KONTROLLE DER GELÖSTEN FESTSTOFFE BEI DER ZELLSTOFFHERSTELLUNG

A single vessel digester system for digesting cellulosic fibrous material comprises a substantially upright vessel (221) having a top (220) and bottom (222) with a slurry of comminuted cellulosic material to be digested introduced adjacent the top (220), and pulp withdrawn adjacent the bottom (222);...

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Hauptverfasser: RYHAM, C, CHASSE, FRED, MARCOCCIA, S, PHILLIPS, R, RICHARDSEN, T, LAAKSO, O, PROUGH, ROBERT
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creator RYHAM, C
CHASSE, FRED
MARCOCCIA, S
PHILLIPS, R
RICHARDSEN, T
LAAKSO, O
PROUGH, ROBERT
description A single vessel digester system for digesting cellulosic fibrous material comprises a substantially upright vessel (221) having a top (220) and bottom (222) with a slurry of comminuted cellulosic material to be digested introduced adjacent the top (220), and pulp withdrawn adjacent the bottom (222); the vessel having a continuous cooking zone disposed at a first level of said digester (221), and including a first screen (225) for removing liquor from the cooking zone and a cooking circulation loop (230, 235, 238, 239) associated with said first screen (225) for circulating removed liquor to the interior of said digester (221) near the vicinity of said first screen (225); and an extraction screen (245) with extraction conduit (246) located at a second vertical level in said vessel (221), below said first level, and having means for adding dilution liquid (241; 242), having a lower dissolved organic material concentration than the liquor removed in said cooking circulation loop (230, 235, 238, 239), to said cooking circulation loop (230, 235, 238, 239), to reduce the concentration of DOM in the digester and thereby increase the strength of the pulp so-produced.
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subjects ACCESSORIES FOR PAPER-MAKING MACHINES
APPARATUS THEREFOR
CALENDERS
CHEMISTRY
COMPOSITIONS BASED THEREON
DERIVATIVES THEREOF
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PAPER-MAKING
POLYSACCHARIDES
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
title KONTROLLE DER GELÖSTEN FESTSTOFFE BEI DER ZELLSTOFFHERSTELLUNG
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