux drum. The condensed liquid is stored in a holding vessel known as the reflux drum.
Some of this liquid is recycled back to the top of the column and this is called the Some of this liquid is recycled back to the top of the column and this is called the reflux.reflux.
The condensed liquid that is removed from the system is known as the distillate or top The condensed liquid that is removed from the system is known as the distillate or top product.product.
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SEPARATIONS -CRUDE/VACUUM FRACTIONATION: MOTHER UNITS
•DISTILLATION COLUMNS
ATMOSPHERIC DISTILLATION
Light (LPG, Naphtha & MS), Middle Distillate ( SKO /ATF & HSD ) components and Heavier portion of the crude is separated by heating up to 370 – 380 oC and fractionation at a pressure of 2.0 – 2.8 Kg/cm2g.
VACUUM DISTILLATION
Heavier Distillate ( Heavy Diesel , VGO ) is separated from Reduced Crude Oil (RCO) by heating up to 410 – 420 oC and fractionation under vacuum ( 20-60 mm Hg abs ) condition
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SEPARATIONS CRUDE/VACUUM FRACTIONATION: MOTHER UNITS
Typical Products from CDU
•Gas/LPG
•Naphtha
•SKO/ATF
•HSD
•RCO
•Vacuum Distillation of RCO produces VGO (or LOBS cuts) and VR
•All products need further treatment/processing.
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SEPARATIONS -CRUDE/VACUUM FRACTIONATION: MOTHER UNITS
Typical Products from VDU
•Vacuum Gas Oil
•DHDS Feed Stream
•FCCU Feed Streams
•LOBS Feed Streams
•Vacuum Residue
All products need further treatment/processing.
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REACTIONS
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REACTIONS
Almost all the reactions in the refinery use special catalysts that increase the rate and selectivity of the reaction. This improves efficiency and reduces unwanted byproducts.
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Reactions to Make Higher Octane
ISOMERIZATION
C-C-C-C-C-C --> C C
nC6 C-C-C-C iC6
REFORMING
C-C-C-C-C-C-C --> C
nC7 C C-CH3
C C toluene
C
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Reactions To Make Higher Octane
ALKYLATION
C C
C=C-C + C-C-C --> C-C-C-C-C
C
propylene isobutane isoheptane (2,2,dmp)
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Conversion : Cracking and rearranging molecules to add value
•Need : To increase the production of distillates by converting residues, for value addition
•Major Conversion Processes
Thermal conversion : Visbreaking, Delayed Coking
Catalytic conversion : FCC, Hydrocracking
•Technological Factors Heavier Hydro-Carbon molecules are cracked under severe
operating conditions of Temp. ( 500 – 510 oC ) and pressure ( 1.4 - 2.2 kg/cm2) to get Lighter Hydro-Carbons like LPG , MS & HSD components. Strict operating conditions are maintained to get on-specs. products
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Reactions To Convert Heavy Oils
HYDROCRACKING
H2 + heavy oil --> gasoline + diesel
290 C 150 C 232 C
use boiling point to describe oils
CAT CRACKING
heavy oil --> gasoline + propylene, butane,
other “light ends”
290 C 150 C
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Reactions To Convert Resid
Resid is the “bottom of the barrel” - the material that is left in the bottom of the crude/vacuum distillation towers
COKING
resid + heat --> coke + heavy oil + Lighter Products
> 482 C solid 290 C
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Reactions To Remove Sulfur
HYDRODESULFURIZATION
2 R-SH + H2 --> 2 R + 2 H2S
Mercaptan hydrocarbon
SULFUR RECOVERY
convert H2S to elemental sulfur:
2 H2S + 2 O2 --> SO2 + S + 2 H2O
2 H2S + SO2 --> 3S + 2 H2O
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THANK YOU