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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 .

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

Oxygen Delignification | Linde Gas

The delignification may vary in the range of 40-70% depending on the wood raw material and whether one or two reactors in series are used. Unbleached kraft (sulphate) pulp has a lignin content of 3-5%, which after oxygen delignification, can be decreased to about 1.5% or a kappa number of 8-10.

Oxygen Delignification - Praxair

Reactor To Washer Electr Tank HCOD 30 –60% MCOD (Double Stage) 40 –70% MCOD (Single Stage) 0–5 % MCOD (Single Stage) 20 –30% Type of System % Delignication System. Title: Delignification_P-40-4425 Subject: Pulp and Paper delignification Keywords: pulp and paper, delignification, extraction with oxygen and peroxide, peroxide, oxygen .

Delignification and cellulose degradation kinetics models .

The kinetics of oxygen delignification and cellulose degradation of a high kappa softwood Kraft pulp (kappa 65) are studied in a "flow-through" reactor where the pulp was held immobile within the reactor and a fresh oxygenated alkaline solution passes through the pulp mat at a set temperature. The feed solution maintains the alkali and dissolved oxygen concentration inside the pulp mat at .

Oxygen Delignification - Convergence Training

Oxygen delignification produces pulp with a higher yield than pulping to the same kappa number. Oxygen is generated by cryogenic air separation where it is separated from nitrogen and the other components in air. In a high consistency reactor, steam is added to pulp at the top of a downflow reactor. Course Details. Specs. Training Time: 17 minutes.

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).

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 .

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 .

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 .

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 .

An effective metal controller used for enhancing cellulose .

Due to the detrimental effects induced by transition metals on oxygen delignification, it is necessary to explore effective cellulose protector for improving the oxygen delignification efficiency. In this work, chitosan/tripolyphosphate microspheres (C/TPP) with different size were prepared and introduced for alleviating the transition metal ions effects on cellulose degradation.

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.

Medium Consistency Oxygen Delignification Performed with .

gen delignification (LCOD) system using a reactor in the place of a high-pressure retention tower and high shear mixer was installed at a U.S. kraft mill. The system was run with both hardwood (HWD) and softwood (SWD) pulps. Several potential process variables were explored along with the affect of the reactor on fiber integrity. The LCOD .

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 .

Two-Stage O2 Delignification System

The second stage occurs in a larger reactor (residence time of 60 min), where the pressure is lower (3 bars) and the temperature is higher (90o-100o C).This provides the right elements to carry out the slower delignification stage.The longer residence time gives the proper volume to complete the slower stage of the delignification reac-

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.

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 .

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.

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.

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 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.

Oxygen Delignification Kinetics and Selectivity Improvement

Oxygen delignification experiments were conducted on Northeast softwood Kraft pulps at different temperatures, sodium hydroxide charges, reaction times, and pretreatments.

A new CSTR for oxygen delignification mechanism and .

anism by using a new kinetic reactor which allows XYGEN DELIGNIFICATION is widely used for lignin removal before bleaching. The well-known advantages of oxygen delignification are chemical cost sav-ings, yield retention and improved environmental performance. The disadvantages are the high capital cost and lower lignin-cellu-

(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'

EXPERIMENTAL DESIGN AND PROCEDURES

The oxygen delignification reactor and experimental techniques have been described previously by Guven et al. (1996) and Agarwal (1999, 1997). The experiments were performed in a 2-liter, medium consistency oxygen reactor that was equipped with a mixer designed to approximate the low level of mixing in an oxygen up-flow tower (Figure A1).

Simulation Of An Oxygen Delignification Reactor In The .

Simulation Of An Oxygen Delignification Reactor In The Kraft Pulp Production Process 4th October 2018 • The objective of this work is to analyze alternatives for optimization of the delignification process with oxygen, by means of simulation, in the aspect of operating conditions, as well as of the fluid dynamics of the reactor. The

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.

MC technology - ANDRITZ

This is best accomplished with an ANDRITZ AFlow ARF reactor feeder. The AFlow ARF fluidizes the pulp to create flow characteristics similar to water, ensuring smooth feeding that is clog-free. When MC pulp is discharged from a pressurized reactor typically found in oxygen delignification and some bleaching processes, there is again the .

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. Oxygen delignification is the stage at which cellulosic pulp in an alkali solution, is pressurized with oxygen and steam, and then fed into the reactor. .