Friday, October 22, 2010

Progress on Cellulosic Ethanol Plugs On


By Robin J. Johnson, Ph.D.

On Monday, October 14, investors learned that INEOS New Planet BioEnergy has received key permits for its commercial scale cellulosic ethanol plant in Indian River County, Florida. Expected to be completed some time in 2012, the plant will convert wastes and energy crops to 8 million gallons of ethanol per year and 6 megawatts of electricity. INEOS New Planet BioEnergy is a joint venture between INEOS Bio and New Planet Energy and is using INEOS Bio's unique combination of thermochemical and biochemical processes to make ethanol.

Many of the currently operating cellulosic ethanol plants use a combination of enzymatic or chemical hydrolysis followed by fermentation using a microorganism. Companies in North America pursuing this technology include Fiberight, AE Biofuels, KL Energy, DuPont Danisco Cellulosic Ethanol, and Iogen. Other companies such as POET and BlueFire Ethanol have similar plants in development. Recently, Brazilian oil giant, Petrobras, teamed up with enzyme powerhouse, Novozymes, to develop a cellulosic ethanol project for processing sugarcane bagasse. (Petrobras also has a joint development agreement for cellulosic ethanol with KL Energy.)

An alternate strategy used by some companies including INEOS Bio, substitutes a thermochemical process, gasification, for the initial hydrolysis step. The product of gasification is synthesis gas (sometimes erroneously called synthetic gas), or syngas. INEOS Bio Ethanol technology employs a patented microorganism, Clostridium ljungdahlii, which is capable of fermenting carbon monoxide and hydrogen in syngas to ethanol. Other companies using gasification as a first step in cellulosic ethanol production include Range Fuels, which broke ground on its commercial plant in 2007, and Enerkem, which has a demonstration-scale plant in operation, a commercial plant under construction, and a commercial plant in the planning stages. Both of these companies use chemical catalytic processes to convert syngas to fuel.

Gasification has several key advantages over typical hydrolysis processes. It is claimed that almost any carbon-containing material can be gasified, though in actuality different materials yield syngas with varying compositions. The reaction itself gives off heat which can be used for drying the starting materials or for generating electricity. Finally, cleaned syngas has a number of other possible uses besides conversion to ethanol. It can be burned to produce heat or catalytically converted to other fuels and chemicals.

The Energy Independence and Security Act of 2007 established a 2011 volume target for cellulosic biofuels in the US of 250 million gallons. As of July 2010, the EPA estimated the market availability for cellulosic biofuels in 2011 to be 5-17.1 million gallons. News of progress on cellulosic biofuels plants is certainly welcome in the face of the glacial progress of the industry to date.

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