Results 101 to 110 of about 8,681 (223)
BioResourcesPartial delignification of alder wood specimens was performed with alkaline sulfite and peracetic acid (PAA) methods, and subsequently the delignified samples were saturated with furfuryl alcohol, as an eco-friendly chemical.
Seyed Mohammad Hossein Yahyaee +3 more
doaj
Apparent and actual delignification response in industrial oxygen-alkali delignification of birch kraft pulp [PDF]
, 2003 The time-dependent behavior of material that affects the kappa number of birch kraft pulp was experimentally tested in an industrial, two-stage, oxygen-alkali delignification process. The pulps were leached, and the leached material was divided into four
Ala-Kaila, K. +3 more
core
Mill experience of oxygen delignification.
JAPAN TAPPI JOURNAL, 1988 The M-C oxygen delignification system for the eucalyptus line of our mill has started operation in January 1986.The Kappa number and viscosity reduction are around 49 % and 19% respectively.Also, the good results are shown in terms of brightness and dirt content.Whereas, the reduction of total effective chlorine consumption and COD in the bleaching ...
openaire +2 more sources
Improved oxygen delignification of bisulfite pulps [PDF]
, 1996 The role of peracetic acid in improving a second oxygen delignification step of softwood bisulfite pulp was investigated. The results showed that peracetic acid improved the degree of delignification in a second oxygen stage, probably by increasing the ...
Nilsson, Helena +3 more
core
Delignification of Kraft-AQ Southern Pine Pulp with Hydrogen Peroxide Catalyzed by Mn(IV)2-Me4DTNE [PDF]
, 2000 Over the years, hydrogen peroxide has been used to improve the brightness of pulp at the end of a bleaching sequence. However, the degree of delignification achieved by a hydrogen peroxide stage is usually modest.
Cui, Yu
core
On the nature of the selectivity of oxygen delignification [PDF]
This work has focused on oxygen’s role in the delignification process within the context of pulp production. We have investigated the role of oxygen in a complex set of chemical reactions taking place during this process, including both oxidative and non-
Esteves, Cláudia V., +13 more
core +1 more source
Oxygen Delignification Kinetics and Selectivity Improvement [PDF]
, 2003 Pulp strength loss during oxygen delignification is caused by cellulose chain cleavage resulting fiom attack by oxygen-based radicals generated through reactions with lignin.
Violette, Steven M.
core +1 more source
Pulp Pretreatments for Improved Selectivity and Extended Oxygen Delignification [PDF]
, 2002 Oxygen delignification has developed steadily since it was introduced commercially in 1970 in South Africa and virtually all new fiber lines incorporate an oxygen delignification system following the digester prior to the bleach plant.
Dang, Zheng
core +1 more source
Impact of dissolved matter in the oxygen delignification stage [PDF]
, 2017 The presence of dissolved matter in the pulp suspension in an oxygen (O-2) delignification stage, consisting mainly of dissolved lignin, is normally considered to negatively affect the delignification rate due to the competing reactions between the fiber
Wilke, Caroline, +2 more
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