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US Patent for Circular utilization method in pulping and .

3) Starting the delignification reaction in the reaction tower for oxygen delignification, and then obtaining a pulp with a K value of 10-14 (equivalent to a Kappa number of 13-19.8). Preferably, the hardness of the pulp obtained after oxygen delignification in Step 3) is the one with a Kappa number .

Oxygen delignification as a pretreatment for the enzymatic .

(1987) 30 Figure 1.21 Relationship between kappa number and pulp viscosity 31 Figure 1.22 Effect of lignin content on the ease of hydrolysis of grasses pretreated using oxygen delignification 32 Figure 3.1 The lab-scale stirred tank reactor 35 Figure 5.1 Effect of temperature and oxygen partial pressure on kappa number 48 Figure 5.2 Effect of .

US5441603A - Method for chelation of pulp prior to ozone .

A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater than about 13 cps; and further delignifying the partially delignified pulp with an effective amount of ozone for a sufficient time to obtain a substantially delignified pulp having a K No. of about 5 .

The electrochemical mediation of oxygen delignification of .

The relationship between the lignin content and Kappa number of pulp is very goodfor bleachable pulps.9Chapter 2. Background and Literature ReviewFor Kraft pulp,Lignin % = 0.147 x Kappa number^(1)Conventional oxygen bleaching reduces the Kappa number of pulp from around 30 to 15 andreduces the viscosity from around 40 to 25 cP.10Chapter 2.

Handbook on Pollution Prevention Opportunities for .

The kappa number reflects the amount of lignin remaining in the pulp. Since it is lignin that imparts color to the pulp and is responsible for yellowing and aging of paper, the primary objective of the bleached kraft process is to reduce the pulp's lignin content (or kappa number) as much as possible.

Reference Document for the Production of Pulp - MAFIADOC.COM

During the ten years, at an average of 1.4 % annual increase in pulp production, the number of pulp mills decreased from 249 to 192. At the same time, the average capacity of the pulp mills in Europe increased from 165 100 tonnes/year in the year 1998 to 239 000 in the year 2008. 60 Number of pulp mills 50 40 22.9% 17.6% 16.3% 17.6% 14.6% 17.2% .

Pretreatments of natural fibers and their application as .

Jul 01, 2009 · Free Online Library: Pretreatments of natural fibers and their application as reinforcing material in polymer composites--a review.(Technical report) by "Polymer Engineering and Science"; Engineering and manufacturing Science and technology, general Fiber reinforced composites Properties Fibrous composites Graft copolymers Natural fibers Usage Polymer composites Polymer engineering .

Elemental Chlorine Free Delignification of Chemical Pulp .

However, when high temperature and small charges of ClO 2 was applied, higher DE kappa numbers DE kappa number were obtained in flow through reactor compared to batch. These results indicated that temperature played an important role in delignification performance in flow through reactor. Inorganic chlorine compounds evolution in flow through reactor: Under acidic bleaching condition .

Selective Degradation of Lignin Polymer by Chlorine .

Selective Degradation of Lignin Polymer by Chlorine Dioxide During Chemical Pulp Delignification in Flow Through Reactor Article in Polymer-Plastics Technology and Engineering 47(9):931-935 .

Handbook On Pulp And Paper Processing by Npcs Board Of .

The effect of alkali addition in oxygen delignification on Kappa No. of pulp and brightness is shown in Fig. 3. Kappa No. of the pulp reduced sharply with 2% alkali and then steadily upto 5% alkali. The brightness of the pulp improved moderately which is caused by delignification .

Handbook On Pulp And Paper Processing by Npcs Board Of .

The effect of alkali addition in oxygen delignification on Kappa No. of pulp and brightness is shown in Fig. 3. Kappa No. of the pulp reduced sharply with 2% alkali and then steadily upto 5% alkali. The brightness of the pulp improved moderately which is caused by delignification .

Effective Catalytic Delignification and Fractionation of .

The exptl. results revealed high selectivity of the residual lignin oxidn. during oxygen delignification catalyzed by 1-4, though the final kappa no. of delignified pulps varied significantly. This was related to the removal of hexeneuronic acid residues at low pH diminishing the corresponding pulp kappa .

Pulp and Paper Making Process - Assignment Point

INTRODUCTION. Pulp is the fibrous cellulosic material used in the production of paper. Wood is the principal raw material for the production of pulp; but bamboo, cotton, linen, rags, straw, bagasse, etc are also used. Chemical pulp production is the cooking of the wood raw material with chemicals.Cooking is necessary to remove the binding agents from the wood.

Modified digestion of paper pulp followed by ozone bleaching

The extended delignification pulp is then subjected to ozone bleaching, with an ozone dosage of less than 1.0% . kappa number, and other parameters . with an ozone dosage of less than 1.0% on pulp by weight, to produce a chlorine-free bleached pulp with brightness of about 90 CPPA or greater. 2.

SPCI (NPPRJ) - Advanced search

Nordic Pulp & Paper Research Journal (NPPRJ) is an international scientific magazine covering science and technology for the areas of wood or bio-mass constituents, pulp and paper and including new fiber-based materials, recovery and by-products from pulping processes, bio-refining and energy issues.

Delignification - an overview | ScienceDirect Topics

The pulp is said to be suitable for oxygen delignification down to a Kappa number of 12. The first commercial demonstration of the process was carried out in Varkaus, Finland. Another modification of the kraft process is to replace about 20% of the sodium sulfide with sodium sulfite in .

(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 394 Reads How we measure 'reads'

Pollution Prevention For The Kraft Pulp And Paper Industry .

----- BLEACHING NUMBER TITLE AUTHOR REFERENCE SYNOPSIS 4.11 4.12 4.13 Pretreatment of kraft pulp Is the key to easy final bleaching Chlorinated organic matter in bleached and chemical pulp production Fossum, M., and Harkluod, Ann Earl, Paul f.. and Reeve, Douglas U. TAPPI Journal, November 1988, pp. 79-84 TAPPI Journal, January 1990, pp. 179 .

A method for integrated optimization of chlorine dioxide .

A general description of this goal is to deliver pulp with the lowest Kappa number to a bleach plant that still maintains the required pulp strength and avoids sharply dropping the pulp yield (Pikka et al. 2000). It is necessary to establish an integrated optimization model for the chlorine dioxide bleaching process to achieve this goal.

New Pulp Biobleaching System Involving Manganese .

Attempts have been made to use manganese peroxidase (MnP) for chlorine-free pulp biobleaching, but they have not been commercially viable because of the enzyme's low stability. We developed a new pulp biobleaching method involving mesoporous material-immobilized manganese peroxidase from Phanerochaete chrysosporium . MnP immobilized in FSM-16, a folded-sheet mesoporous material .

Handbook On Pulp And Paper Processing by Npcs Board Of .

The effect of alkali addition in oxygen delignification on Kappa No. of pulp and brightness is shown in Fig. 3. Kappa No. of the pulp reduced sharply with 2% alkali and then steadily upto 5% alkali. The brightness of the pulp improved moderately which is caused by delignification .

Handbook On Coal, Lignin, Wood And Rosin Processing by Dr .

For the purpose of determination by x-ray fluorescence methods, the elements introduced into cotton through chemical and additive modification (which are the major purposes for such analyses) fall into two broad categories; those of atomic number 22 and higher, and the lighter elements.

Bagasse Pulp Sheet

1 day ago · Yahya Hamzeh, Gerard Mortha, Dominique Lachenal, Soheila Izadyar, 2008, Selective Degradation of Lignin Polymer by Chlorine Dioxide During Chemical Pulp Delignification in Flow Through Reactor, Polymer Plastics Technology and Engineering, 47. AdPulp sheet size: 70 x 80 x 55 cmBrightness weig.

Oxygen delignification as a pretreatment for the enzymatic .

(1987) 30 Figure 1.21 Relationship between kappa number and pulp viscosity 31 Figure 1.22 Effect of lignin content on the ease of hydrolysis of grasses pretreated using oxygen delignification 32 Figure 3.1 The lab-scale stirred tank reactor 35 Figure 5.1 Effect of temperature and oxygen partial pressure on kappa number 48 Figure 5.2 Effect of .

Handbook on Pulp and Paper Processing

The pulp and paper industry comprises companies that use wood as raw material and produce pulp, paper, board and other cellulose based products. The pulp and paper sector presents one of the energy intensive and highly polluting sectors within the In

Photosensitized Delignification of Residual Lignin and .

Nov 05, 2002 · Summary Bleached pulps were obtained from a Eucalyptus grandis peroxyformic/formic acid chemical pulp using oxygen, hydrogen peroxide, photosensitizers (methylene blue, Fe (II) 4,4′,4″,4‴-tetrasulfophthalocyanine, hemin, hematoporphyrin) and/or TiO 2 . Residual lignin of unbleached pulp, isolated and characterized by size exclusion chromatography, 31 P NMR and thioacidolysis, was used .

Control scheme for rapid pulp delignification and .

Sep 30, 1997 · FIGS. 3a and 4a show the post oxygen stage K number--a measure of the lignin content of the pulp. In both cases the K number did not change for nearly 30 minutes, which is the typical time between consecutive measurements of K number of the pulp entering the plug flow ozonation reactor.

Correlation analysis for fiber characteristics and .

Abstract. During sequential bleaching operations, pulp fiber properties are gradually changed due to mechanical and chemical treatments. In this study, the correlations between pulp or fiber properties such as kappa number, viscosity, total charge, fiber length, and zero-span tensile strength as well as Scott bond of elemental chlorine free (ECF) bleached softwood kraft pulps was investigated.

Control scheme for rapid pulp delignification and .

Sep 30, 1997 · FIGS. 3a and 4a show the post oxygen stage K number--a measure of the lignin content of the pulp. In both cases the K number did not change for nearly 30 minutes, which is the typical time between consecutive measurements of K number of the pulp entering the plug flow ozonation reactor.

Chemistry of Chlorine Dioxide Pulp Bleaching

microorganisms by physical or chemical means When a bacterial cell comes into contact with chlorine dioxide it donates an electron from its cell wall, thereby creating a breach in the cell wall through which cell contents pass in an attempt to bring the concentrations on either side of the cell membrane to equilibrium. The cell dies through lysis.