Bleaching of High-Yield Lignocellulosic Pulps with Peroxygen Reagents

Pan, George X.; Thomson, Cameron I.; Leary, Gordon

doi:10.1021/bk-2001-0785.ch009

Cited by 5 publications

(7 citation statements)

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“…While the fundamental causes are unclear, this poor bleaching response may be because wheat straw pulps contain a greater amount of peroxide-resistant chromophores. Our earlier study has demonstrated that the bleaching response to peracid/ peroxide sequences is more pronounced for wheat straw pulps than for wood pulps (Pan et al 2001). This indirect evidence indicates that certain peroxide-resistant chromophores present in wheat straw may be attacked by more powerful oxidants, such as peracids.…”

Section: Introductionmentioning

confidence: 91%

“…Our early investigation has shown that at equivalent charges, peroxide provides a greater magnitude of brightness gain than peracids (Pan et al 2001). Especially for wood pulp, strong oxidants such as DMD create substantial amounts of chromophores thus offsetting chromophore-removing reactions.…”

Section: Pulp Preparation and Bleaching Experimentsmentioning

confidence: 99%

“…We sought explanations of our previous observation that PMS and DMD are beneficial to wheat straw bleaching, but not to wood (Pan et al 2001). In this study, the reaction substrates were selected to assess the effect on the reactivity of ferulic acid of 4-O-etherification, esterification and dimerization.…”

Section: Reactivity and Removal Of Ferulic Acid And Derivativesmentioning

confidence: 99%

“…However, this bleaching chemical offers a far lower brightness ceiling for wheat straw pulps than for wood pulps (Pan et al 2001). While the fundamental causes are unclear, this poor bleaching response may be because wheat straw pulps contain a greater amount of peroxide-resistant chromophores.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Ferulic Acid Removal during Bleaching of Wheat Straw Mechanical Pulp with Peroxygen Reagents

Pan¹,

Thomson²,

Leary³

2003

Holzforschung

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The present paper reports our investigation into the use of two peroxygen reagents, peroxymonosulfate (PMS) and dimethyldioxirane (DMD), in bleaching sequences with peroxide to bleach wheat straw mechanical pulp, their reactivity with ferulic acid model compounds, and the likely relation between the two aspects. It was observed that combinations of PMS or DMD with peroxide offered a synergy leading to substantially improved brightness development in bleaching of wheat straw pulp. At the same time, these oxidizing reagents, especially DMD, were shown to be highly reactive with ferulic acid derivatives and increased the removal of ferulic acid from wheat straw pulp in bleaching. The results would suggest that the presence of non-lignin, peroxide-resistant chromophoric components, such as ferulic acid derivatives, might be an important factor limiting the brightness development of wheat straw mechanical pulp by conventional peroxide bleaching. KeywordsWheat straw Mechanical pulp Bleaching Peroxide Peroxymonosulfate (PMS) Dimethyldioxirane (DMD) Ferulic acid Chromophore Brought to you by |

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Section: Introductionmentioning

confidence: 91%

Section: Pulp Preparation and Bleaching Experimentsmentioning

confidence: 99%

Section: Reactivity and Removal Of Ferulic Acid And Derivativesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Role of Ferulic Acid Removal during Bleaching of Wheat Straw Mechanical Pulp with Peroxygen Reagents

Pan¹,

Thomson²,

Leary³

2003

Holzforschung

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“…The two main advantages of using Oxone as an alternative to hydrogen peroxide were the increase in bleaching efficiency and the decrease in pulp yield loss. Hydrogen peroxide alone has been found to be relatively ineffective for kraft pulp bleaching [17]. Hydrogen peroxide as an oxidizing agent helped to remove residual lignin, prevented pulp from alkaline-darkening, and also enhanced pulp brightness [18].…”

Section: B) Temperatures Above 65mentioning

confidence: 99%

Total Chlorine-Free Bleaching ofPopulus deltoidesKraft Pulp by Oxone

Miri

Ghasemian

2015

International Journal of Carbohydrate Chemistry

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Since the bleaching process is one of the most important environmental pollutant stages in the pulp and paper industry, here, the total chlorine-free (TCF) bleaching of poplar kraft pulp by applying Oxone and peroxide under alkaline conditions has been investigated. The pulp samples were bleached in two stages of Oxone (O X ) treatment using an AO X1 O X2 sequence (A: acid pretreatment), and then the treated pulps were bleached by peroxide (P) to achieve target brightness (about 80%). The influence of various reaction parameters such as alkali charge, temperature, reaction time, and bleaching agent dosage was optimized. The final achieved brightness was more than 78%. Accelerated aging experiments showed more stability in brightness for the Oxone treated pulp, because alkali Oxone bleaching stops thermal degradation. Similarly, the AO X1 O X2 P bleaching sequence was found to be effective in regaining some strength that had been lost during acidification of the pulp. Improvement in pulp strength made with acid treatment was achieved along with significant amount of lignin removal and it demonstrates the feasibility of Oxone in TCF bleaching. Furthermore, other results indicated the feasibility of Oxone bleaching as an environmentally favorable alternative TCF bleaching sequence, compared with elemental chlorine-free bleaching approaches and also other TCF bleaching sequences.

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