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Thursday, August 6, 2020 | History

3 edition of Equilibria and balances of metal ions in kraft pulping found in the catalog.

Equilibria and balances of metal ions in kraft pulping

Jouni Karhu

Equilibria and balances of metal ions in kraft pulping

by Jouni Karhu

  • 208 Want to read
  • 30 Currently reading

Published by Åbo Akademi University, Faculty of Technology in Åbo .
Written in English

    Subjects:
  • Sulfate pulping process.,
  • Metal ions.

  • Edition Notes

    StatementJouni Karhu.
    Classifications
    LC ClassificationsTS1176.6.S9 K37 2008
    The Physical Object
    Pagination1 v. (various pagings) :
    ID Numbers
    Open LibraryOL22688895M
    ISBN 109789521220616
    LC Control Number2008468662
    OCLC/WorldCa276408025

    The effects of Ca2+, Mg2+, Al3+, and Fe3+ on the flotation behaviors of apatite, dolomite and quartz were investigated through a micro-flotation test, and the influence of calcium ions on the flotation of these minerals was further elucidated by solution chemistry study, zeta potential measurement, and X-ray photoelectron spectroscopy (XPS) analyses.   Frederick, Jr, W J, Rudie, A W, Schmidl, G W, Sinquefield, S A, Rorrer, G L, Laver, M L, Yantasee, W, and Ming, D. Control of the Accumulation of Non-Process Elements in Pulp Mills with Bleach Filtrate Reuse: A Chemical Equilibrium Approach to Predicting the Partitioning of Metals in Pulp Mill and Bleach Plant Streams. United States: N. p.,

    Pulping and Papermaking Chemical Reaction Engineering in Skeletal Isomerization All-Solid-State Ion Sensors. Single-Piece and Solid-Contact Sensors for Chloride and Lithium Ions Equilibria and Balances of Metal Ions in Kraft Pulping Processes Predicting the Properties of Bioactive Glasses" on November 2, Opponent: Dr. Fredrik Sandelin. Introduction. Water contamination caused by heavy-metal ions generated from alloys, pigments, electroplating, mining, metallurgical activities, nuclear power plant operations, aerospace industries, electrical contacts, printing, and the manufacture of paper, rubber, plastics, and batteries [1, 2] is a global problem receiving worldwide extended persistence of water contamination.

    water consumer among the kraft process stages. The first effort at closing a kraft process was at the Great Lakes Forest Products bleached kraft mill in Thunder Bay, Ontario in the mids. Later, Norrstrom et al. () carried out a conceptual study of the closed cycle mill for the production of bleached chemical pulp [3]. Trace Metals in Wood and Pulping Generalized behavior of metals Calcium Oxalic Acid Barium Chemical Fundamentals Acid and Base Equilibria Precipitation Equilibria (Solubility Product) Ion Activity Supersaturation Case Studies: Digester (White Liquor) Chip Strainer.


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Equilibria and balances of metal ions in kraft pulping by Jouni Karhu Download PDF EPUB FB2

TWO PHASE EQUILIBRIA OF METAL IONS IN PULPING UNIT OPERATIONS: FROM IMPREGNATION TO OXYGEN BLEACHING J. Karhu, P. Snickars, L. IIarju and A. Ivaska Laboratory o Analytical Chemistry, Process Chemisty Group, Abo Akademi University, f Biskopsgatan 8, FIN Turku-Abo, Finland ABSTRACT Two phase equilibria of metal ions at diffcrent steps of the pulping Author: J.

Karhu, P. Snickars, L. Harju, A. Ivaska. Request PDF | Two-phase equilibria of metal ions in pulping process from impregnation to oxygen delignification.

Part I: Metal ion concentrations | Two-phase equilibria of metal ions at different. Snickars's 4 research works with 25 citations and 40 reads, including: Two-phase equilibria of metal ions in pulping process from impregnation to oxygen delignification.

Part II. Metal ion balances. inducing accumulation of metal ions in the process liquors. Calcium can cause scale formation on the digester and black liquor evaporators. Therefore it is crucial to manage the metal ion flows in a pulp mill. Karhu et al. (a, b) have studied two-phase equilibria of metal ions in pulping process from impregnation to oxygen delignification.

Karhu's 7 research works with 75 citations and reads, including: Two-phase equilibria of metal ions in pulping process from impregnation to oxygen delignification.

Part II. Metal ion balances. equilibria of metal ions in pulping proce ss from impregnation to exchange reaction between monovalent and di valent metal ions on kraft pulp Tianjin, China, Book A.

Su, P. aqueous metal ion speciation, or metal precipitation on the metal ion distri-bution between the pulp and liquid phases. The model includes equilibrium mass-action expressions for hydrogen and metal ion distribution between wood pulp fibers and solution, an adsorption site balance, material balances for adsorbed metal ions, and a charge balance.

1. Introduction. A number of models describing the interaction between metal ions and wood fibers have been presented in the literature. Towers and Scallan have shown that the distribution of mono- and divalent metal ions between a cellulose fiber and the surrounding solution can be modeled by using an ion-exchange model based on the Donnan theory.

In the Donnan equilibrium framework. Metal ion balances at different stages of the pulping process have been studied. Pulp samples were taken from two modern kraft pulp mills using modified batch cooking process.

Pulp consistency Ozone charge Effect of pH Time Temperature Additives Metal ions Dissolved organic matter Pulp processing before ozone stage Alkaline extraction after ozone stages.

The amount of metal ions sorbed at equilibrium per unit mass of sorbent was evaluated according to: (1) q e = C 0-C e D where C 0, C e denote the initial and equilibrium metal concentrations in solution, respectively, and D is the sample’s dose.

The influence of the initial solution’s pH on nickel sorption at equilibrium was further. Two phase equilibria of metal ions in pulping process from impregnation to oxygen delignification. Part II. Metal ion balances. Karhu, J., Snickars, P., Harju, L., Ivaska, A.

Paper and Timber, 85() Two phase equilibria of metal ions in pulping process from impregnation to oxygen delignification. Part I. Metal ion concentrations. Cake washing of freely mobile ions was described by an advection–dispersion equation combined with the Donnan equilibrium and an overall ion transfer model between the external liquid phase and the fiber phase of kraft pulp.

The ion exchange rate coefficients between the phases were determined from the earlier published leaching test results.

Kinetics and sorption equilibria of the binding of Ca 2+ and Na + ions in kraft pulps have been reported in the literature (Duong et al.,Duong et al.,Duong et al., ).

In case of unbleached kraft pulps Ca 2+ sorption follows Langmuir isotherm, at higher pH the dissociation of phenolic groups also has to be considered. “Fibre charge from potentiometric titration of kraft pulp and Donnan equilibrium theory,” Nordic Pulp and Paper Res. 13, Charlet, L., and Tournassat, C.

“Fe(II)-Na(I)-Ca(II) cation exchange on montmorillonite in chloride medium: evidence for preferential clay adsorption of chloride – Metal ion pairs in seawater. For his doctoral thesis Jouni made research on equilibria and balances of metal ions in kraft pulping.

That included not only metal ion concentrations and flows in industrial processes, but also characterisation of acid groups in kraft pulp fibres and equilibria of ion exchange reactions. Metal Ion Partitioning with Post Brown Stock Pulp 82 1% Consistency Equilibrium and Metal Profile of Original Pulp 83 Acidified 1% Consistency Equilibrium 86 Elevated Calcium 1% Consistency Equilibrium 86 % and % Consistency Equilibriums 87 Metal Ion Partitioning with Acid Washed Pulp Study on metal ion affinities to oxygen delignified hardwood kraft pulp by a column chromatographic method Procedure: A column (65•2 cm and •2 cm) packed with pulp Natural ion content removal (EDTA, HNO 3) and a rinsing with deionized water Addition of mixtures of metal ions.

Desorption of metal ions from oxygen-bleached hardwood and softwood kraft pulps by different chelation treatments were studied. The main focus was on desorption of manganese, iron, and magnesium ions, but also on desorption of some other common metal ions.

The metal ion concentrations were determined by the DCP-AES and ICP-MS techniques. a metal ion in the fibre line is to be calculated, the formation constants of the main species must be known. When pulp is present, the acid-base equilibria of the pulp as well as the interaction between metal ions and the active groups of the pulp must also be considered.

However, many of the. A kraft pulp mill with the bleaching sequence OO D0(EO)D1(PO) was sampled for pulps, carry over and filtrates. Data from the mill were compared to the outcome from a commercial process simulation tool (WinGEMS) equipped with the extension tool MeteQ.

This tool was used to calculate the distribution of metals at equilibrium.The ASAM pulping process can be regarded as leading to a combination of the pulp properties of kraft and sulfite processes. In ASAM pulping with the usage of alkali and sodium sulfite (Na 2 SO 3), the depolymerization properties of kraft process and the hydrophilicity-creating properties of sulfite process were illustrated (Shukry et al.

).where q e is the amount of metal ions adsorbed at equilibrium (mg/g), C 0 is the initial concentration of metal ions (mg/L), C e is the equilibrium metal ions concentration (mg/L), V is the volume of solution (L) and m is the mass of the biosorbents (g). The prepared solutions of nickel(II) and cadmium(II) ions were placed in conical flasks.