Method of processing lignocellulosic feedstock for enhanced...

C - Chemistry – Metallurgy – 13 – K

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C13K 1/02 (2006.01) C08H 8/00 (2010.01) A23L 1/308 (2006.01) C08B 1/00 (2006.01) C12P 7/10 (2006.01) C12P 19/02 (2006.01) C13K 13/00 (2006.01)

Patent

CA 2438984

The present invention provides a method of producing xylose from lignocellulosic feedstock. The method comprises disrupting lignocellulosic feedstock; leaching the lignocellulosic feedstock by contacting the feedstock with at least one aqueous solution for a period greater than about 2 minutes to produce a leached feedstock and a leachate; removing the leachate from the leached feedstock; acidifying the leached feedstock to a pH between about 0.5 and about 3 to produce an acidified feedstock, and; reacting the acidified feedstock under conditions which disrupt fiber structure and hydrolyze a portion of hemicellulose and cellulose of the acidified feedstock, to produce a composition comprising xylose and a pretreated feedstock. The xylose may be purified from the pretreated feedstock or it may be converted to ethanol with the pretreated feedstock.

L'invention concerne un procédé de production de xylose à partir d'une charge lignocellulosique, qui consiste à disloquer ladite charge, à la lixivier en contact avec au moins une solution aqueuse pendant au moins 2 minutes de façon à produire une charge lixiviée et un lixiviat; à évacuer le lixiviat de la charge lixiviée; à acidifier ladite charge lixiviée à un pH se situant entre environ 0,5 et environ 3 afin de produire une charge acidifiée et à la faire réagir dans des conditions qui permettent de disloquer la structure fibreuse et d'hydrolyser une partie d'hémicellulose et de cellulose de la charge acidifiée, en vue de produire une composition renfermant le xylose et une charge prétraitée. Le xylose peut être purifié à partir de la charge prétraitée ou transformé en éthanol avec la charge prétraitée.

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