1. Texas City Refinery Tour
November 13, 2007
1

2. Agenda
Basics of Refining
Desulfurization
Hydrocracking
Texas City Refinery Operations
Q&A
Plant Tour
Concluding Remarks
2

3. Jonathan Stuart
Vice President
Regional Refinery Operations
3

4. Crude Oil Characteristics
Crudes are classified and priced by density and sulfur content
Crude density is commonly measured by API gravity
• API gravity provides a relative measure of crude oil density
• The higher the API number, the lighter the crude
− Light crudes are easier to process
− Heavy crudes are more difficult to process
Crude sulfur content is measured as a percentage
• Less than 0.7% sulfur content = sweet
• Greater than 0.7% sulfur content = sour
• High sulfur crudes require additional processing to meet regulatory specs
Acid content is measured by Total Acid Number (TAN)
• Acidic crudes highly corrosive to refinery equipment
• High acid crudes are those with TAN greater than 0.7
4

5. Crude Oil Basics
Crude Quality by Types Estimated Quality of Reserves (2006)
4.0%
SOUR
Cold Lake
Cerro Negro
3.5%
Maya
WCS
3.0%
Sweet
Arab Heavy
M-100 (resid)
SULFUR CONTENT
High Acid
2.5% Arab Medium
20%
(Sweet)
Light/Medium
Dubai
Napo 2%
2.0% Mars
Sour
Arab Light
Iran Heavy
2010 13%
Ameriven-Hamaca
66%
1.5%
Heavy
2000 Urals
1990
Sour
Alaskan North Slope
1.0%
SWEET
1980
0.5% WTI
Brent
Tapis
Cabinda Bonny Light
0.0%
15 20 25 30 35 40 45 50
Source: Oil & Gas Journal, Company Information
HEAVY API GRAVITY LIGHT
Source: Industry reports
NOTE: Red line represents the average crude quality by decade (actual and projected)
Majority of global reserves are sour
Most quoted benchmark prices are light sweet crudes
• WTI (West Texas Intermediate), Western Hemisphere
• Brent (North Sea Crude), Europe
Historical trend shows global crude supply becoming heavier and more sour
5

6. What’s in a Barrel of Crude Oil?
Crude Types Characteristics Yields
2005 U.S.
3%
Production
> 34 API Gravity
30%
Light Sweet Crude < 0.7 % Sulfur
Propane/
(e.g. WTI, Brent, Saharan Refinery
8%
34% Butane
7% Gases
35% Demand
Blend)
33%
Most Expensive
Gasoline
RFG
50% Conventional
3% CARB
24 – 34 API Gravity Premium
21%
Medium Sour Crude > 0.7 % Sulfur
(e.g. Mars, Arab Light, 26%
Arab Medium, Urals) 50% Demand
Distillate
33%
50%
Jet Fuel
Less Expensive
Diesel
Heating Oil
1%
< 24 API Gravity
14%
Heavy
10%
> 0.7 % Sulfur Fuel Oil &
22%
Heavy Sour Crude Other
15% Demand
(e.g. Maya, Cerro Negro, Cold
Lake, Western Canadian Select) Source: EIA Refiner Production
63%
Least Expensive
Refineries upgrade crude oil to higher value products
6

7. Basic Refining Concepts
Intermediates Final Products
< 90°F Propane, Butane • Refinery fuel gas
and lighter • Propane
• NGLs
Straight Run
90–220°F More
• Gasoline (high octane)
Gasoline (low
processing
octane)
Crude oil
More
220–315°F • Gasoline (high octane)
Naphtha
• Jet fuel
Distillation processing
Tower
• Kerosene
(Crude
More
315–450°F • Jet fuel
Unit) Kerosene
• Diesel
processing
• Fuel oil
• Gasoline (high octane)
More
450–650°F Light Gas Oil • Diesel
Furnace processing
• Fuel oil
• Gasoline (high octane)
More
650–800°F Heavy Gas Oil • Diesel
Vacuum processing • Fuel oil
Unit
• Gasoline (high octane)
Residual Fuel More
800+°F • Diesel
Oil/Asphalt • Fuel oil
processing
• Lube stocks
7

8. Hydroskimming/Topping Refinery
Crude
Unit
Propane/
4%
Propane/Butane
Butane
Gasoline
Reformer High Octane Gasoline
Low Octane Gasoline RFG
Distillation Tower
30%
and Naphtha Conventional
CARB
Hydrogen
Premium
Light
Distillate
HS Kerosene/Jet Fuel
Sweet LS Kerosene/Jet Fuel
Distillate
34%
Desulfurizer
Jet Fuel
Crude Diesel
LS Diesel/Heating Oil
HS Diesel/Heating Oil
Heating Oil
Heavy
Gas Oil
Vacuum Fuel Oil &
32%
Unit Other
Heavy Fuel Oil
100% Total Yield
Simple, low upgrading capability refineries run sweet crude
8

9. Crude and Vacuum Towers
Reactor
Heater
Crude Atmospheric Tower Vacuum Tower Reformer
9

10. Medium Conversion: Catalytic
Cracking
Crude
Propane/
Unit
8% Butane
Propane/Butane
Gasoline
RFG
Reformer High Octane Gasoline
Low Octane Gasoline 45% Conventional
and Naphtha
Distillation Tower
CARB
Premium
Hydrogen
Distillate
Light LS Kerosene/Jet Fuel
HS Kerosene/Jet Fuel
Desulfurizer Distillate
27%
Sour Jet Fuel
HS Diesel/Heating Oil LS Diesel/Heating Oil Diesel
Crude Heating Oil
Light Cycle Oil
(LCO)
Alkylation
Alkylate
Unit
Fluid Catalytic
Gas Oil
Vacuum Cracker
Unit FCC Gasoline
(FCC) Heavy
Fuel Oil &
24% Other
Heavy Fuel Oil
104% Total Yield
Moderate upgrading capability refineries tend to run more sour crudes
while achieving increased higher value product yields and volume gain
10

11. High Conversion: Coking/Resid
Destruction
Hydrogen Plant
Crude
Gas
Unit
Propane/
7% Butane
Propane/Butane
Gasoline
RFG
Distillation Tower
58%
Reformer High Octane Gasoline Conventional
Low Octane Gasoline
CARB
and Naphtha
Medium/ Premium
Hydrogen
Heavy Distillate
Distillate 28%
HS Kerosene/Jet Fuel LS Kerosene/Jet Fuel
Sour Desulfurizer Jet Fuel
Diesel
Crude Heating Oil
LS Diesel/Heating Oil
HS Diesel/Heating Oil
Hydrocracker Hydrocrackate Gasoline
Light Gas Oil
Ultra Low Sulfur Jet/Diesel
LCO Alkylation
Alky Gasoline
Unit
Fluid Catalytic
Cracker (FCC)
Medium Gas Oil
Vacuum
FCC Gasoline
Unit
Heavy
Fuel Oil &
15% Other
Delayed
Heavy Fuel Oil Coke
Coker
108% Total Yield
Complex refineries can run heavier and more sour crudes while achieving the
highest light product yields and volume gain 11

12. FCC and Hydrocracker Reactors
Fluidized Catalytic Cracker
Reactor Hydrocracker Reactors
Main Column Regenerator
12

13. Cokers
Delayed Coker
Superstructure holds the drill and drill stem
Fluid Coker - Benicia
while the coke is forming in the drum
13

14. Conversion Economics
U.S. Gulf Coast Refinery Margins
30
25
20
15
US $/ Bbl
10
5
0
(5)
(10)
Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07
Arab Medium Hydroskimming LLS Cracking Maya Coking
Need conversion capacity to capitalize on sour crude discounts
• Hydroskim – Breakeven or moderate margins; High resid yield
− When margins are positive – increase crude runs
− When margins are negative – decrease crude runs
• Cracking – Better margins; Lower resid yield
• Coking – Best margins; Lowest resid yield
− Maximize heavy crudes
14

15. Desulfurization Basics
Objective
Remove sulfur from light products (gasoline or diesel) to meet air quality
requirements for clean burning fuels
Desulfurization Unit
Desulfurized Light Products
HC
H2
High Sulfur HC-S
HC-S
HC-S
Light H2
Elemental
H2
Products Catalyst
Sulfur Plant Sulfur
(HC-S) • Agricultural
HC-S
HC-S H2S S
S S • Pharmaceutical
H2 S
HC-S
S S
2
H
Hydrogen Unit
LEGEND
H2 LEGEND
H2 H2 HC : : Hydrocarbon
HC Hydrocarbon
H2 1000 or less PSI; H2 : : Hydrogen
H2
H2 H2 Hydrogen
700 F or less
S : : Sulfur
S Sulfur
15

16. Hydrocracking Basics
Objective
Value added upgrading of high sulfur distillates to low sulfur gasoline and ultra
low sulfur jet/diesel to meet air quality requirements for clean burning fuels
Hydrocracking Unit Desulfurized Hydrocrackate Gasoline
HC
H2
High Sulfur HC-S
HC-S
HC-S H2
Distillate H2 Desulfurized Ultra Low Sulfur Jet/Diesel
HC
H2
H2
(HC-S) Catalysts H2 Elemental
H2
Sulfur Plant Sulfur
HC-S H2 H2 HC-S
• Agricultural
H2S S
H2 S S • Pharmaceutical
HC-S S
S S
2
H
Hydrogen Unit
LEGEND
H2 LEGEND
H2 H2 HC : : Hydrocarbon
HC Hydrocarbon
1300+ PSI;
H2 H2 : : Hydrogen
H2
H2 H2 Hydrogen
725 to 780 F
S : : Sulfur
S Sulfur
16

17. Michael Harrison
Vice President and General Manager
Texas City Refinery
17

18. Valero Texas City Refinery
Acquired by Valero in 1997 via
purchase of Basis Petroleum from
Solomon, Inc.
Located along Houston’s Deep Water
Ship Channel at the Port of Texas City
Began operations in 1908. Supported
World Wars I and II
Throughput capacity of 245,000
barrels per day of crude and other
feedstocks
Produces gasoline, jet fuel, diesel,
LPG, sulfur and chemical feedstocks
18

19. Valero Texas City Refinery
Staffed by over 500 full-time
employees and 300 continuing
service contractors
Recognized as an “OSHA VPP Star
Site”
Received VPP “Star Among Stars
Status in 2003
Received VPP “Spirit Award” in
2004
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20. Texas City Products and
Feedstock Slate
Typical Product Slate Typical Feedstock Slate
Product BPD % Crude S % / API BPD %
Arab Medium / Kuwait 2.7 / 30.7 106,000 46
Gasoline 94,000 40
Ultra Low Sulfur Diesel 50,000 21 Maya 3.5 / 21.1 90,000 39
Jet Fuel 36,000 15 Green Canyon 2.2 / 30.4 14,000 6
Diesel Intermediates 26,000 11
High Sulfur VGO 5.0 / 12.2 7,000 3
Low Sulfur VGO 15,000 6
Residual Oil 6.3 / 4.2 7,000 3
Propylene 11,000 4
Gasoline Components 6,000 3
Propane 3,000 1
Total 230,000 100
Petroleum Coke 4,000 <1
(tons/day)
Sulfur (tons/day) 800 <1
Total Liquid Products 235,000
20

21. Texas City Capital Investments
Over $900 MM invested in capital improvements and $300 MM for turnaround maintenance at
Texas City since Valero’s acquisition
• Delayed Coker Unit – 45 MBPD Capacity
− Started up in 2003
• Gasoline Desulfurization Unit – 48 MBPD Capacity
− Started up in 2003
• LPG Recovery Unit – 35 MM SCF/D Capacity
− Started up in 2004
• Steam Boilers (3)
− Started up in 2005 and 2006
• Electrical Substation
− Operational in 2006
• Administrative Office and Central Control Center
− Occupied May 2005
• Major plant turnaround just completed ($80 MM Turnaround Maintenance and $70 MM Capital
Improvements).
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22. Appendix
22

23. Texas City Refinery
Flow Diagram
23

24. Major Refining Processes – Crude
Processing
Definition
• Separating crude oil into different hydrocarbon groups
• The most common means is through distillation
Process
• Desalting – Prior to distillation, crude oil is often desalted to remove
corrosive salts as well as metals and other suspended solids.
• Atmospheric Distillation – Used to separate the desalted crude into specific
hydrocarbon groups (straight run gasoline, naphtha, light gas oil, etc.) or
fractions.
• Vacuum Distillation – Heavy crude residue (“bottoms”) from the atmospheric
column is further separated using a lower–pressure distillation process.
Means to lower the boiling points of the fractions and permit separation at
lower temperatures, without decomposition and excessive coke formation.
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25. Major Refining Processes – Cracking
Definition
• “Cracking” or breaking down large, heavy hydrocarbon molecules into
smaller hydrocarbon molecules thru application of heat (thermal) or through
the use of catalysts
Process
• Coking – Thermal non–catalytic cracking process that converts low value oils to
higher value gasoline, gas oils and marketable coke. Residual fuel oil from vacuum
distillation column is typical feedstock.
• Visbreaking – Thermal non–catalytic process used to convert large hydrocarbon
molecules in heavy feedstocks to lighter products such as fuel gas, gasoline, naphtha
and gas oil. Produces sufficient middle distillates to reduce the viscosity of the heavy
feed.
• Catalytic Cracking – A central process in refining where heavy gas oil range feeds are
subjected to heat in the presence of catalyst and large molecules crack into smaller
molecules in the gasoline and surrounding ranges.
• Catalytic Hydrocracking – Like cracking, used to produce blending stocks for gasoline
and other fuels from heavy feedstocks. Introduction of hydrogen in addition to a
catalyst allows the cracking reaction to proceed at lower temperatures than in
catalytic cracking, although pressures are much higher.
25

26. Major Refining Processes –
Combination
Definition
• Linking two or more hydrocarbon molecules together to form a large
molecule (e.g. converting gases to liquids) or rearranging to improve the
quality of the molecule
Process
• Alkylation – Important process to upgrade light olefins to high–value
gasoline components. Used to combine small molecules into large
molecules to produce a higher octane product for blending with gasoline.
• Catalytic Reforming – The process whereby naphthas are changed
chemically to increase their octane numbers. Octane numbers are
measures of whether a gasoline will knock in an engine. The higher the
octane number, the more resistance to pre or self–ignition.
• Polymerization – Process that combines smaller molecules to produce high
octane blending stock.
• Isomerization – Process used to produce compounds with high octane for
blending into the gasoline pool. Also used to produce isobutene, an
important feedstock for alkylation.
26

27. Major Refining Processes – Treating
Definition
• Processing of petroleum products to remove some of the sulfur, nitrogen,
heavy metals, and other impurities
Process
• Catalytic Hydrotreating, Hydroprocessing, sulfur/metals removal – Used to
remove impurities (e.g. sulfur, nitrogen, oxygen and halides) from petroleum
fractions. Hydrotreating further “upgrades” heavy feeds by converting
olefins and diolefins to parafins, which reduces gum formation in fuels.
Hydroprocessing also cracks heavier products to lighter, more saleable
products.
27

28. List of Refining Acronyms
AGO – Atmospheric Gas Oil kVA – Kilovolt Amp
ATB – Atmospheric Tower Bottoms LCO – Light Cycle Oil
B–B – Butane–Butylene Fraction LGO – Light Gas Oil
BBLS – Barrels LPG – Liquefied Petroleum Gas
BPD – Barrels Per Day LSD – Low Sulfur Diesel
BTX – Benzene, Toluene, Xylene LSR – Light Straight Run (Gasoline)
CARB – California Air Resource Board MON – Motor Octane Number
CCR – Continuous Catalytic Regenerator MTBE – Methyl Tertiary–Butyl Ether
DAO – De–Asphalted Oil MW – Megawatt
DCS – Distributed Control Systems NGL – Natural Gas Liquids
DHT – Diesel Hydrotreater NOX – Nitrogen Oxides
DSU – Desulfurization Unit P–P – Propane–Propylene
EPA – Environmental Protection Agency PSI – Pounds per Square Inch
ESP – Electrostatic Precipitator RBOB – Reformulated Blendstock for Oxygen Blending
FCC – Fluid Catalytic Cracker RDS – Resid Desulfurization
GDU – Gasoline Desulfurization Unit RFG – Reformulated Gasoline
GHT – Gasoline Hydrotreater RON – Research Octane Number
GOHT – Gas Oil Hydrotreater RVP – Reid Vapor Pressure
GPM – Gallon Per Minute SMR – Steam Methane Reformer (Hydrogen Plant)
HAGO – Heavy Atmospheric Gas Oil SOX – Sulfur Oxides
HCU – Hydrocracker Unit SRU – Sulfur Recovery Unit
HDS – Hydrodesulfurization TAME – Tertiary Amyl Methyl Ether
HDT – Hydrotreating TAN – Total Acid Number
HGO – Heavy Gas Oil ULSD – Ultra–low Sulfur Diesel
HOC – Heavy Oil Cracker (FCC) VGO – Vacuum Gas Oil
H2 – Hydrogen VOC – Volatile Organic Compound
H2S – Hydrogen Sulfide VPP – Voluntary Protection Program
HF – Hydroflouric (adic) VTB – Vacuum Tower Bottoms
HVGO – Heavy Vacuum Gas Oil WTI – West Texas Intermediate
kV – Kilovolt WWTP – Waste Water Treatment Plant
28

29. Safe Harbor Statement
Statements contained in this presentation that state the
Company's or management's expectations or predictions
of the future are forward–looking statements intended to
be covered by the safe harbor provisions of the Securities
Act of 1933 and the Securities Exchange Act of 1934. The
words quot;believe,quot; quot;expect,quot; quot;should,quot; quot;estimates,quot; and
other similar expressions identify forward–looking
statements. It is important to note that actual results could
differ materially from those projected in such forward–
looking statements. For more information concerning
factors that could cause actual results to differ from those
expressed or forecasted, see Valero’s annual reports on
Form 10-K and quarterly reports on Form 10-Q, filed with
the Securities and Exchange Commission, and available
on Valero’s website at www.valero.com.
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