公开(公告)号：US20140158315A1

公开(公告)日：2014-06-12

申请号：US14103905

申请日：2013-12-12

Applicant: BASF SE

Inventor： Stefan Erren ,  Dieter Schönhaber ,  Martin Schachtl

IPC: D21C3/04

CPC classification number: D21C3/04 ,  D21C3/02 ,  D21C3/06 ,  D21C3/222

Abstract: A method of producing cellulose from lignocellulosic material by sulfite digestion or sulfate digestion in the presence of a salt of dithionous acid comprises using the salt of dithionous acid in an amount from 0.1 to 4.0 wt. % based on the amount of oven-dry lignocellulosic material.

Abstract translation: 在二硫酸盐存在下，通过亚硫酸盐消化或硫酸盐消化从木质纤维素材料生产纤维素的方法包括使用0.1至4.0重量％的二硫酸盐。 基于烘干木质纤维素材料的量的％。

公开(公告)号：US11725338B2

公开(公告)日：2023-08-15

申请号：US17307060

申请日：2021-05-04

Applicant: BASF SE

Inventor： Stefan Erren ,  Dieter Schönhaber ,  Martin Schachtl ,  Pavel Vassilievitch Osipov

IPC: D21B1/02 ,  D21B1/14 ,  D21C9/10

CPC classification number: D21B1/021 ,  D21B1/14 ,  D21C9/1005 ,  D21C9/1057 ,  D21C9/1063 ,  D21C9/1089

Abstract: In a process for producing bleached mechanical woodpulp, said process comprising the steps of



a) delaminating comparatively large particles of wood, which have optionally been pretreated with chemicals and/or water, into modified particles of wood,
b) grinding the modified particles of wood from a) in one or more refiners,
c) optionally treating the stalk obtained in step b) with oxidative or reductive bleaching agents, a composition Z is present during step a) and/or step b), said composition Z comprising one or more of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4 (Z1), a dithionous acid or dithionous acid derivative generator compound (Z2), a salt of sulfurous acid (sulfite) plus sodium tetraborohydride (Z3) and also optionally additives (Z4).

公开(公告)号：US11015290B2

公开(公告)日：2021-05-25

申请号：US15128755

申请日：2015-03-13

Applicant: BASF SE

Inventor： Stefan Erren ,  Dieter Schönhaber ,  Martin Schachtl ,  Pavel V. Osipov

IPC: D21B1/02 ,  D21C9/10 ,  D21B1/14

Abstract: In a process for producing bleached mechanical woodpulp, said process comprising the steps of a) delaminating comparatively large particles of wood, which have optionally been pretreated with chemicals and/or water, into modified particles of wood, b) grinding the modified particles of wood from a) in one or more refiners, c) optionally treating the stalk obtained in step b) with oxidative or reductive bleaching agents, a composition Z is present during step a) and/or step b), said composition Z comprising one or more of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4 (Z1), a dithionous acid or dithionous acid derivative generator compound (Z2), a salt of sulfurous acid (sulfite) plus sodium tetraborohydride (Z3) and also optionally additives (Z4).

公开(公告)号：US09121135B2

公开(公告)日：2015-09-01

申请号：US14103905

申请日：2013-12-12

Applicant: BASF SE

Inventor： Stefan Erren ,  Dieter Schönhaber ,  Martin Schachtl

IPC: D21C3/02 ,  D21C3/06 ,  D21C3/04 ,  D21C3/22

CPC classification number: D21C3/04 ,  D21C3/02 ,  D21C3/06 ,  D21C3/222

Abstract: A method of producing cellulose from lignocellulosic material by sulfite digestion or sulfate digestion in the presence of a salt of dithionous acid comprises using the salt of dithionous acid in an amount from 0.1 to 4.0 wt. % based on the amount of oven-dry lignocellulosic material.

Abstract translation: 在二硫酸盐存在下，通过亚硫酸盐消化或硫酸盐消化从木质纤维素材料生产纤维素的方法包括使用0.1至4.0重量％的二硫酸盐。 基于烘干木质纤维素材料的量的％。