Economic analysis of ethanol production from switchgrass using hybrid thermal/biological processing

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The economics of ethanol production from switchgrass using Waterloo fast pyrolysis with a fermentation step is investigated. Standard chemical engineering methods are used to estimate capital investment and operating costs. Order of magnitude method is employed for preliminary approximation of capital investment. The azeotropic ethanol production capacity used in this case study is 189 million liters/year (50 million gallons/year). All cost figures are updated to 1997 US $. Total capital investment is estimated to be $142 million, while the annual operating cost is about $118 million with an ethanol selling price of $0.62/l ($2.35/gal). This compares to $0.58/l ($2.20/gal) for ... continued below

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10 p.

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So, K.S.; Brown, R.C. & Scott, D.S. December 31, 1998.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 21 times . More information about this article can be viewed below.

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  • So, K.S.
  • Brown, R.C. Iowa State Univ., Ames, IA (United States). Center for Coal and the Environment
  • Scott, D.S. Univ. of Waterloo, Ontario (Canada). Dept. of Chemical Engineering

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Description

The economics of ethanol production from switchgrass using Waterloo fast pyrolysis with a fermentation step is investigated. Standard chemical engineering methods are used to estimate capital investment and operating costs. Order of magnitude method is employed for preliminary approximation of capital investment. The azeotropic ethanol production capacity used in this case study is 189 million liters/year (50 million gallons/year). All cost figures are updated to 1997 US $. Total capital investment is estimated to be $142 million, while the annual operating cost is about $118 million with an ethanol selling price of $0.62/l ($2.35/gal). This compares to $0.58/l ($2.20/gal) for ethanol from popular wood as determined in a previous study of the Waterloo fast pyrolysis process. Conservation of energy, especially, in the separation and purification steps, and generation of steam from lignin to meet energy requirements are evaluated in terms of energy saving costs. Additional steam has to be purchased, at $0.30 million/year, in order to meet the heat energy requirement of the process. Sensitivity analyses of feedstock cost and yield of sugar fermentation on the selling price of ethanol show that feedstock cost is positively related to ethanol selling price, while the yield has a negative relationship with selling price.

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10 p.

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OSTI as DE99002443

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  • BioEnergy `98 conference, Madison, WI (United States), 4-9 Oct 1998

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  • Other: DE99002443
  • Report No.: CONF-981015--5
  • Grant Number: FC36-96GO10148
  • Office of Scientific & Technical Information Report Number: 334228
  • Archival Resource Key: ark:/67531/metadc681055

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 15, 2015, 5:06 p.m.

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So, K.S.; Brown, R.C. & Scott, D.S. Economic analysis of ethanol production from switchgrass using hybrid thermal/biological processing, article, December 31, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc681055/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.