CleanTech Biofuels, Inc. Announces Licensing Agreement with HFTA and the University of California Berkeley

Business Wire, April 15, 2008

ST. LOUIS -- CleanTech Biofuels, Inc. (OTCBB: CLTH) announced it has entered into an exclusive worldwide sublicense agreement with HFTA of Livermore, California to license technology developed by scientists at the University of California, Berkeley.

The patented technology utilizes nitric acid rather than sulfuric or hydrochloric acid to hydrolyze cellulosic material for the production of ethanol and other fuels from biomass. Sulfuric or hydrochloric acids are typically used for most thermo-chemical hydrolysis processes. CleanTech believes that the HFTA/University of California Berkeley nitric acid process represents state-of-the-art technology in the cellulosic ethanol industry.

In addition to our exclusive rights to utilize municipal solid waste as feedstock for the HFTA technology, CleanTech has also obtained a nonexclusive worldwide license for all other cellulosic biomass feedstocks for the production of ethanol.

The licensed technology is described in U.S. Patents No. 5221357, 5366558, 5536325, 5628830, and 6019900. The sublicense agreement is with HFTA, a California corporation formed by the developers of the technology while at the University of California at Berkeley.

CleanTech Biofuels, Inc.

CleanTech Biofuels, Inc. is a development stage company that is developing cutting edge waste to clean fuel technologies. We have licensed and are developing our core patented technologies which, when combined, can be used to convert the cellulosic material in municipal solid waste, green waste, and other cellulosic waste materials into fermentable sugars for the production of ethanol.

Our pressurized steam classification technology uses a rotating pressure vessel to separate and clean the cellulosic material in curbside garbage, preparing it for use as a feedstock for the conversion to fermentable sugars.

Our hydrolysis technology utilizes dilute acid in a two-stage continuous process to convert the cellulosic feedstock into fermentable sugars which can be distilled into fuel grade ethanol.

We believe that our combined technologies will enable the production of ethanol from cellulosic waste streams at a lower cost than from grain or other agricultural feedstocks. Our combined technologies will avoid the immense consumption of water and farmland that plague grain ethanol producers, with the added benefit of recycling garbage and reducing the amount of waste disposed of in landfills by as much as ninety percent.

By focusing on cellulosic biomass produced from curbside garbage where an existing collection and disposal infrastructure has existed for many years, our business model presents substantial economic advantages relative to other models dependant on agriculturally derived feedstocks or wood waste for the production of cellulosic ethanol.

HFTA

HFTA was formed by University of California, Berkeley, scientists who developed technology using nitric acid to hydrolyze biomass. This patented technology is an efficient method to form and recover sugars from lignocellulosic material (biomass) for the production of ethanol and other products. HFTA has an exclusive license for this technology from the Regents of the University of California. Further information may be found at http://ipira.berkeley.edu/page.php?nav=76. HFTA may be contacted at 650-343-6450.