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Control Strategy Scheme for the Prehydrolysis Kraft Process
Computer Aided Chemical Engineering, 2018Abstract This paper presents a control strategy scheme for the prehydrolysis stage in the prehydrolysis kraft process. The key element of the proposed control strategy is a softsensor, which estimates the rate of the unobservable reactions based on a physicochemical dynamic model of the process.
Sixta, Herbert +3 more
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Odor generation in the kraft process
Journal of Chemical Education, 1975Considers the kraft process, sources of odors in the process, and the chemistry of the formation of those odors.
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The Problems in Delignification of Dry Wood by Kraft Process
Key Engineering Materials, 2016The objective of this study was to assess the causes of the problems arising in the CBC kraft cooking of several types of hardwood chips particularly in view of high dry matter but also in view of chip thickness and character of wood.High dry matter of processed chips influences negatively delignification.
Anton Geffert +2 more
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Surface Modification of Kraft Lignin by Mechanochemical Processing with Sodium Percarbonate
Biomacromolecules, 2023In this article, we present a novel one-pot mechanochemical reaction for the surface activation of lignin. The process involves environmentally friendly oxidation with hydrogen peroxide, depolymerization of fractions with high molecular mass, and introduction of new carbonyl functions into the lignin backbone.
Friedrich Fink +4 more
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Bioproducts Process Pathways for Kraft Paper Mills
Journal of ASTM International, 2010Energy use in the United States is heavily reliant on imported fossil fuels. Finding a way to produce renewable fuels that can replace these fossil fuels will address national security threats, sustainability concerns inherent in the use of fossil fuels, and keep manufacturing in rural areas.
Catherine M. Dickerson, Jonathan Rubin
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The Development of Defoamer for Kraft Pulping Process
JAPAN TAPPI JOURNAL, 2004苛性ソーダと硫化ソーダを用いて,木材チップを高温高圧下で蒸解し,パルプを取り出す方法をクラフトパルプ法(KP法)という。このとき,化学的に変性したリグニンがアルカリ液中に溶出する。このアルカリ液は黒液と呼ばれ,溶出したリグニンが界面活性をもつために非常に泡立ちやすい性質になっている。クラフトパルプ製造工程ではこの黒液がパルプの希釈水や洗浄水,分散液として循環使用されるため,泡が大量に発生する。泡はパルプの洗浄速度を下げ生産性が低下するほか,洗浄効率を低下させパルプの白色度が低下するなどパルプの品質に悪影響を及ぼす。そこで,泡をコントロールすることは,パルプの生産性と品質を安定化させために重要なポイントとなる。泡をコントロールする方法には機械的方法と化学的方法があるが ...
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Development of Continuous Cooking Process for Kraft Pulping
JAPAN TAPPI JOURNAL, 2008カミヤ社が1949年に連続蒸解技術を開発して以来，連続蒸解技術が商業的に注目され始め，1980年代に入ると，異なったニーズに応じて多くの連続蒸解システムが開発された。その後，生産規模及び環境保全への対応，蒸解収率の向上，操業の安定化，漂白効率の改善，最終製品の品質要求を満たすパルプ品質確保のために，COMPACT COOKING™の連続蒸解システムが開発された。2000年代になると，パルプ製造の原料である木材チップと重油の高騰から製造コストの低減を目的とした蒸解プロセスを含むプロセス面での改善が試みられている。本稿では，まず連続蒸解釜の変遷，そしてクラフトパルプ法の連続蒸解プロセスの進歩を振り返る。次に1ベッセル気相／液相釜の低温蒸解技術が開発された背景，及びこの技術の特徴について紹介し ...
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Comparison of different kraft lignin-based vanillin production processes
Computers & Chemical Engineering, 2018Abstract This work employed a systematic methodology and process intensification concepts to improve the state-of-the-art vanillin production process from kraft lignin. Particular focus was put on the use of different product separation techniques, including solvent extraction using ethyl acetate, benzene, organic nanofiltration, and adsorption by ...
Nattanan Wongtanyawat +7 more
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Mathematical Modeling of Multistage Evaporator System in Kraft Recovery Process
2016In order to reduce the energy consumption of the concentrating the black liquor in Kraft recovery process in paper mill, a mathematical models is developed and proposed for the analysis of multi stage evaporator (heptad’s effect evaporator system). These multistage evaporator is modeled based on the flow of black liquor and steam operation option.
Om Prakash Verma +3 more
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Corrosion Rate Monitoring in Kraft Pulping Process Liquors
CORROSION 1986, 1986Abstract Corrosion monitoring in alkaline sulfide kraft pulping liquors has been performed by means of the linear polarization resistance and electrical resistance methods. Corrosion rates obtained in real and simulated white liquors are compared with weight loss results.
D. C. Crowe, R. A. Yeske
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