FOERFARANDE FOER DEFIBRERING AV LIGNOCELLULOSAMATERIAL OCH AOTERVINNING AV BIPRODUKTER

FOERFARANDE FOER DEFIBRERING AV LIGNOCELLULOSAMATERIAL OCH AOTERVINNING AV BIPRODUKTER

Filtrates from the bleaching and delignification of the pulp are recycled for reuse in pulping, separation, and recovery of lignin (66) and other by-products which results in significant energy savings and mitigation if not the elimination of pollution typically associated with bleaching. This inven...

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Bibliographische Detailangaben
Hauptverfasser: WU, CHIH FAE, KATZEN, RAHPAEL, CRONLUND, MALCOLM, WINNER, STEPHEN R, LORA, JAIRO H, LEBLANC, RON, COPAL, GOYAL C
Format: Patent
Sprache:fin
Schlagworte:
APPARATUS THEREFOR
CHEMISTRY
COMPOSITIONS BASED THEREON
DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
ORGANIC MACROMOLECULAR COMPOUNDS
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
TEXTILES
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:Filtrates from the bleaching and delignification of the pulp are recycled for reuse in pulping, separation, and recovery of lignin (66) and other by-products which results in significant energy savings and mitigation if not the elimination of pollution typically associated with bleaching. This invention also relates to products derived from the process and apparatus for carrying out the process. Lignins of various molecular weights and by-products of the pulping process are also recovered (66). The lignins are precipitated in high yields and at a high rate from a black liquor (40) produced by pulping wood at high temperature and pressures with an aqueous lower aliphatic alcohol solvent. As a by-product of this process a purified furfural product is recovered (71). This furfural may be recycled for use in the recovery of the low molecular weight lignin of this process.