Method of treating annual vascular plants containing...

Details Method of treating annual vascular plants containing... Method of treating annual vascular plants containing...

D - Textiles, Paper

21

C

9/16

D21C 3/00 (2006.01)

Patent

CA 1079009

METHOD OF TREATING ANNUAL, VASCULAR PLANTS CONTAINING HOLOCELLULOSE AND LIGNIN Abstract of the Disclosure A two-step method of treating annual, vascular plants containing holocellulose and lignin particularly bagasse, straws and rush, to recover most of the hemicellulose in the form of pentoses and hexoses without the loss of a substantial amount of lignin and then to convert the residue of fibers and lignin into pulp suitable for making different grades of paper. In the first step the plants are prehydrolized in steam and the vapor of an aqueous dilute acid solution during a short retention time after which the resulting liquid is separated from the fibers and most of the lignin. In the second step the residue of fibers and lignin from the first step is digested for a com- paratively short retention time in an aqueous solution containing an alkali alone or with a sulfur compound, at a comparatively low temperature. In the second step variable desired amounts of the lignin are released from the fibers and the fibers are opened and made suitable for making paper of different grades.

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