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Bio-oil fractionation and condensation

United States Patent

July 2, 2013
View the Complete Patent at the US Patent & Trademark Office
A method of fractionating bio-oil vapors which involves providing bio-oil vapors comprising bio-oil constituents is described. The bio-oil vapors are cooled in a first stage which comprises a condenser having passages for the bio-oil separated by a heat conducting wall from passages for a coolant. The coolant in the condenser of the first stage is maintained at a substantially constant temperature, set at a temperature in the range of 75 to C., to condense a first liquid fraction of liquefied bio-oil constituents in the condenser of the first stage. The first liquid fraction of liquified bio-oil constituents from the condenser in the first stage is collected. Also described are steps for subsequently recovering further liquid fractions of liquefied bio-oil constituents. Particular compositions of bio-oil condensation products are also described.
Brown; Robert C. (Ames, IA), Jones; Samuel T. (Ames, IA), Pollard; Anthony (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
12/ 551,103
August 31, 2009
This invention was made with funding received from the Department of Energy under grant DE-FG36-07-G087003 and the United States Department of Agriculture under grant 68-3A75-5-233. The U.S. government has certain rights in this invention.