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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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Ozonation of kraft pulp mill effluents: process dynamics
Journal of Environmental Engineering and Science, 2002Pulp mill wastewater discharged from an aerated stabilization basin (ASB) of a kraft pulp mill was ozonated in an extra-coarse-bubble diffuser contactor. The ozonation process is dynamic. Therefore, modeling the reduction efficiencies of contaminants present in the pulp mill effluent and the ozone gas absorption process became more complex than the ...
M G El-Din, Daniel W Smith
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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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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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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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Effects Of Ozone On Kraft Process Pulp Mill Effluent
Ozone: Science & Engineering, 1992Abstract Effluent from a kraft process pulp mill was studied in a batch reactor for ozone doses between 50 and 200 mg O3/L to identify the relative suitability of ozone application locations in the treatment process and see the improvements in biotreatability of wastewaters from a kraft process pulp mill.
A. Mohammed, D. W. Smith
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Kraft Pulp Process Inspection Service by Andritz
JAPAN TAPPI JOURNAL, 2023Ryo Yoshida, Kanji Hagiwara
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Process simulation of Kraft lignin oxidation for vanillin production
2023Kraft lignin waste generated from Kraft pulping process can be potentially converted to a high value product such as vanillin. This work focused on feasibility study of vanillin production from Kraft lignin by oxidation reaction. A reaction model of Kraft lignin oxidation used in this work was selected from literature.
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