Title:
IONIC-LIQUID-BASED BLEACHING PROTECTIVE AGENT FOR PAPER PULP
Document Type and Number:
WIPO Patent Application WO/2021/082306
Kind Code:
A1
Abstract:
The present invention relates to an ionic-liquid-based ECF bleaching protective agent for paper pulp. The present application involves pre-treating eucalyptus kraft pulp with the ionic-liquid-based bleaching protective agent, followed by ECF bleaching. The addition amount of the bleaching protective agent is 5-15% of the paper pulp. This treatment can effectively dissolve the lignin in paper pulp fibers, and form a protective layer on the surface of the fibers, which improves the subsequent bleaching efficiency, and protects the fibers in the bleaching process. The pre-treatment can improve the cellulose content of the pulp, and also reduce the lignin content, and improve the physical strength of paper from the paper pulp, thereby broadening the application range of broad-leaved wood, such as eucalyptus. This treatment can improve the bleaching effect, can reduce the amount of a bleaching agent, improve the bleaching efficiency and reduce pollution. The present invention has a simple operation, a significant effect and strong practicality, pollution is low, and popularization is easy.
Inventors:
YANG GUIHUA (CN)
CHEN JIACHUAN (CN)
QI LETIAN (CN)
JI XINGXIANG (CN)
LYU GAOJIN (CN)
PENG JIANMIN (CN)
CHEN JIACHUAN (CN)
QI LETIAN (CN)
JI XINGXIANG (CN)
LYU GAOJIN (CN)
PENG JIANMIN (CN)
Application Number:
PCT/CN2020/076725
Publication Date:
May 06, 2021
Filing Date:
February 26, 2020
Export Citation:
Assignee:
UNIV QILU TECHNOLOGY (CN)
International Classes:
D21C9/16; D21C9/10; D21H11/04
Foreign References:
| CN110747681A | 2020-02-04 | |||
| CN101967771A | 2011-02-09 | |||
| CN107541979A | 2018-01-05 | |||
| CN106368030A | 2017-02-01 |
Attorney, Agent or Firm:
FANG & ASSOCIATES (CN)
Download PDF: