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Insights into Kraft Lignins.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Insights into Kraft Lignins./
作者:	Jardim, Juliana Marangon.
面頁冊數:	1 online resource (201 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-03, Section: B.
Contained By:	Dissertations Abstracts International84-03B.
標題:	Acidification. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29289762click for full text (PQDT)
ISBN:	9798845461568

Insights into Kraft Lignins.
Jardim, Juliana Marangon.

Insights into Kraft Lignins. - 1 online resource (201 pages)

Source: Dissertations Abstracts International, Volume: 84-03, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2022.

Includes bibliographical references

Technical lignins, i.e., lignins isolated from biomass during chemical and mechanical processing, have attracted great attention in the past few decades. The biorefinery concept is an important driving force for such interest, where diverse products can be obtained from renewable materials. Kraft lignin (KL), a type of technical lignin, is relatively cheap and largely available; thus, it should be investigated as a feedstock for green materials. It is noteworthy that there are challenges to KL utilization due to its complex chemical structure, heterogeneity, lignin-carbohydrate complexes (LCCs), and modification upon processing and isolation. The present work reviews these challenges and provides a thorough elucidation of lignin precipitation, composition, and properties of very distinct kraft lignins obtained from pine, acacia, sweetgum, and eucalyptus black liquors from different stages of cooking during a time frame to produce bleachable-grade pulp. Detailed characterization and understanding of the chemical structure and composition of any technical lignin is crucial to efficient valorization strategies. Thus, this effort used a variety of wet chemistries, chromatography, and spectroscopy techniques to disclose the impact of kraft pulping and wood species upon kraft lignins. Lignin recovery performance and lignin properties varied greatly amongst the species. Specifically, different levels of contamination with carbohydrates; different LCC contents; wide range of molecular weight and functional groups were observed. Finally, the present work provides a better understanding of the differences between hardwood kraft lignins (HWKL) and softwood kraft lignins (SWKL), as well amongst HWKL with very distinct syringyl-to-guaiacyl (S/G) ratios, parameters of fundamental importance for future applications, and hence could greatly amplify the utilization of underutilized lignins.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798845461568Subjects--Topical Terms:

3561854
Acidification.
Index Terms--Genre/Form:

542853
Electronic books.

Insights into Kraft Lignins.
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100 1 $a Jardim, Juliana Marangon. $3 3704100
245 1 0 $a Insights into Kraft Lignins.
264 0 $c 2022
300 $a 1 online resource (201 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertations Abstracts International, Volume: 84-03, Section: B.
500 $a Advisor: Lucia, Lucian;Hart, Peter W. ;Jameel, Hasan.
502 $a Thesis (Ph.D.)--North Carolina State University, 2022.
504 $a Includes bibliographical references
520 $a Technical lignins, i.e., lignins isolated from biomass during chemical and mechanical processing, have attracted great attention in the past few decades. The biorefinery concept is an important driving force for such interest, where diverse products can be obtained from renewable materials. Kraft lignin (KL), a type of technical lignin, is relatively cheap and largely available; thus, it should be investigated as a feedstock for green materials. It is noteworthy that there are challenges to KL utilization due to its complex chemical structure, heterogeneity, lignin-carbohydrate complexes (LCCs), and modification upon processing and isolation. The present work reviews these challenges and provides a thorough elucidation of lignin precipitation, composition, and properties of very distinct kraft lignins obtained from pine, acacia, sweetgum, and eucalyptus black liquors from different stages of cooking during a time frame to produce bleachable-grade pulp. Detailed characterization and understanding of the chemical structure and composition of any technical lignin is crucial to efficient valorization strategies. Thus, this effort used a variety of wet chemistries, chromatography, and spectroscopy techniques to disclose the impact of kraft pulping and wood species upon kraft lignins. Lignin recovery performance and lignin properties varied greatly amongst the species. Specifically, different levels of contamination with carbohydrates; different LCC contents; wide range of molecular weight and functional groups were observed. Finally, the present work provides a better understanding of the differences between hardwood kraft lignins (HWKL) and softwood kraft lignins (SWKL), as well amongst HWKL with very distinct syringyl-to-guaiacyl (S/G) ratios, parameters of fundamental importance for future applications, and hence could greatly amplify the utilization of underutilized lignins.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Acidification. $3 3561854
650 4 $a Carbon fibers. $3 685794
650 4 $a Lignin. $3 1097216
650 4 $a Sodium. $3 3562677
650 4 $a Carbohydrates. $3 522687
650 4 $a Polymerization. $3 560492
650 4 $a Carbon dioxide. $3 587886
650 4 $a Alcohol. $3 872287
650 4 $a Molecular weight. $3 3683783
650 4 $a Chemicals. $3 1637953
650 4 $a Biomass. $3 1013462
650 4 $a Polymer blends. $3 3693668
650 4 $a Bioengineering. $3 657580
650 4 $a Chemical engineering. $3 560457
655 7 $a Electronic books. $2 lcsh $3 542853
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690 $a 0542
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a North Carolina State University. $3 1018772
773 0 $t Dissertations Abstracts International $g 84-03B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29289762 $z click for full text (PQDT)