Lignin/Tannin‐Abtrennung aus Lignocellulosen

Unkelbach, Gerd; Pindel, Elvira; Schweppe, Rainer

doi:10.1002/cite.200900074

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…Solche zweiphasigen Ganzzell-Biotransformationen wurden hinsichtlich ihres ökonomischen Potenzials positiv evaluiert (Kuhn et al 2010;Mathys 1997). Die biokatalytische Epoxidierung von Styrol zu enantiomerenreinem (S)-Styroloxid stellt ein gut untersuchtes Beispiel für einen solchen Prozess dar (Kuhn et al 2010;Panke et al 2002;Park et al 2006 (Brandenbusch et al 2010;Kollmer 1997;Mathys 1997;van Sonsbeek et al 1993).…”

Section: Biokatalytische Epoxidierung Von Styrol Zu Enantiomerenreineunclassified

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Mikrobielle Prozesse

Syldatk

Chmiel²,

Brandenbusch

et al. 2011

Bioprozesstechnik

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Section: Biokatalytische Epoxidierung Von Styrol Zu Enantiomerenreineunclassified

“…So weisen beispielsweise Unkelbach et al (2009) Hier setzt dann der Biotechnologe an. Die Umwandlung der oben genannten oder anderer pflanzlicher Bestandteile mittels Enzymen kann bei Jaeger et al (2006) und Olsen und Schäfer (2006 nachgelesen werden.…”

Section: Bioethanolproduktionunclassified

Mikrobielle Prozesse

Syldatk

Chmiel²,

Brandenbusch

et al. 2011

Bioprozesstechnik

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“…Only a minor part of this bark is presently used on a small scale e.g., in horticulture as mulch. The valorization of tree bark has the potential to more efficiently use resources, with both ecological and financial benefits [12,13]. Bark differs from wood by its high content of extractives as well as its high amount of inorganic material [14].…”

Section: Introductionmentioning

confidence: 99%

“…In studies conducted previously on the topic of extracting lignin from tree bark using the organosolv process, Liu et al [11] proved that valuable crude lignin can be obtained from pine and oak bark. Unkelbach et al [13] performed a single-stage ethanol extraction of lignin on spruce bark. Due to its high concentration of non-lignin extractables, the obtained lignin is impure.…”

Section: Introductionmentioning

confidence: 99%

Organosolv Lignin from European Tree Bark: Influence of Bark Pretreatment

et al. 2021

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As lignin is becoming more and more attractive to industry and the circular economy continues to grow, the utilization of a byproduct that, to date, has been underrated by the wood industry is investigated as an abundantly available source of lignin. Bark from spruce, larch and beech tress is extracted using the organosolv process with and without prior hot water extraction. The influence of the treatment on chemical properties of the lignin was determined by spectrophotometric, chromatographic, and vibrational spectroscopy. It was found that hot water extraction prior to organosolv extraction influences the chemical composition, antioxidative properties and molecular weight distribution of the obtained extracts. While hot water extracts are rich in flavonoids, organosolv fractions can contain high amounts of organic acids depending on whether they are from a hardwood or softwood source. This investigation lays the foundation for further research into the utilization of byproducts to generate high-value resources.

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“…Also, the Kraft process is harsh to the lignin structure itself and causes a certain cleavage structure. The organosolv process is more gentle toward the molecule structure, but it is more expensive and not commercially established like the Kraft process (Schulze, Seidel-Morgenstern, Lorenz, Leschinsky, & Unkelbach, 2016;Unkelbach, Pindel, & Schweppe, 2009). By using bark, these isolation processes will be omitted, because it gets parted of the trunks directly on-site of the pulp and paper industry.…”

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confidence: 99%

Lignin from bark as a resource for aromatics production by hydrothermal liquefaction

et al. 2018

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Biorefineries, which are using mostly unused side streams of other existing processes like bark or lignin, have a huge potential to open new resources, for example, chemicals. But with new resources new challenges will be met along the way. These challenges must be addressed and discussed to build a solid and far‐sighted process. This work focuses on the formation of monocyclic compounds like catechol as a valuable product during the hydrothermal liquefaction of beech wood bark as well as Kraft lignin from pine wood like Indulin AT. The focus is to get a better knowledge of the behavior of bark during hydrothermal liquefaction for depolymerization aiming at the production of aromatic building blocks for chemicals. Therefore, the influence, for example, of temperature and reaction time, the chemical reaction pathways, and the therefore necessary analytics need to be understood. Several limitations and challenges of common analytical methods are discussed and compared for bark and Kraft lignin, which is relatively well investigated and can act as a reference material to build a common ground and make it possible to build standards for all bioeconomic processes. Hydrothermal conditions increase the yield and selectivity toward bifunctional molecules like catechol. With rising temperatures and longer retention times, the catechol mass yields get lower. At temperatures above 350°C, nearly no catechol could be found any more. Different types of wood deliver different lignin compositions in terms of the monomeric units. However, it can be observed that different lignins show the same trends in regard to the catechol yield concerning temperatures and reaction time dependence, but overall a different product spectrum.

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Lignin/Tannin‐Abtrennung aus Lignocellulosen

Cited by 5 publications

References 3 publications

Mikrobielle Prozesse

Mikrobielle Prozesse

Organosolv Lignin from European Tree Bark: Influence of Bark Pretreatment

Lignin from bark as a resource for aromatics production by hydrothermal liquefaction

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