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MAY 2007

Commercialization of DuPont cellulosic ethanol technology accelerated to 2009

The United States Department of Energy (DOE) announced joint funding with Broin Companies in the development of a bio-refinery plant that will commercialize cellulosic ethanol technology developed by DuPont. The DOE funding accelerates the development of a bio-refinery at Broin’s Emmetsburg, Iowa facility to 2009.

In 2003, the DOE provided a four-year, $19 million matching grant to DuPont to develop a technology package to produce cellulosic ethanol. DuPont chose corn stover - the stalks, cobs and leaves that are left in the field after harvest - as the target for its research because of the logistical advantages of harvesting, transporting and producing ethanol from this cellulosic feedstock. DuPont subsidiary Pioneer Hi-Bred International, Inc. has provided market and agronomy insight throughout the project. Deere & Company is working with DuPont on corn stover collection and transportation logistics. The National Renewable Energy Laboratory has been a key partner in the development of the pretreatment and fermentation technology. Led by DuPont, the Integrated Corn-Based BioRefinery research program technology system includes:

  1. Pretreatment of corn stover to separate the lignin from the plant’s cellulose backbone to provide access to the cellulose for further processing.
  2. An enzymatic process called saccharification to convert the cellulosic materials to fermentable sugars.
  3. A novel technology developed to ferment the sugars to make high concentrations of cellulosic ethanol.

In addition, Michigan State University partnered with DuPont engineers to study the agriculture sustainability aspects of harvesting corn plants from the field in a comprehensive life cycle analysis. The results of this study are expected later this year. The Integrated BioRefinery technology system significantly increases the amount of ethanol produced per acre by using both corn grain and stover from the same land.

The technology is licensed for use at Broin’s Emmetsburg facility. Broin will expand a conventional corn dry mill facility in Emmetsburg into a commercial scale bio-refinery designed to utilize advanced corn fractionation and lignocellulosic conversion technologies to produce ethanol from corn fiber and corn cobs.

The expansion will utilize an existing infrastructure with projected costs for the increased capabilities at just over $200 million. The Emmetsburg plant began operations in March 2005 as a 50 million gallons per year dry mill facility. Once the expansion is complete, the facility will produce 125 million gallons per year of ethanol from corn and corn cobs. The expansion will take approximately 30 months.

The first feedstock for the Emmetsburg operation will be corn cobs. In addition, the bio-refinery facility will utilize waste streams from the grain ethanol operations. The lignin that is separated away from the sugars during pretreatment will be used to provide power to both the grain ethanol and cellulose ethanol operations, greatly reducing the need for petroleum feedstocks to either facility.


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