Process Design and Costing of Bioethanol Technology: A Tool for Determining the Status and Direction of Research and Development
Tóm tắt
Bioethanol is a fuel‐grade ethanol made from trees, grasses, and waste materials. It represents a sustainable substitute for gasoline in today's passenger cars. Modeling and design of processes for making bioethanol are critical tools used in the U.S. Department of Energy's bioethanol research and development program. We use such analysis to guide new directions for research and to help us understand the level at which and the time when bioethanol will achieve commercial success. This paper provides an update on our latest estimates for current and projected costs of bioethanol. These estimates are the result of very sophisticated modeling and costing efforts undertaken in the program over the past few years. Bioethanol could cost anywhere from $1.16 to $1.44 per gallon, depending on the technology and the availability of low cost feedstocks for conversion to ethanol. While this cost range opens the door to fuel blending opportunities, in which ethanol can be used, for example, to improve the octane rating of gasoline, it is not currently competitive with gasoline as a bulk fuel. Research strategies and goals described in this paper have been translated into cost savings for ethanol. Our analysis of these goals shows that the cost of ethanol could drop by 40 cents per gallon over the next ten years by taking advantage of exciting new tools in biotechnology that will improve yield and performance in the conversion process.
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Tài liệu tham khảo
Sheehan J., 1999, Enzymes, Energy and the Environment: Cellulase Development in the Emerging Bioethanol Industry, Biotechnol. Prog., 15
Lynch M.Future Oil Supplies: Is Wolf Really at Door?Forum for Applied Research and Public Policy Spring1992pp23–27.
Annual Energy Outlook 1999 with Projections to 2020. Energy Information Administration. Report No. DOE/EIA‐0383(99). U.S. Department of Energy Washington D. C. 1999.
Wright J.;D'Agincourt C.Evaluation of Sulfuric Acid Hydrolysis Processes for Alcohol Fuel Production.Biotechnol. Bioeng. Symp. No. 14 1984 105–123.
Wright J. D., 1988, Ethanol from Lignocellulose: An Overview, Energy Prog., 8, 71
Technical and Economic Evaluation of Wood to ethanol Process. A report prepared for Solar Energy Research Institute Chem Systems Terrytown NY 1990.
ASPEN Plus Release 9.2–1 Aspen Technology Inc. Cambridge MA October 1995.
Wooley R. J.;Putsche V.Development of an ASPEN PLUS Physical Property Database for Biofuels Components. NREL/MP‐425–20685 April 1996.
Wastewater Treatment Options for the Biomass‐To‐Ethanol Process; NREL Subcontract AXE‐8–18020–01 Final Report Merrick & Company Aurora CO 10/20/98.
Wooley R.;Ruth M.;Sheehan J.;Majdeski H.;Galvez A.Lignocellulosic Biomass to Ethanol Process Design and Economics Utilizing Co – Current Dilute Acid Prehydrolysis and Enzymatic Hydrolysis Current and Futuristic Scenarios; Report No. NREL/TP‐580–2615. National Renewable Energy Laboratory Golden CO July 1999 (http://www.ott.doe.gov/biofuels/process_engineering.html).
ICARUS Process Evaluator Version 4.0 ICARUS Corporation Rockville MD June 30 1997.
Seehttp://www.arkenol.com
Anonymous. Bagasse‐to‐Ethanol Plant Proposed.Ethanol Report. January 8 1998.
Wald M. L.A New Bacterium Helps Turn Agricultural Waste Into Energy to Fuel Cars.The New York Times October 25 1998.
Thomas S., 1995, Enzymatic Degradation of Insoluble Carbohydrates, 208
1998, Bioethanol Strategic Road map : A planning framework for development of biomass‐to‐ethanol technology (Preliminary Draft)
Farmer J.;Hayward T.;Newman M.;Ruth M.;Tucker M.;McMillan J.Milestone Completion Report: Demonstrate process technology meeting or exceeding process qualifier performance in the mini‐pilot biochemical conversion system and assess continuous SSCF performance to recommend future work.Internal Report National Renewable Energy Laboratory Golden Colorado September 1997.
Walsh M., 1997, The Evolution of the Fuel Ethanol Industry: Feedstock Availability and Price. Internal report to the Office of Transportation Technologies
Glassner D.;Hettenhaus J.;Schechinger T.Corn Stover Collection Project. InBioEnergy'98 – Expanding Bioenergy Partnerships: Proceedings; Madison WI 1998; Vol. 2 pp1100–1110.
Graham R. L.;Allison L. J.;Becker D. A.The Oak Ridge Energy Crop County Level Database. December 20 1996. Available at www.esd.ornl/bfdp/oreccl/database.html.
Wilke C. R., 1976, Preliminary Cost Analyses for Enzymatic Hydrolysis of Newsprint, Biotechnol. Bioeng., 6, 155
Gausset al. U.S. Patent No. 3990944 November 9 1976.
Huffet al. U.S. Patent 3990945 November 9 1976.
Platz B.Sunds Defibrator Inc. personal communication April 1998. Results of experimental work conducted at TVA Muscle Shoals Laboratories. Date of tests unknown.
Platz B.Sunds Defibrator Inc. personal communication August 1998.
Ranatunga T. D.;Jervis J.;Helm R. F.;McMillan J. D.;Wooley R. J.The overliming of dilute acid pretreated lignocellulosics Part 1. The fate of inorganics uronic acids and ether soluble organics.Enzyme Microb. Technol. In preparation.
McMillan J. D.;Tucker M. P.;Hayward T. K.;Hatzis C.;Glassner D.Process Qualifier Milestone. Internal Report National Renewable Energy Laboratory Golden CO 31 August 1996.
Hamilton J.Cellulase Production Experiment No. 36: Air/Oxygen 22 Factorial Design. Enzymatic Process Development Team Internal Report. National Renewable Energy Laboratory Golden CO December 1998.
Wales S. M., 1988, Chemical Process Equipment Selection and Design
Grethlein H.;Nelson T.Projected Process Economics for Ethanol Production from Corn; Final Report to U.S. Department of Agriculture North Atlantic Area Eastern Regional Research Center Philadelphia PA July 17 1992.
Short W.;Packey D. J.;Holt T.A Manual for the Economic Evaluation and Energy Efficiency and Renewable Energy Technologies; Report No. NREL/TP‐462–5173. National Renewable Energy Laboratory Golden CO March 1995.
Katzen R.Personal Communication January 1998.
Ingram L. O.;Conway T.;Alterthum F.Ethanol Production by Escherichia coli strains coexpress ing Zymomonas PDC and ADH Genes; US Patent 5 000 000. Issued March 19 1991.
Ingram L. O., 1987, Genetic Engineering of Ethanol Production in, Escherichia coli. Appl. Environ. Microbiol., 53, 2420, 10.1128/aem.53.10.2420-2425.1987
Hettenhaus J.;Glassner D.Milestone Completion Report: Enzyme Hydrolysis of Cellulose: Short‐Term Commercialization Prospects for Conversion of Lignocellulosics to Ethanol; National Renewable Energy Laboratory Internal Report Golden CO 1997
Warren R. A. J., 1998, Carbohydrases from T. reesei and Other Microorganisms, 115
Thomas S. R.;Adney W. S.;Baker J. O.;Chou Y.‐C.;Himmel M. E.Method for Increasing Thermostability in Cellulase Enzymes; U.S. Patent No. 5712142. July 1 1997.
AGRE ‐ 0063: High Temperature Ethanol Fermentation of Lignocellulosic Waste; NF‐2000 Online Database Information 1 July 1992 to 30 June 1993. See www.nf2000.org.