Process comparison of biomass-to-liquid (BtL) routes Fischer–Tropsch synthesis and methanol to gasoline

  • Maria Iglesias Gonzalez
  • Bettina Kraushaar-Czarnetzki
  • Georg Schaub
Review Article

Abstract

Lignocellulosic biomass is currently seen as a renewable alternative to fossil fuels in the transport sector. There are two possible routes to produce liquid hydrocarbon fuels from biomass via synthesis gas: Fischer–Tropsch (FT) synthesis and methanol to gasoline (MtG). This paper evaluates, based on chemistry and chemical engineering aspects, the process design, the economic feasibility and the process potential for both synthesis routes. FT and MtG reactions can be described under the same overall chemical equation. However, the differences between the two syntheses were found in chemical mechanism, catalyst and product distribution. The material and energy balances do not establish a clear preference for any synthesis route, the market application of the product being a key parameter. The calculated overall chemical energy efficiencies to synthetic liquid hydrocarbons (C5–C20) from biomass are 25.8–46.5% for FT and 23.4–44.4% for MtG. The calculated carbon efficiency to synthetic liquid hydrocarbons (C5–C20) ranges between 18.6% and 33.5% for FT and 17.3–32.8% for MtG. The production costs for synthetic liquid hydrocarbon fuels are calculated based on the efficiencies given above. They range between 21€ and 34€ per gigajoule. These values could drop to 18–28€ per gigajoule in the medium term based on optimistic predictions (increase of efficiencies and reduction of capital investment). If the prize difference between crude oil and biomass becomes as high as 20€ per gigajoule, the production of liquid hydrocarbons from biomass will probably become competitive with petroleum-based products.

Keywords

Fischer–Tropsch Methanol to gasoline Biomass Material and energy balance 

Abbreviations

ASF

Anderson–Schulz–Flory

BtL

Biomass to liquids

CtL

Coal to liquids

DME

Dimethylether

FT

Fischer–Tropsch

GtL

Gas to liquids

HHV

High heating value (MJ/kg)

LTFT

Low-temperature Fischer–Tropsch

MtG

Methanol to gasoline

NC

Carbon number

NZ

New Zealand

rp

Chain propagation rate

rt

Change termination rate

yC,frac

Molar fraction of a lump of hydrocarbons in mole C

yi

Molar fraction of component i

Xi

Conversion of component i

α

Chain growth propagation

η

Efficiency

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Maria Iglesias Gonzalez
    • 1
  • Bettina Kraushaar-Czarnetzki
    • 2
  • Georg Schaub
    • 1
  1. 1.Engler-Bunte-Institut, Fuel Chemistry and TechnologyKarlsruhe Institute of Technology (KIT)KarlsruheGermany
  2. 2.Institute of Chemical Process EngineeringKarlsruhe Institute of Technology (KIT)KarlsruheGermany

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