Peracids in Kraft Pulp Bleaching: Past, Present, and Future

Poppius-Levlin, Kristiina; Jääskeläinen, Anna‐Stiina; Seisto, Anu; Fuhrmann, Agneta

doi:10.1021/bk-2000-0742.ch024

Cited by 15 publications

(23 citation statements)

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“…Essas reações podem ser catalisadas por íons de metais de transição 31,36 e os radicais hidroxila formados durante a decomposição catalisada de peróxido de hidrogênio podem, igualmente, reagir com Pa 37 . Muito antes, porém, de serem empregados como reagentes de deslignificação e branqueamento de polpas celulósicas, o potencial oxidante dos perácidos já era aproveitado comercialmente na síntese de epóxidos, glicerol e resinas epóxi, como desinfetantes, fungicidas e em lavanderias 7,[11][12][13] . Um dos perácidos mais estudados é o ácido peracético (Pa) que, desde o final da década de 40, vem sendo investigado como reagente de branqueamento e deslignificação para polpas químicas [14][15][16][17][18][19][20][21] .…”

Section: Introductionunclassified

“…Um dos perácidos mais estudados é o ácido peracético (Pa) que, desde o final da década de 40, vem sendo investigado como reagente de branqueamento e deslignificação para polpas químicas [14][15][16][17][18][19][20][21] . Recentemente, foi relatado que algumas fábricas de celulose já utilizam Pa permanentemente ou durante a produção de polpas TCF 22,23 e que este perácido vem sendo produzido na Finlândia e na Suécia em escala industrial 13,24 . Em solução, os perácidos são mais voláteis e menos ácidos do que os ácidos carboxílicos correspondentes.…”

Section: Introductionunclassified

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A utilização de perácidos na deslignificação e no branqueamento de polpas celulósicas

Brasileiro¹,

Colodette²,

Piló‐Veloso³

2001

Quím. Nova

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Recebido em 18/8/00; aceito em 4/4/01 THE USE OF PERACIDS IN DELIGNIFICATION AND CELLULOSE PULP BLEACHING . Peracids are strong oxidant species and their use is being largely studied in the delignification and cellulose pulp bleaching. Some of them has already an industrial application, specially in non-conventional bleaching sequences like ECF (Elemental chlorine free) and TCF (Totally chlorine free). This review presents the main aspects of the structure, properties, preparation and reaction of peracids (peracetic acid, peroxymonosulfuric acid and their mixture) with lignin, specially for peracetic acid. Information about bleaching and delignification of wood pulps with peracids and the factors affecting its efficiency are also presented.

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Section: Introductionunclassified

A utilização de perácidos na deslignificação e no branqueamento de polpas celulósicas

Brasileiro¹,

Colodette²,

Piló‐Veloso³

2001

Quím. Nova

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“…The longer bleaching time made the H2O2 solution more reactive. The bleached reaction species of alkaline hydrogen peroxide are hydroperoxy anions HOO -.The decomposition intermediates, such as hydroxyl HO• and superoxide anion O2−• radicals, have generally undesirable influence in bleaching processes [16]. The mechanism process involves the hydrogen peroxide-oxidized non-phenolic units of lignin through the release of one electron and forms a cation radical that then decomposes chemically.…”

Section: Score On Whiteness Colormentioning

confidence: 99%

“…However, such a process requires control in the bleaching process because if hydroperoxide anion is excessive, this anion can also attack cellulose and decrease the pulp strength [15]. Poppius-Levlin et al [16] stated that the advantage of peracetic acid over oxygen-based chemicals was that peracetic acid reacted selectively with lignin and left the pulp carbohydrates practically intact. Barros et al [17] reported that peracetic acid was relatively fast when applied at the last stage of elemental chlorine free (ECF) bleaching sequences.…”

Section: Introductionmentioning

confidence: 99%

Bleaching Process on Oil Palm Empty Bunches by Pulping Using Formacell Liquid Waste

Hidayati¹,

Sugiharto²,

Hadi³

2020

Rev. Chim.

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The formacell process produces black liquor that damages the environment. Previous research has shown that black liquor can be used as a cooking solution for pulping. The pulping process using formacell waste on oil palm empty bunches produces a dark color; therefore, it requires a bleaching process. The aim of this study was to determine the effect of the type of cooking solution (fresh pulping solution and leachate residual from pulping) and bleaching time (0.5, 1, 1.5, 2, and 2.5 h) on pulp yield, cellulose content, permanganate number, and score on whiteness degree. The bleaching process used 35% peracetic acid and was conducted at 80�C. The best results were obtained at a bleaching time of 2 h, which resulted in yields of 76.1%�81.2%, cellulose contents of 53%�62.5%, permanganate numbers of 6.3�7.4, and scores of color of 3.78 (yellowish white) to 4.7 (white).

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“…A future paper will focus on perhydrolysis of esters in more detail. Perhydrolysis is an important reaction to make peroxycarboxylic acids, which are useful oxidants in organic chemistry [2] , for lignin removal [3,4] and pulp bleaching [5] and for disinfecting wastewater [6] and disinfecting equipment for food and medical applications. [7–9] …”

Section: Introductionmentioning

confidence: 99%

New Structural Motif for Carboxylic Acid Perhydrolases

Yin

Purpero

Fujii

et al. 2013

Chemistry A European J

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Some serine hydrolases also catalyze a promiscuous reaction -reversible perhydrolysis of carboxylic acids to make peroxycarboxylic acids. Five x-ray crystal structures of these carboxylic acid perhydrolases show a proline in the oxyanion loop. Here, we test whether this proline is essential for high perhydrolysis activity using Pseudomonas fluorescens esterase (PFE). The L29P variant of this esterase catalyzes perhydrolysis 43-fold faster (k cat comparison) than wild type. Surprisingly, saturation mutagenesis at the 29 position of PFE identified six other amino acid substitutions that increase perhydrolysis of acetic acid at least fourfold over wild type. The best variant, L29I PFE, catalyzed perhydrolysis 83 times faster (k cat comparison) than wild-type PFE and twice as fast as L29P PFE. Despite the different amino acid in the oxyanion loop, L29I PFE shows a similar selectivity for hydrogen peroxide over water as L29P PFE ( 0 = 170 M −1 vs. 160 M −1 ), and a similar fast formation of acetyl-enzyme (140 U/mg vs. 62 U/mg). X-ray crystal structures of L29I PFE with and without bound acetate show an unusual mixture of two different oxyanion loop conformations. The type II -turn conformation resembles the wild-type structure and is unlikely to increase perhydrolysis, but the type I -turn conformation creates a binding site for a second acetate. Modeling suggests that a previously proposed mechanism for L29P PFE can be extended to include L29I PFE where an acetate accepts a hydrogen bond to promote faster formation of the acetyl enzyme.

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Peracids in Kraft Pulp Bleaching: Past, Present, and Future

Cited by 15 publications

References 0 publications

A utilização de perácidos na deslignificação e no branqueamento de polpas celulósicas

A utilização de perácidos na deslignificação e no branqueamento de polpas celulósicas

Bleaching Process on Oil Palm Empty Bunches by Pulping Using Formacell Liquid Waste

New Structural Motif for Carboxylic Acid Perhydrolases

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