Document Type and Number:
Japanese Patent JPS6231110
Kind Code:
B2
Abstract:
A process is provided for pretreating particulate lignocellulosic material to remove heavy metals and resin without any delignification or defibration, which comprises washing particulate lignocellulosic material; compressing the washed material to a solids content of at least 40% to remove absorbed and excess 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 abut 50 DEG to 100 DEG C. for up to approximately 0.75 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, but not any lignin.
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Inventors:
YONASU ARUNE INGUFUARU RINDAARU
Application Number:
JP4971678A
Publication Date:
July 07, 1987
Filing Date:
April 26, 1978
Export Citation:
Assignee:
MO OCH DOMSJOE AB
International Classes:
D21B1/02; D21C1/00