Results 271 to 280 of about 18,011,354 (314)
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Kinetic Model for Kraft Pulping Process
Industrial & Engineering Chemistry Research, 2005A new mechanism is proposed for the heterogeneous delignification reaction during the Kraft pulping process. The mechanism consists of three key kinetic steps: (1) adsorption of hydroxide and hydrosulfide ions on lignin; (2) surface reaction on the solid surface to produce degraded lignin products; and (3) desorption of degradation products from the ...
Ling Yang, Shijie Liu
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Journal of Agricultural and Food Chemistry, 2022
This paper presents comments on the recently published article by Lahtinen et al., showing results about study the chemical structure of insoluble residual lignin, the presence of fatty acids in kraft lignin, and the origin of the secoisolariciresinol fragment. The analytical procedures used in the study seem to be reliable. However, in my opinion, the
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This paper presents comments on the recently published article by Lahtinen et al., showing results about study the chemical structure of insoluble residual lignin, the presence of fatty acids in kraft lignin, and the origin of the secoisolariciresinol fragment. The analytical procedures used in the study seem to be reliable. However, in my opinion, the
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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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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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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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ACS Sustainable Chemistry and Engineering, 2018
In Canada, there is a kraft lignin (KL) surplus of ∼1.06 millions (M) t·year–1 (after ensuring pulp mills’ recovery boiler demand). This KL supply can create a US$1.5 billion lignin-based bioproducts industry. Lower molecular weight and higher reactivity
Luana Dessbesell +5 more
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In Canada, there is a kraft lignin (KL) surplus of ∼1.06 millions (M) t·year–1 (after ensuring pulp mills’ recovery boiler demand). This KL supply can create a US$1.5 billion lignin-based bioproducts industry. Lower molecular weight and higher reactivity
Luana Dessbesell +5 more
semanticscholar +1 more source
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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