Process for pretreating particulate lignocellulosic material

Details Process for pretreating particulate lignocellulosic material Process for pretreating particulate lignocellulosic material

D - Textiles, Paper

21

C

9/2

D21C 3/00 (2006.01)

Patent

CA 1096559

ABSTRACT OF THE DISCLOSURE A process is provided for pretreating particulate lignocellulosic material to remove heavy metals and resin before delignification or defibration, which comprises washing particulate lignocellulosic material; compressing the washed material to a solids content of at least 40% to remove absorbed liquid; impregnating the compressed material with an alkaline aqueous solution comprising alkali and at least one of a heavy metal ion complexing agent and a heavy metal ion reducing agent; heating the impregnated material at a temperature within the range from about 50 to 170°C for up to approximately one hour; compressing the pretreated material to a solids content of at least 40%; and separating undiluted liquor squeezed out during the compression, while maintaining conditions during the pretreating such that the pH of the squeezed-out liquor is within the range from about 4 to about 9.5; thereby separating heavy metal ions, resins and alkali-extracted substances in solution In the expressed liquor.

302633

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