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Patent Searching and Data


Title:
DISSOLVING PULP PREPARATION METHOD AND DISSOLVING PULP
Document Type and Number:
WIPO Patent Application WO/2020/010728
Kind Code:
A1
Abstract:
A dissolving pulp preparation method comprises: S1) steaming and cooking wood chips to acquire a brown stock; S2) subjecting the brown stock to oxygen delignification to acquire an oxygen-delignified stock; S3) mixing the oxygen-delignified stock and a hemicellulase to perform enzymatic hydrolysis to acquire an enzyme-hydrolyzed stock; and S4) bleaching and performing paper-making on the enzyme-hydrolyzed stock to acquire a dissolving pulp. The hemicellulase is added after the oxygen delignification to remove hemicellulose in the stock, such that lignin can also be removed easily, thereby facilitating bleaching of a dissolving pulp, reducing the amount of bleaching agent used, and causing a reaction to be mild. In addition, cellulose is retained to the greatest extent during removal of the hemicellulose and lignin, thereby improving the pulp fiber content and performance of the dissolving pulp, and reducing pollution caused by wastewater.

Inventors:
WANG BO (CN)
YANG HENG (CN)
ZHANG SHOUGUO (CN)
Application Number:
CN2018/109259
Publication Date:
January 16, 2020
Filing Date:
October 08, 2018
Export Citation:
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Assignee:
ASIA SYMBOL SHANDONG PULP AND PAPER CO LTD (CN)
International Classes:
D21C9/147; D21C3/02; D21C5/00; D21C9/10; D21C9/14; D21C9/16
Foreign References:
CN104379833A2015-02-25
CN103122594A2013-05-29
CN103122594A2013-05-29
CN103321080A2013-09-25
CN102108646A2011-06-29
US6254722B12001-07-03
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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