Abstract
Since June 2009, we have been operating a pilot plant to evaluate a process for producing bio-ethanol from lignocellulosic biomass, wherein lignin is removed using soda-anthraquinone（ soda-AQ） cooking as a pretreatment for enzymatic saccharification. By the end of September 2012, we completed all pilot plant operations and obtained the following results. Using a semi-batch cooking method, Sugi （Cryptomeria japonica） soda-AQ pulp was produced at an yield of 44%. The Sugi pulp was hydrolyzed using a commercial cellulase to obtain a sugar yield of 97%. The produced sugar solution was concentrated from 3.1% to 7.4% using a reverse osmosis membrane and then fermented using a yeast to obtain an ethanol yield of 96.5%. The volume of ethanol produced was then calculated to be 216 L from 1 BDT of Sugi chips.
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