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System and method for conditioning a hardwood pulp liquid hydrolysate

United States Patent

December 17, 2013
View the Complete Patent at the US Patent & Trademark Office
A system and method for hardwood pulp liquid hydrolysate conditioning includes a first evaporator receives a hardwood mix extract and outputting a quantity of vapor and extract. A hydrolysis unit receives the extract, hydrolyzes and outputs to a lignin separation device, which separates and recovers a quantity of lignin. A neutralization device receives extract from the lignin separation device and a neutralizing agent, producing a mixture of solid precipitate and a fifth extract. The solid precipitate is removed from the fifth extract. A second evaporator removes a quantity of acid from the fifth extract in a vapor form. This vapor may be recycled to improve total acid recovery or discarded. A desalination device receives the diluted extract, separates out some of the acid and salt and outputs a desalinated solution.
Waite; Darrell M. (Bangor, ME), Arnold; Richard (Milford, ME), St. Pierre; James (Milford, ME), Pendse; Hemant P. (Orono, ME), Ceckler; William H. (Hancock, ME)
Red Shield Acquisition, LLC (Old Town, ME), University of Maine System Board of Trustees (Bangor, ME)
13/ 187,818
July 21, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under contract number DE-EE0003364 awarded by the Department of Energy. The Government has certain rights in the invention.