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White liquor oxidation - Valmet

With the air-based system, oxidation takes place in a multi-stage reactor. The air is fed to the reactors from a rotary air blower. Primarily, partial oxidation takes place and the sulfide is converted into thiosulfate. The cost of operation is low as atmospheric air is used to supply the required oxygen.

Oxygen delignification - ANDRITZ

The reactors are pressurized and operate in the medium consistency range. The ANDRITZ process ensures a significant reduction in kappa with low variation (uniform pulp quality). In the ANDRITZ oxygen delignification process, screening is performed after the oxygen stage, prior to washing and bleaching, to increase the wood yield since a .

Online residence time distribution measurement of .

@article{osti_1227702, title = {Online residence time distribution measurement of thermochemical biomass pretreatment reactors}, author = {Sievers, David A. and Kuhn, Erik M. and Stickel, Jonathan J. and Tucker, Melvin P. and Wolfrum, Edward J.}, abstractNote = {Residence time is a critical parameter that strongly affects the product profile and overall yield achieved from thermochemical .

Kinetics of Oxygen Delignification from Cstr and Batch .

O2 delignification Kinetics from CSTR and Batch Reactor Data Yun Ji, M. Clayton Wheeler and Adriaan van Heiningen Department of Chemical Engineering, University of Maine,Orono, 04469-5737 ME, USA ABSTRACT Many kinetic studies of oxygen delignification have been reported in literature. In the

Nickel usage in pulp and paper industry | Nickel Institute

Early oxygen delignification reactors were made from Type 316L (UNS S31603) stainless steel, showing that the process conditions are relatively benign. However, following external chloride stress corrosion cracking under the insulation in some 316L reactors, the industry migrated to standard and lean duplex grades.

Oxygen Delignification - Kempulp

Oxygen delignification has historically been done using various concepts; in several ways, high consistency, medium consistency, one stage or two stages. The state of the art design today is the Kempulp DualOx ® system which offers better selectivity, lower .

Ozone delignification of pine and eucalyptus kraft pulps .

The kinetics of ozone delignification of unbleached pine and eucalyptus kraft pulps is studied at ultralow consistency in a stirred reactor. Ozone consumption was monitored with sensors located in both the liquid and gas phases of the reacting medium, and the results confirm the .

Oxygen delignification process | pulp paper mill

Jul 28, 2015 · Oxygen Delignification is one of the most significant and well proven pulp bleaching process for ECF (elemental chlorine free) and TCF (total chlorine free) bleached pulp production. It is the first stage of the bleaching process; in this case oxygen and alkali are used to eliminate a portion of the residual lignin in the pulp after cooking.

Kinetics of Organosolv Delignification in Batch- and Flow .

Delignification Kinetics in a Flow-through Reactor To determine the effect of continuous replacement of the solvent with fresh liquor during the organosolv process, a kinetic run was performed in a flowthrough reactor at 150°C, using .01 M sulfuric acid in methanol-water (70/30 v/v) äs reaction medium, maintaining a constant liquor flow of 17 .

DELIGNIFICATION OF WOOD AND KRAFT PULP WITH .

that a closed cycle delignification system is feasible. EXPERIMENTAL All reactions were performed in a one liter Parr reactor. The contents were stirred using a turbine impeller at 140 RPM. Nitrogen was bubbled through the solution in the reactor for 15 minutes prior

Elemental Chlorine Free Delignification of Chemical Pulp .

Elemental Chlorine Free Delignification of Chemical Pulp in Flow Through Reactor: Yahya Hamzeh, Soheila Izadyar and Gerard Mortha: Abstract: Based on the known mechanisms of lignin degradation by ClO 2, it has been shown that in conventional ECF delignification stage a significant part of applied chlorine dioxide is consumed in secondary reactions without significant effect on beaching.

Topical Report on XL-2 Project at IP, Jay, Maine .

Maine. The delignification experiments were performed to separate the effects of the 15 minute pressurized reactor from the 60 minute atmospheric tower. An ancillary objective was to determine the effects of mixing on the level of reaction that could be achieved in the oxygen reactor. O2 Delignification System at IP-Jay.

Extended oxygen delignification of high kappa softwood .

Extended oxygen delignification of high kappa softwood pulp in a flow-through reactor | . Oxygen delignification (O-delignification) is an important tool for improving yield, reducing lignin content of pulp and lowering the bleach chemical consumption in the pulp and paper industries. This process is designed after cooking to maximize the .

EP0043342A1 - A method for the delignification of wood and .

delignification Prior art date 1980-06-20 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number EP81810246A Other languages German (de) French (fr) Other versions EP0043342B1 (en .

(PDF) A chemical reactor analysis of industrial oxygen .

A chemical reactor analysis of industrial oxygen delignification Article (PDF Available) in Pulp and Paper Canada -Ontario- 104(12):96-101 · December 2003 with 376 Reads How we measure 'reads'

Elemental Chlorine Free Delignification of Chemical Pulp .

Pulp delignification in flow through reactor: The results obtained from pulp delignification in the flow through reactor were summarized in Table 1. The results showed that the global efficiency of ClO 2 in flow through reactor depended on the temperature and chlorine dioxide concentration used for delignification.

Kinetics and Mechanism of Oxygen Delignification

differential reactor system used frequently for fluid-solid rate studies (so-called Berty reactor) for measurement of oxygen delignification kinetics. In this reactor, the dissolved oxygen concentration and the alkali concentration in the feed are kept constant, and the

Using solubility parameter analysis to understand .

The reactor was then immersed in an oil bath at 200 °C. It took 20 min for the reaction mixtures in the reactor to reach 200 °C. Subsequently, the reactor was kept in the oil bath for another 10 min, and the total heating time was 30 min. Afterwards, the reactor was removed and allowed to .

Oxygen Delignification - Buckman

Accelerate your pulp mill's oxygen delignification process and get superior results with D-Lig 151 from Buckman. It doesn't change the chemistry of the process; it makes it more efficient, enhancing the mass transfer of oxygen to the fiber to achieve a significantly higher rate of lignin removal.

Selectivity improvement and extractive removal by various .

Oxygen delignification A laboratory inclined Parr reactor was used in this study at constant oxygen pressure (1,034 kPa) and consistency (12 %). The mixer speed was kept constant at 20 rpm. The Parr reactor was warmed up to 70 °C. The reactor was then charged with pulp sample (60.00 g o.d.), 0.5 % MgSO4 (5 % w/w solution,

Elemental Chlorine Free Delignification of Chemical Pulp .

Elemental Chlorine Free Delignification of Chemical Pulp in Flow Through Reactor: Yahya Hamzeh, Soheila Izadyar and Gerard Mortha: Abstract: Based on the known mechanisms of lignin degradation by ClO 2, it has been shown that in conventional ECF delignification stage a significant part of applied chlorine dioxide is consumed in secondary reactions without significant effect on beaching.

Oxygen delignification kinetics: CSTR and batch reactor .

In the past, oxygen delignification studies were mostly performed in batch reactors, whereby the caustic and dissolved oxygen concentrations are changing during the reaction. Also the lignin content and cellulose degradation of the pulp are only established at the end of an experiment when the sample is removed from the reactor. To overcome these deficiencies, a differential reactor system .

OXYGEN DELIGNIFICATION -

single reactor. Hardwood pulp needs two reactors if a kappa number reduction of over 35% is required. Table 1 shows typical conditions in oxygen delignification. Table 1. Conditions in oxygen delignification. First stage Second stage temperature (°C) 80 - 85 90 - 105 pressure (bar) 7 - 10 3 - 5 retention time (min) 20 - 40 60 - 80 Valves

Oxygen delignification kinetics: CSTR and batch reactor .

Aug 24, 2007 · In the past, oxygen delignification studies were mostly performed in batch reactors, whereby the caustic and dissolved oxygen concentrations are changing during the reaction. Also the lignin content and cellulose degradation of the pulp are only established at the end of an experiment when the sample is removed from the reactor.

Effect of oxygen delignification on the rate and extent of .

The values reported for mill A and B are typical of those achieved by softwood pulp mills using medium consistency oxygen delignification reactors (Bennington and Pineault, 1999). The oxygen delignification reactor at mill C was a "mini O 2 " system which, at the time of sampling, was operating at sub-optimal temperature (80°C).

3500XD Medium Consistency Pumping Technology | Goulds Pumps

ITT Goulds Pumps is a leading manufacturer of pumps for a wide range of industrial markets — including chemical, mining, oil & gas, power generation, pulp and paper, and general industry. Its global reputation for innovation and quality spans more than 160 years.

Delignification - an overview | ScienceDirect Topics

Delignification, the process of extracting lignin from plant sources, can be done using a variety of methods. Its aim is the disintegration of the lignocellulosic structure into its fibrous components [20]. The delignification processes can be divided into two major classes: chemical and solvent processes. . Reactor configuration and reaction .

White liquor oxidation - Valmet

With the air-based system, oxidation takes place in a multi-stage reactor. The air is fed to the reactors from a rotary air blower. Primarily, partial oxidation takes place and the sulfide is converted into thiosulfate. The cost of operation is low as atmospheric air is used to supply the required oxygen.

New kinetics and mechanisms of oxygen delignification .

Abstract Special oxygen delignification experiments were performed in a differentially operated continuous stirred tank reactor (CSTR). Because the dissolved oxygen and alkali concentrations in the reactor are constant, the rate of lignin removal may be determined from the dissolved lignin content in the outflow stream measured by UV absorption. The delignification kinetics were determined at .

Simulation of an Oxygen Delignification Reactor in the .

The delignification reactor consists of an upflow pressurized vessel with a pulp distributor at the bottom and a pulp discharger at the top. The simulation was performed in 2D axissimetric and 3D geometry. The mesh created for the simulation of the geometries was the free triangular, being refined sequentially until obtaining different degrees .