Effect of Sulfidity and Temperature on the Rate of the Delignification in Kraft Cooking
The Journal of the Society of Chemical Industry, Japan, 1963 硫化(NaSHまたはH2Sによる)およびスルホン化した材[S材]のソーダ蒸解およびアルカリ処理した材[A材]のクラフト蒸解を速度論的に研究し,クラフト蒸解における脱リグニンの機構について考察した。1)S材のソーダ蒸解における脱リグニンの速度は,蒸解の初期には非常に大きいが(クラフト蒸解のそれに匹敵する),蒸解の進行に応じて急激に減少する。また脱リグニンの活性化エネルギーは初期には小さいが(21～23kcal),末期には大きくなる(38～39kcal)。従って,S材のソーダ蒸解は,蒸解の初期にはクラフト蒸解の機構に類似しているが,末期にはアルカリによるイオウの脱離によってリグニンの縮合が増加して,漸次ソーダ蒸解の機構に近づくものと考えられる。2)クラフト蒸解においては ...
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Xylan Reactions in Kraft Cooking [Elektronisk resurs] : Process and Product Considerations [PDF]
, 2007 Xylan is the main hemicellulose in birch, eucalyptus, and most other hardwood species. During kraft pulping a series of chemical reactions and physical processes involving xylan takes place.
Lindström, Mikael, +2 more
core
Optimizing kraft cooking; pulp yield vs. HexA content and the effect of HexA content after cooking on the bleaching chemical requirement [PDF]
, 2007 Using modern cooking concepts for the manufacture of hardwood kraft pulp, a higher pulp yield is obtained, mainly as a result of high xylan retention. This often leads to a somewhat higher HexA content of the pulp at a given kappa number.
Ragnar, Martin,, Gustavsson, Catrin,
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Effects of mechanical forces on strength delivery in softwood kraft cooking [PDF]
, 2011 Strength delivery of softwood chemical pulps has been previously studied extensively without being able to define the underlying morphological factors such as the initiation of weak points within the fibres.
Salmén, Lennart,, Lundqvist, Fredrik,
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Remoção de hemiceluloses da madeira por tratamento de auto-hidrólise
Ciência Florestal, 2011 The objective of this study was to assess the impact of removing hemicelluloses from chips of eucalyptus wood by self-hydrolysis treatment (H2O) and on the subsequent 'kraft' process behavior and pulps bleachability and quality.
Dalton Longue Júnior +1 more
doaj
Physics-Guided Multi-Task Learning for Small-Sample Soft Sensing: Simultaneous Prediction of Kappa Number and Viscosity in Continuous Kraft Pulping. [PDF]
Sensors (Basel)Zhang B, Shi L, Zhang X, Xu M.
europepmc +1 more source
Recent Advances in Electrocatalytic Treatment and Valorization of Pulping and Papermaking Wastewater. [PDF]
MoleculesBai Y, Liu S, Liu X, Zhao X.
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Optimization of Bleaching Process and Evaluation of Pulp Performance for Super-Arundo Donax Kraft Pulp. [PDF]
Polymers (Basel)Cai Z, Ji X, Liang J, Tian Z, Zhou J.
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Delignification Mechanism in Kraft Cooking
The Journal of the Society of Chemical Industry, Japan, 1963 openaire +2 more sources