Catalysis and Activation of Oxygen and Peroxide Delignification of Chemical Pulps: A Review

Suchy, Miro; Argyropoulos, Dimitris S.

doi:10.1021/bk-2001-0785.ch001

Cited by 60 publications

(44 citation statements)

References 13 publications

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“…When H 2 O 2 is added in NaOH treatment, oxidative delignification is enhanced due to cleavage of CAC bond. 18,20 Lignin removal in LL hybrid poplar was much lower than HL hybrid poplar in NaOH treatment regardless of H 2 O 2 addition. As shown by the data in Table 5, the digestibility of HL and LL hybrid poplar improved significantly by addition of H 2 O 2 .…”

Section: Effect Of H 2 O 2 Addition In the Naoh Treatment Of Hybrid Pmentioning

confidence: 92%

Pretreatment of corn stover and hybrid poplar by sodium hydroxide and hydrogen peroxide

Gupta

Lee

2010

Biotechnology Progress

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Sodium hydroxide and its derivatives are used as pulping reagents, wherein the spent NaOH is recovered in salt form and reused. In this study, use of low concentration NaOH (1-5%) in pretreatment of corn stover and hybrid poplar was investigated. It was done with the understanding that NaOH can be recovered. One of the main objectives in this study is to explore the potential of H(2)O(2) with NaOH for pretreatment of high lignin substrate such as hybrid poplar. Pretreatment time has not been optimized in this study but held constant at 24 h. Corn stover, after treatment with NaOH under moderate conditions, attains near quantitative glucan digestibility. On the other hand, hybrid poplar requires treatment at higher temperature and NaOH concentration to attain acceptable level of digestibility. Supplementation of hydrogen peroxide in the pretreatment significantly raises delignification and digestibility of hybrid poplar. It was also helpful in retaining the carbohydrates in the treated solids. Retention of hemicellulose after pretreatment provides a significant economic benefit as it eliminates the need for detoxifying hemicellulose sugars. As the residual xylan remaining after pretreatment is an impediment to enzymatic digestion of glucan, supplementation of xylanase has significantly increased the digestibility of glucan as well as xylan of the treated hybrid poplar.

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Section: Effect Of H 2 O 2 Addition In the Naoh Treatment Of Hybrid Pmentioning

confidence: 92%

Pretreatment of corn stover and hybrid poplar by sodium hydroxide and hydrogen peroxide

Gupta

Lee

2010

Biotechnology Progress

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“…This is because the addition of more than 1% H 2 O 2 , without introducing other additives, will cause serious cellulose degradation due to more hydroxyl radicals (OH) being generated. Although the unstable hydroxyl radicals are responsible for delignification, they also attack the cellulose chains, resulting in strength loss of the fibres (Sjöström 1993;Potùcek et al 2000;Suchy and Agryropoulos 2002;Knill and Kennedy 2003;Ng et al 2011). However, in this study, the addition of 1.4% H 2 O 2 had yet to stimulate the degradation of cellulose to a large extent.…”

Section: Comparison Between Oxygen Delignification and H 2 O 2 Reinfomentioning

confidence: 99%

Effect of Hydrogen Peroxide and Anthraquinone on the Selectivity and Hexenuronic Acid Content of Mixed Tropical Hardwood Kraft Pulp during Oxygen Delignification

2013

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In this study, the bleachability of commercial mixed tropical hardwood brown kraft pulp by oxygen delignification (O stage) was examined. It was found that the effective reduction of kappa number was limited to about 35%, and the pulp viscosity was 20.3 cP with a selectivity less than 0.60 and ISO brightness of ca. 43%. The selectivity and pulp brightness of the O stage were improved by adding H 2 O 2 (O P stage) because it decreased the kappa number to a greater extent. However, the addition of hydrogen peroxide caused more serious cellulose degradation. In order to minimize the drop of pulp viscosity during the O P stage, a small amount (0.04%) of anthraquinone (AQ) was added. The results showed that the AQ-aided O P stage was capable of preventing cellulose degradation and thus improved the bleaching selectivity about 60%, in comparison to the ordinary O stage. Moreover, the AQ-O P pulps retained significantly less hexenuronic acid than the pulps from O and O P stages.

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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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Catalysis and Activation of Oxygen and Peroxide Delignification of Chemical Pulps: A Review

Cited by 60 publications

References 13 publications

Pretreatment of corn stover and hybrid poplar by sodium hydroxide and hydrogen peroxide

Pretreatment of corn stover and hybrid poplar by sodium hydroxide and hydrogen peroxide

Effect of Hydrogen Peroxide and Anthraquinone on the Selectivity and Hexenuronic Acid Content of Mixed Tropical Hardwood Kraft Pulp during Oxygen Delignification

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

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