Characterisation of the wet oxidation of black liquor for its integration in Kraft paper mills

Pola, Lucía; Collado, Sergio; Oulego, Paula; Calvo, P.A.; Dı́az, Mario

doi:10.1016/j.cej.2020.126610

Cited by 31 publications

(10 citation statements)

References 38 publications

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“…AS-L consisted of monomers, dimers, and small amounts of oligomers . LOA was represented by formic, acetic, lactic, glycolic, and oxalic acids (Figure S1), the major portions of which were derived from the carbohydrates and lignin (interaromatic linkages and aromatic rings). − …”

Section: Results and Discussionmentioning

confidence: 99%

Analysis of Primary Reactions in Biomass Oxidation with O₂ in Hot-Compressed Alkaline Water

et al. 2021

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The present study investigated oxidation of pulverized Japanese cedar with O 2 in hot-compressed alkaline water, employing a newly developed flow-through fixed-bed reactor (percolator). It allowed us to determine the rate of the primary extraction that was free from the secondary reactions of extract in the aqueous phase and those over the residual solid, solubility of extractable matter, and mass transport processes. Quantitative kinetic analysis revealed that the cedar consisted of three kinetic components (C1−C3) that underwent extraction in parallel following first-order kinetics with different rate constants. Further analysis revealed the chemical compositions of the kinetic components, which were mixtures of carbohydrates and lignin. C1 was converted most rapidly by nonoxidative reactions such as alkalicatalyzed hydrolysis, while C2 was converted by oxidative degradation. The product distributions from C1 and C2 (CO 2 , lower organic acids, oligosaccharides, acid-soluble, and acid-insoluble lignins) were steady throughout their conversion. Both C1 and C2 thus behaved as single reactants; nevertheless, those were lignin/carbohydrates mixtures. It was also demonstrated that the extraction rate of C2 was proportional to the concentration of dissolved O 2 . C3 was the most refractory component, consisting mainly of glucan and very minimally of the lignin, xylan, mannan, galactan, and arabinan.

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Section: Results and Discussionmentioning

confidence: 99%

Analysis of Primary Reactions in Biomass Oxidation with O₂ in Hot-Compressed Alkaline Water

et al. 2021

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“…), and TMP 2 and 6 bar for 0, 5, 15, 25, and 35 minutes. Analysis was performed on total solids (Gravimetric), acetic acid (Titration), total sugars (Phenol Sulphate), and gallic acid as total polyphenol (Denise-Folin) [24]. Sample at optimum condition was determined for inhibition and identified for acetic acid and gallic acid using LC-MS.…”

Section: Procedures 1) Experimental Designmentioning

confidence: 99%

“…5b. Total sugars are overall sugars and their derivates contained in biomass and analyzed according to the Phenol Sulphate method [24]. Kombucha culture uses sucrose as a carbon source in its metabolism.…”

Section: B Influence Of Microfiltration Process On Beetroot Biomass 1...mentioning

confidence: 99%

Potential Use of Cross-flow Microfiltration System in Separation of Functional Compound from Fermented Beetroot (Beta vulgaris L.) as Natural Oxidation Prevention

Susilowati¹,

Aspiyanto²,

Maryati³

et al. 2022

Int. J. Adv. Sci. Eng. Inf. Technol.

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This study was conducted to determine the potential utilization of microfiltration (MF) membrane in separating functional compounds from beetroot (Beta vulgaris L.) biomass as a functional drink for natural oxidation prevention. Separation was performed through MF membrane (pore size of 0.15 µm) at room temperature, flow rate ~7.5 L/min, and TMP 2 and 6 bar for 0, 5, 15, 25, and 35 minutes. The results showed that process optimization based on gallic acid as total polyphenols and acetic acid were achieved at TMP 2 and 6 bar for 35 minutes, respectively. At TMP 2 and 6 bar produced retentate with acetic acids 1.24 and 0.95%, gallic acid 0.42 and 0.41%, total solids 3.49 and 3.47%, total sugars 36.64 and 44.66 mg/mL, pH 3.11 and 3.10, and inhibiting ability of 62.45 and 58.48%, respectively, meanwhile permeate had acetic acid 0.73 and 0.82%, gallic acid 0.31 and 0.33%, total solids 3.39 and 3.38%, total sugars 40.95 and 61.56 mg/mL, pH 3.12 and 3.13, inhibiting ability of 47.62 and 52.43%, respectively. In these conditions, CF-MF is technically able to retain acetic acid (2.63-folds) and gallic acid (1.21-folds) in the retentate and increase inhibition by 25.12 and 11.25% in comparison with the initial process (0 minutes). The LC-MS analysis of permeate at TMP 2 and 6 bar for 35 minutes were predominated by monomers of acetic acid and gallic acid with MW 61.2450 Da. (M+) and 193.0327 Da. (M+Na+) and relative intensities 100 %.

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“…However, in these early studies, the quantifications of vanillin and lignin were ambiguous. More recently, wet oxidation of black liquor was proposed as a pretreatment for the pulp industry that would reduce viscosity, organic sulfur, and pH . The authors also observed an increase in CO 2 and acetic and lactic acids production with oxidation and suggested that carboxylic acids could be recovered and valorized before total oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, wet oxidation of black liquor was proposed as a pretreatment for the pulp industry that would reduce viscosity, organic sulfur, and pH. 26 The authors also observed an increase in CO 2 and acetic and lactic acids production with oxidation and suggested that carboxylic acids could be recovered and valorized before total oxidation. In the last decades, Pinto et al reported the oxidation of various pulping liquors in alkaline conditions without catalyst.…”

Section: ■ Introductionmentioning

confidence: 99%

Production of Phenolic Compounds from Catalytic Oxidation of Kraft Black Liquor in a Continuous Reactor

Mañas

Chaussard

Bertaud

et al. 2022

Ind. Eng. Chem. Res.

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Black liquor is a side stream from pulp and paper industry containing lignin and other organic and inorganic materials. Catalytic alkaline oxidation of black liquor was carried out employing CuO/TiO2 catalyst in a trickle bed reactor employing mild reaction conditions (150-200°C, 80 bar) and short contact times (4-9 minutes). The effects of temperature, contact time, and presence of catalyst were investigated. In our best operating conditions, i.e. 200°C, 4 min contact time, lignin conversion was complete and phenolic monomers were obtained (maximum total yield 6.2 wt.%), among which vanillin (maximum yield 3.3 wt.%). Vanillin represented 53 wt.% of phenolic monomers. At longer contact times, the degradation of phenolic compounds was observed. The application of a continuous trickle bed reactor, allowing short reaction times and limiting degradation reactions, is particularly appropriate for this reaction. Vanillin productivity in this reactor is 936 g.m 3 .h -1 .

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Characterisation of the wet oxidation of black liquor for its integration in Kraft paper mills

Cited by 31 publications

References 38 publications

Analysis of Primary Reactions in Biomass Oxidation with O₂ in Hot-Compressed Alkaline Water

Analysis of Primary Reactions in Biomass Oxidation with O₂ in Hot-Compressed Alkaline Water

Potential Use of Cross-flow Microfiltration System in Separation of Functional Compound from Fermented Beetroot (Beta vulgaris L.) as Natural Oxidation Prevention

Production of Phenolic Compounds from Catalytic Oxidation of Kraft Black Liquor in a Continuous Reactor

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Characterisation of the wet oxidation of black liquor for its integration in Kraft paper mills

Cited by 31 publications

References 38 publications

Analysis of Primary Reactions in Biomass Oxidation with O2 in Hot-Compressed Alkaline Water

Analysis of Primary Reactions in Biomass Oxidation with O2 in Hot-Compressed Alkaline Water

Potential Use of Cross-flow Microfiltration System in Separation of Functional Compound from Fermented Beetroot (Beta vulgaris L.) as Natural Oxidation Prevention

Production of Phenolic Compounds from Catalytic Oxidation of Kraft Black Liquor in a Continuous Reactor

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Product

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Analysis of Primary Reactions in Biomass Oxidation with O₂ in Hot-Compressed Alkaline Water

Analysis of Primary Reactions in Biomass Oxidation with O₂ in Hot-Compressed Alkaline Water