2. SYNTHETIC FUEL DEFINITONS
Synthetic Feed stocks
Any feedstock NOT produced from conventional
crude petroleum.
Resource can be any burnable
material:
Coal
Biomass
Natural gas
Synthetic Fuels
A generic name given to hydrocarbon fuels produced from
natural gas, coal or biomass
3. A number of synthetic fuel's definitions
include fuels produced from biomass,
industrial and municipal waste. The definition
of synthetic fuel may also consist of oil
sands and oil shale as synthetic fuel's
sources and in addition to liquid fuels also
gaseous fuels are covered.
James G. Speight included liquid and gaseous
fuels as well as clean solid fuels produced by
conversion of coal, oil shale or tar sands, and
various forms of biomass.
4. WHY ARE SYNTHETIC FUELS
NEEDED?
5 Reasons for continued production and
improvement of synthetic fuels
• World has a finite supply of conventional
crude oil.
• India’s demand for crude oil is steadily
increasing
• The world jet fuel market is decreasing
• National Security and energy independence
• Synthetic Fuels help India to reduce
dependency on foreign oil.
6. SYNTHETIC FEEDSTOCK
PROCESSES
Synthetic Feedstock sources include:
Natural Gas to Liquids
Coal Gasification: Producing synthetic natural gas
from Coal
Coal Liquefaction: Conversion of coal to liquid
for use as a synthetic fuel.
7. Alternate crude sources include
Shale Oil: Extracted hydrocarbon known
as Kerogen from shale (large shale formations
Exist in Colorado, Utah, and Wyoming)
Tar Sands: Extraction of very heavy, asphalt
“like” crude oil called Bitumen from grains of
sand, or, in some cases, porous carbonate rocks.
The U.S. has some tar sands mainly in Utah. The
largest deposits are in Canada.
8. PRODUCTION OF SYNTHETIC
FUELS
Synthetic fuels are produced by the
chemical process of CONVERSION.
Conversion methods could be Direct
Conversion into liquid transportation fuels,
or Indirect Conversion, in which the source
substance is converted initially into
syngas which then goes through additional
conversion process to become liquid
fuels. Basic conversion methods include
carbonization & pyrolysis along with
hydrogenation & thermal dissolution.
9.
10. DIRECT CONVERSION
Direct conversion refers to processes in
which coal or biomass feedstocks are
converted directly into intermediate or
final products, without going through the
intermediate step of conversion to syngas
via gasification.
Direct conversion processes can be broadly
broken up into two different methods:
Pyrolysis or Carbonization
Hydrogenation
11. HYDROGENATION PROCESSES
One of the main methods of direct
conversion of coal to liquids is by
hydrogenation process or the Bergius
process. In this process, coal is liquefied
by mixing it with hydrogen gas and heating
the system (hydrogenation). Dry coal is
mixed with heavy oil recycled from the
process.
The reaction can be summarized as follows
2222 HHCHC nnnn
12. PYROLYSIS OR CARBONIZATION
PROCESSES
The carbonization conversion occurs
through pyrolysis or destructive distillation, and it
produces condensable coal tar, oil and water
vapour, non-condensable synthetic gas, and a solid
residue-charcoal. The condensed coal tar and oil
are then further processed by hydrogenation to
remove sulphur and nitrogen species, after which
they are processed into fuels.
The process was invented by Lewis Cass Karrick in
the 1920s. Its a low temperature carbonization
where coal is heated at 680 °F (360 °C) to
1,380 °F (750 °C) in the absence of air.
13. INDIRECT CONVERSION
Indirect conversion broadly refers to a
process in which biomass, coal, or natural gas
is converted to a mixture
of hydrogen and carbon monoxide also known
as syngas either,
through gasification or steam methane
reforming, and that syngas is processed into
a liquid transportation fuel using one of a
number of different conversion techniques
depending on the desired end product
14. 1) FISHER-TROPSCH PROCESS
• Fisher-Tropsch (FT) is an emerging technology for
Converting synthetic crude to synthetic fuels.
Brief History
Developed by Germany during World War II to
make gasoline from coal.
Developed out of necessity from a lack of
available crude oil.
Modernized in South Africa by SASOL
Corporation.
15. • Converts coal, natural gas, and low-value refinery
products into high value, clean burning fuel.
• FT offers important emissions benefits compared to
conventional fuel.
Natural Gas
Coal
Pet Coke
Biomass
Wastes
Synthesis Gas
Production
Oxygen
Plant
Air
O2
FT
Liquid
Synthesis
Product
Recovery
Liquid
Fuels
Transportation
Fuels
Tail
Gas
Power
Generation
H2
Hydrogen
Recovery
Wax
Hydrocracking
Wax
Hydrogen
Separation
Hydrogen
Liquid
Fuels
An
Option
CO
H2
Reference: Review of Responses to RFI on Synthetic Fuel, 31 August 2006 (DESC internal presentation)
16. 2) SYNTHETIC FUEL FROM
BIOMASS
Biomass can be any plant derived organic matter,
available on a renewable basis including:
• Dedicated energy crops and trees
• Agricultural food and feed crops
• Agricultural crop wastes
• Wood wastes and residues
• Aquatic Plants
• Animal wastes
• Municipal wastes and other waste
materials.
17.
18. BIOMASS USAGE
Leading source of renewable energy in U.S.
since 1999 .
Provides fuel, heat, electricity, chemicals
and other products.
Agricultural and forestry residues most
common resource for generating electricity
and process steam.
Increases use of crops for biodiesel and
ethanol .
Source: www.eere.energy.gov/biomass
19. BIOMASS PLATFORMS FOR
PRODUCING FUELS
Source: Office of the Biomass Program-Multiyear Plan 2004 and Beyond, Nov. 2003
Biomass
Feed
Pretreatment
Sugar
platform
Hydrolysis/
Separation
Thermochemical
Platform
Gasification/
Pyrolysis
Sugar
Feedstocks
Syngas/
Pyrolysis
Oils
CONVERSION
Catalytic
Chemical
Biological
Thermal
Biobased Fuels
Ethanol, alcohol blends,
Fischer-Tropsch
Liquids, bio-oils,
Biodiesel, fuel additives
Oxygenates, hydrogen
Biobased Products
Replacements for
existing commodity
chemicals, new
commodity chemicals
with improved
performance and
functionality, building
blocks for secondary
chemicals
Electricity and Heat
For utilities, from
distributed systems using
biomass or as a part
of a grid-connected
biorefinary
Residues
20. SUSTAINABILITY
One concern commonly raised about the
development of synthetic fuels plants is
sustainability. Fundamentally, transitioning from
oil to coal or natural gas for transportation fuels
production is a transition from one inherently
depleteable geologically limited resource to
another. One of the positive defining
characteristics of synthetic fuels production is
the ability to use multiple feedstocks (coal, gas,
or biomass) to produce the same product from
the same plant.
21. This provides a path forwards to a
renewable fuel source and possibly more
sustainable, even if the plant originally
produced fuels solely from coal, making
the infrastructure forwards-compatible
even if the original fossil feedstock runs
out.
