Effect of mixing hydrodynamics on the particle and filtration properties of precipitated lignin

Kannangara, Miyuru; Marinova, Mariya; Fradette, Louis; Paris, Jean

doi:10.1016/j.cherd.2015.11.003

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…The key steps were similar to those reported by Kannangara et al [ 32 ]. For all experiments, BL that had been diluted to a total solids level of 30% and thoroughly mixed is sampled for UV lignin content analysis.…”

Section: Methodssupporting

confidence: 87%

Quantification and Variability Analysis of Lignin Optical Properties for Colour-Dependent Industrial Applications

et al. 2018

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Lignin availability has increased significantly due to the commercialization of several processes for recovery and further development of alternatives for integration into Kraft pulp mills. Also, progress in lignin characterization, understanding of its chemistry as well as processing methods have resulted in the identification of novel lignin-based products and potential derivatives, which can serve as building block chemicals. However, all these have not led to the successful commercialization of lignin-based chemicals and materials. This is because most analyses and characterizations focus only on the technical suitability and quantify only the composition, functional groups present, size and morphology. Optical properties, such as the colour, which influences the uptake by users for diverse applications, are neither taken into consideration nor analysed. This paper investigates the quantification of lignin optical properties and how they can be influenced by process operating conditions. Lignin extraction conditions were also successfully correlated to the powder colour. About 120 lignin samples were collected and the variability of their colours quantified with the CIE L*a*b* colour space. In addition, a robust and reproducible colour measurement method was developed. This work lays the foundation for identifying chromophore molecules in lignin, as a step towards correlating the colour to the functional groups and the purity.

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Section: Methodssupporting

confidence: 87%

Quantification and Variability Analysis of Lignin Optical Properties for Colour-Dependent Industrial Applications

et al. 2018

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“…Amriani et al (2015) call for "slow stirring" at 50 revolutions per minute following a treatment with PAC. Kannangara et al (2016) recommended to use low turbulent power mixing during coagulation to increase the filtration rate of precipitated lignin. , when describing the LignoForce system, specify "gentle mixing" during the coagulation treatment.…”

Section: Stirringmentioning

confidence: 99%

Lignin recovery from spent alkaline pulping liquors using acidification, membrane separation, and related processing steps: A review

Hubbe¹,

Alén²,

Paleologou³

et al. 2019

BioRes

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The separation of lignin from the black liquor generated during alkaline pulping is reviewed in this article with an emphasis on chemistry. Based on published accounts, the precipitation of lignin from spent pulping liquor by addition of acids can be understood based on dissociation equilibria of weak acid groups, which affects the solubility behavior of lignin-related chemical species. Solubility issues also govern lignin separation technologies based on ultrafiltration membranes; reduction in membrane permeability is often affected by conditions leading to decreased solubility of lignin decomposition products and the presence of colloidal matter. Advances in understanding of such phenomena have potential to enable higher-value uses of black liquor components, including biorefinery options, alternative ways to recover the chemicals used to cook pulp, and debottlenecking of kraft recovery processes.

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“…As such, particles obtained with an increasing surface area to volume are spherical particles, 95,96 sheet-like particles (obtained by freezing), 97 hollow particles, 98,99 crumpled particles, 100,101 and fractal aggregates. 102 In the supramolecular interaction of lignins with other interfaces, the functional group exposed and their configuration will be of key importance. This will completely determine the development of the interphase in nanocomposites but also the mechanical properties of the composite as associated with the adhesive properties at the hybrid interfaces.…”

Section: Technical Ligninsmentioning

confidence: 99%

Section: Lignin Fundamentalsmentioning

confidence: 99%

“… 121 Furthermore, reducing charge repulsion, for instance by addition of acids, results in a compaction proportionally improved by increasing the acidification rate. 102 Overall, decreasing self-repulsion and aggregation rate while increasing self-interaction will result in the most compact assemblies, with the potential to tune the mechanical properties of the resulting nanoparticles and the nanocomposites as well as nano-biohybrids they form. In accounting for the kinetics of self-assembly, sequential nucleation-growth mechanisms may have detrimental effects on the mechanical properties of the particles due to the formation of discontinuous network.…”

Section: Lignin Fundamentalsmentioning

confidence: 99%

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Multifunctional lignin-based nanocomposites and nanohybrids

et al. 2021

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Effect of mixing hydrodynamics on the particle and filtration properties of precipitated lignin

Cited by 14 publications

References 21 publications

Quantification and Variability Analysis of Lignin Optical Properties for Colour-Dependent Industrial Applications

Quantification and Variability Analysis of Lignin Optical Properties for Colour-Dependent Industrial Applications

Lignin recovery from spent alkaline pulping liquors using acidification, membrane separation, and related processing steps: A review

Multifunctional lignin-based nanocomposites and nanohybrids

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