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    Oxygen bleaching method of pulp
    1.
    发明授权
    Oxygen bleaching method of pulp 有权

    公开(公告)号：US12104321B2

    公开(公告)日：2024-10-01

    申请号：US18113901

    申请日：2023-02-24

    申请人： Beijing Forestry University

    发明人： Feng Xu ,  Wenqiu Zheng ,  Xiaoyu Wang ,  Tingting You ,  Hongwei Zhu

    IPC分类号： D21C9/10 ,  D21C9/02

    CPC分类号： D21C9/1036 ,  D21C9/02 ,  D21C9/1068

    摘要： An oxygen bleaching method of pulp includes the steps of: adding a solution formulated by a magnesium salt and an activator to an unbleached chemical pulp, stirring to be mixed well, and bleaching by introducing oxygen. The activators are nano zero-valent metals that are conventional, low-cost, and recyclable. These activators can activate low-concentration oxygen at low-temperature in neutral aqueous solution to efficiently generate peroxide anion radicals, so as to promote the generation of hydroperoxide anions and peroxide ions, achieving high efficient delignification. The whole process does not generate waste water, the oxygen consumption is only 50-85% of the original process, the yield is increased by 1.5-2.8% compared with the original system, the pulp brightness is increased to 28-32° SR, and the magnesium salt can be recycled and reused.

    Method for preparing unbleached biomechanical pulp from straw
    5.
    发明授权
    Method for preparing unbleached biomechanical pulp from straw 有权

    公开(公告)号：US11566376B2

    公开(公告)日：2023-01-31

    申请号：US16772509

    申请日：2019-04-29

    申请人： QILU UNIVERSITY OF TECHNOLOGY

    发明人： Xingxiang Ji ,  Ruiming Wang ,  Zhongjian Tian ,  Jiachuan Chen ,  Guihua Yang ,  Yuqian Guo

    IPC分类号： D21H11/12 ,  D21C1/06 ,  D21C5/00 ,  D21C9/02 ,  D21C1/02 ,  D21D1/20 ,  D21B1/06

    摘要： A method for preparing unbleached biomechanical pulp from straw. Straw is used as a raw material, which is firstly pre-treated with hot water and hot steam, added with a small amount of alkali, and then softened by saturation with hot water, enzymatically treated by adding alkaline biological enzymes, refined, and washed. This method has the advantage that the whole production process does not need alkali recovery, thereby avoiding environmental pollution from the source. This technology conforms to the national industrial policy of resource conservation, economic recycling, energy saving and emission reduction. The present invention overcomes the problems of difficulty in recovering the alkali wastewater accompanying straw pulp and serious pollution in the prior art. This is of great significance for the industrial production of straw pulp and the development of the paper industry.

    PROCESS FOR PRODUCING BINDERLESS FORMALDEHYDE-FREE FIBERBOARD AND COPRODUCING FULVIC ACID FROM STRAW
    6.
    发明申请
    PROCESS FOR PRODUCING BINDERLESS FORMALDEHYDE-FREE FIBERBOARD AND COPRODUCING FULVIC ACID FROM STRAW 有权

    公开(公告)号：US20220333308A1

    公开(公告)日：2022-10-20

    申请号：US17640385

    申请日：2021-08-19

    申请人： Bo BAI

    发明人： Bo BAI ,  Jiani BAI ,  Dong WANG ,  Yufang LIU ,  Xiaofei SHI

    IPC分类号： D21H11/12 ,  D21C9/02 ,  D21D1/20

    摘要： A process for producing binderless formaldehyde-free fiberboard and coproducing fulvic acid from straw. All-element purification, activation, saccharification and separation are carried out on the non-wood fiber raw material through boiling and defibering to obtain primarily activated lignin, purified and activated fibers, monosaccharides of hemicellulose and non-wood fibers, and fulvic acid. Deep activation is carried out on activated lignin. The binderless formaldehyde-free fiberboard is produced by using sufficiently activated lignin and low-molecular-weight monosaccharides as a hardener and binder. By sufficiently activating the lignin, comprehensive utilization of straw fiber as resources is realized, and the special requirements of binderless formaldehyde-free fiberboard for high-quality fibrous raw material and high-activity lignin are met. The boiled dilute black liquor was subjected to extraction and concentrated to obtain fulvic acid, thereby avoiding pollution caused by pulping and board production. The distilled water obtained by carrying out evaporative concentration on the boiled dilute black liquor is reused.

    Method for preparing unbleached biomechanical pulp from straws and full utilization of by-products
    7.
    发明申请
    Method for preparing unbleached biomechanical pulp from straws and full utilization of by-products 有权

    公开(公告)号：US20220205179A1

    公开(公告)日：2022-06-30

    申请号：US17561482

    申请日：2021-12-23

    申请人： Qilu University of Technology

    发明人： Zhongjian TIAN ,  Ruiming WANG ,  Xingxiang JI ,  Yinkai GE ,  Jiachuan CHEN ,  Guihua YANG ,  Hao MA

    IPC分类号： D21C5/00 ,  D21C9/02 ,  D21C11/00 ,  C05F5/00 ,  D21C1/02

    摘要： The present disclosure relates to a method for preparing an unbleached biomechanical pulp from straws and full utilization of by-products, which belongs to the technical field of papermaking technology and waste comprehensive utilization. In the present disclosure, straw as raw material for pulping is treated with steam, then a small amount of KOH is added, the straw is softened by hydrothermal saturation, then the temperature of the straw is adjusted, alkaline compound enzymes are added for biological treatment, and finally the straw is refined, where the prepared mechanical pulp can meet the requirements of producing unbleached packaging paper and paper-based materials. At the same time, the by-products are recycled to prepare biomass compound fertilizer, which turns solid waste into treasure and realizes the high-value full utilization of wheat straw. Therefore, it has good practical application value and broad application prospects.