SULFATE WOOD PULP SHORT-PROCEDURE ECF BLEACHING PROCESS X/Z/D-EOP-D OR X/D/Z-EOP-D

Title:

SULFATE WOOD PULP SHORT-PROCEDURE ECF BLEACHING PROCESS X/Z/D-EOP-D OR X/D/Z-EOP-D

Document Type and Number:

WIPO Patent Application WO/2022/028500

Kind Code:

A1

Abstract:

The present invention relates to the technical field of papermaking, and relates to a sulfate wood pulp short-procedure ECF bleaching process X/Z/D-EOP-D or X/D/Z-EOP-D, comprising the following steps: (1) sequential bleaching (X/Z/D or X/D/Z): carrying out X/Z/D or X/D/Z sequential bleaching on sulfate wood pulp subjected to oxygen delignification to obtain semi-bleached paper pulp; (2) enhanced alkali extraction (EOP): carrying out hydrogen peroxide and oxygen enhanced alkali extraction treatment on the sequentially bleached paper pulp to further dissolve out residual lignin in the pulp; and (3) supplementary bleaching (D): carrying out chlorine dioxide supplementary bleaching on the paper pulp to obtain fully bleached paper pulp (88% ISO). Paper pulp having high whiteness and strength index is obtained by means of the bleaching treatment. Compared with the traditional D-E0-D-D bleaching procedure, a chlorine dioxide bleaching stage is cancelled in the X/Z/D-EOP-D or X/D/Z-EOP-D bleaching procedure, and given the same final paper pulp whiteness, the chlorine dioxide consumption is reduced by 30% or more, and the water consumption is reduced by 20% or more.

More Like This:

JPH09512312	Oxygen bleaching of cellulose pulp
WO/1997/005327	METHOD AND APPARATUS FOR BLEACHING PULP WITH A GASEOUS BLEACHING REAGENT
JP3772991	Delignin of chemical pulp due to peroxide in the presence of transition metals

Inventors:

CHEN JIACHUAN (CN)
YANG GUIHUA (CN)
ZHANG KAI (CN)
TIAN ZHONGJIAN (CN)
JI XINGXIANG (CN)
LYU GAOJIN (CN)
GAO QICHAO (CN)

Application Number:

PCT/CN2021/110717

Publication Date:

February 10, 2022

Filing Date:

August 05, 2021

Export Citation:

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Assignee:

UNIV QILU TECHNOLOGY (CN)

International Classes:

D21C9/10; D21C3/02

Foreign References:

CN111979818A	2020-11-24
CA2031848A1	1991-06-30
CN108474173A	2018-08-31
CN1212310A	1999-03-31
CN1639417A	2005-07-13

Attorney, Agent or Firm:

BEIJING FINELAND IP FIRM (CN)

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