METHOD FOR PRODUCING DISSOLVED PULP

PROBLEM TO BE SOLVED: To provide a method for producing dissolved pulp satisfying an ultrahigh purity (α cellulose content>97%), a high polymerization degree ( >700) and a high whiteness (ISO brightness>90).SOLUTION: Provided is a method for producing dissolved pulp immersing a bleach pulp...

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1. Verfasser:	MORI TOMOO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	APPARATUS THEREFOR 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
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for producing dissolved pulp satisfying an ultrahigh purity (α cellulose content>97%), a high polymerization degree ( >700) and a high whiteness (ISO brightness>90).SOLUTION: Provided is a method for producing dissolved pulp immersing a bleach pulp into cold concentrated alkali, thus hemicellulose is removed to increase the purity of α cellulose, in which the step of immersing the bleach pulp into cold concentrated alkali is a treatment where the bleach pulp is immersed into a sodium hydroxide aqueous solution of 7.0 to 7.5 wt.% in the range of 15 to 100°C for 30 to 90 min. 【課題】超高純度（αセルロース含有率＞９７％）、高重合度（＞７００）、高白色度（ＩＳＯｂｒｉｇｈｔｎｅｓｓ＞９０）の溶解パルプの製造法を提供する。【解決手段】本発明の溶解パルプの製造法は、漂白パルプを冷濃アルカリ中に浸漬することで、脱ヘミセルロースし、αセルロース純度を高める溶解パルプの製造方法において、漂白パルプを冷濃アルカリ中に浸漬する工程が、７．０−７．５ｗｔ％の水酸化ナトリウム水溶液中に漂白パルプを１５−１００℃の範囲で３０−９０分間浸漬する処理であることを特徴とする。【選択図】図１