Pulp bleaching by hydrogen peroxide activated with copper 2,2′-dipyridylamine and 4-aminopyridine complexes

Rahmawati, Noor; Ohashi, Yayoi; Honda, Yoshio; Kuwahara, Masaaki; Fackler, Karin; Messner, Kurt; Watanabe, Takashi

doi:10.1016/j.cej.2005.07.006

Cited by 29 publications

(20 citation statements)

References 11 publications

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“…For example, pulping black liquors contain high amounts of phenolic compounds, which have a powerful toxic effect on microorganisms even at low concentrations (Mishra et al 1995;Fortuny et al 1998); and the pulps bleached with chlorinated chemicals (chlorine and chlorine dioxide) produce chlorolignins highly resistant to biodegradation, as well as other polluting compounds that could be acutely toxic, mutagenic and carcinogenic (Rahmawati et al 2005). Although the chlorine and its derivatives are effective and cheap bleaching agents (Bianchi et al 1999), environmental concerns have created a need for new technologies using other non-polluting bleaching sequences for pulp, based on the use of elemental chlorine-free or totally chlorine-free procedures (Rahmawati et al 2005;Tanaka et al 2004;Tutus 2004).…”

Section: Introductionmentioning

confidence: 97%

“…This anion is a strong nucleophile which, during bleaching, converts electron-rich chromophores typified by unsaturated aldehydes and ketones, and phenolic ring-conjugated ethylenic or carbonyl groups to their non-chromophoric counterparts. The reactions of lignin with peroxide are not reversible and lead to the permanent removal of most of the chromophoric groups present in the lignin molecule (Rahmawati et al 2005;Tutus 2004). …”

Section: Introductionmentioning

confidence: 99%

“…Among these chemicals, hydrogen peroxide is recognized as an environmentally friendly and strong oxidizing agent, being considered as one of the most important bleaching chemicals. In alkaline media, the equilibrium of H 2 O 2 shifts to the formation of hydroperoxide anion (-OOH) that is the principal active species in peroxide bleaching (Rahmawati et al 2005;Brooks and Moore 2000). This anion is a strong nucleophile which, during bleaching, converts electron-rich chromophores typified by unsaturated aldehydes and ketones, and phenolic ring-conjugated ethylenic or carbonyl groups to their non-chromophoric counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain

2008

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Brewer's spent grain (BSG) was evaluated for bleached pulp production. Two cellulose pulps with different chemical compositions were produced by soda pulping: one from the original raw material and the other from material pretreated by dilute acid. Both of them were bleached by a totally chlorine-free sequence performed in three stages, using 5% hydrogen peroxide in the two initial, and a 0.25 N NaOH solution in the last one. Chemical composition, kappa number, viscosity, brightness and yield of bleached and unbleached pulps were evaluated. The high hemicellulose (28.4% w/w) and extractives (5.8% w/w) contents in original BSG affected the pulping and bleaching processes. However, soda pulping of acid pretreated BSG gave a celluloserich pulp (90.4% w/w) with low hemicellulose and extractives contents (7.9% w/w and \3.4% w/w, respectively), which was easily bleached achieving a kappa number of 11.21, viscosity of 3.12 cp, brightness of 71.3%, cellulose content of 95.7% w/w, and residual lignin of 3.4% w/w. Alkaline and oxidative delignification of acid pretreated BSG was found as an attractive approach for producing high-purity, chlorine-free cellulose pulp.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain

2008

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“…The elemental chlorine free (ECF) and the total chlorine free (TCF) bleaching sequences are based on oxygen-derived compounds, among which hydrogen peroxide has received much attention. Although hydrogen peroxide is attractive, for environmental reasons, its use results in pulps with higher ash contents than pulps bleached by the conventional chlorine-based method [7,16]. Peroxide bleaching may either be carried out as a single-stage process, or may be preceded by a pretreatment to eliminate peroxide decomposition catalysts.…”

Section: Introductionmentioning

confidence: 99%

Dissolving pulp from corn stalk residue and waste water of Merox unit

Behin¹,

Zeyghami²

2009

Chemical Engineering Journal

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“…The strategies used by these organisms include the release of reactive oxygen species produced by redox-active metals and metalloenzymes [27] as well as the excretion of species-dependent combinations of lignin-modifying oxidoreductases [28][29][30][31], monooxygenases [32], and glycan-acting hydrolases, esterases, and lyases. Several abiotic catalytic oxidative treatments that mimic certain features of these successful biological approaches have recently been investigated as technologies for pulp bleaching or delignification [33,34] and the pretreatment of cellulosic biomass for the production of biofuels [35,36]. Leskelä and co-workers developed a pressurized O 2 -dependent strategy catalyzed by copper-diimine complexes that is effective in both pretreatment processes and pulp bleaching [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Rapid and Effective Oxidative Pretreatment of Woody Biomass at Mild Reaction Conditions and Low Oxidant Loadings

Li¹,

Chen²,

Hegg³

et al. 2015

New Microbial Technologies for Advanced Biofuels

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Background: One route for producing cellulosic biofuels is by the fermentation of lignocellulose-derived sugars generated from a pretreatment that can be effectively coupled with an enzymatic hydrolysis of the plant cell wall. While woody biomass exhibits a number of positive agronomic and logistical attributes, these feedstocks are significantly more recalcitrant to chemical pretreatments than herbaceous feedstocks, requiring higher chemical and energy inputs to achieve high sugar yields from enzymatic hydrolysis. We previously discovered that alkaline hydrogen peroxide (AHP) pretreatment catalyzed by copper(II) 2,2΄-bipyridine complexes significantly improves subsequent enzymatic glucose and xylose release from hybrid poplar heartwood and sapwood relative to uncatalyzed AHP pretreatment at modest reaction conditions (room temperature and atmospheric pressure). In the present work, the reaction conditions for this catalyzed AHP pretreatment were investigated in more detail with the aim of better characterizing the relationship between pretreatment conditions and subsequent enzymatic sugar release. Results: We found that for a wide range of pretreatment conditions, the catalyzed pretreatment resulted in significantly higher glucose and xylose enzymatic hydrolysis yields (as high as 80% for both glucose and xylose) relative to uncatalyzed pretreatment (up to 40% for glucose and 50% for xylose). We identified that the extent of improvement in glucan and xylan yield using this catalyzed pretreatment approach was a function of pretreatment conditions that included H 2 O 2 loading on biomass, catalyst concentration, solids concentration, and pretreatment duration. Based on these results, several important improvements in pretreatment and hydrolysis conditions were identified that may have a positive economic impact for a process employing a catalyzed oxidative pretreatment. These improvements include identifying that: (1) substantially lower H 2 O 2 loadings can be used that may result in up to a 50-65% decrease in H 2 O 2 application (from 100 mg H 2 O 2 /g biomass to 35-50 mg/g) with only minor losses in glucose and xylose yield, (2) a 60% decrease in the catalyst concentration from 5.0 mM to 2.0 mM (corresponding to a catalyst loading of 25 μmol/g biomass to 10 μmol/g biomass) can be achieved without a subsequent loss in glucose yield, (3) an order of magnitude improvement in the time required for pretreatment (minutes versus hours or days) can be realized using the catalyzed pretreatment approach, and (4) enzyme dosage can be reduced to less than 30 mg protein/g glucan and potentially further with only minor losses in glucose and xylose yields. In addition, we established that the reaction rate is improved in both catalyzed and uncatalyzed AHP pretreatment by increased solids concentrations.

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Pulp bleaching by hydrogen peroxide activated with copper 2,2′-dipyridylamine and 4-aminopyridine complexes

Cited by 29 publications

References 11 publications

Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain

Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain

Dissolving pulp from corn stalk residue and waste water of Merox unit

Rapid and Effective Oxidative Pretreatment of Woody Biomass at Mild Reaction Conditions and Low Oxidant Loadings

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