Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation

In this research, two types of lignin, i.e. one extracted from industrial waste water of the Iran wood and paper (choka) factory as black liquor and another provided from Aldrich company, were studied. Firstly, the lignin was precipitated from its black liquor by a dilute acid and was then purified...

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Autores principales:	Mehdi Abdolahi, Said amir Mosavian, Akbar Varamsh, Amin Asadi
Formato:	article
Lenguaje:	FA
Publicado:	Regional Information Center for Science and Technology (RICeST) 2017
Materias:	LIGNIN Acetylation Structural characterization FTIR 1H-NMR Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/f8664760db0546e6a0857b11b3b297c7
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spelling	oai:doaj.org-article:f8664760db0546e6a0857b11b3b297c72021-12-02T11:55:26ZQualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation1735-09132383-112X10.22092/ijwpr.2017.109402.1388https://doaj.org/article/f8664760db0546e6a0857b11b3b297c72017-10-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_113508_944380991fe46b4445912a34eef84641.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XIn this research, two types of lignin, i.e. one extracted from industrial waste water of the Iran wood and paper (choka) factory as black liquor and another provided from Aldrich company, were studied. Firstly, the lignin was precipitated from its black liquor by a dilute acid and was then purified by dissolving in tetrahydrofuran (THF). Lignin samples were characterized using Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1HNMR) spectroscopies. It was found from results that the Aldrich lignin has a structure similar with the lignosulfonate while lignin extracted from black liquor does not have a hydrophilic sulfonate group and has a Kraft lignin structure. Using acetylation of Kraft lignin and complementary characterization with 1HNMR spectroscopy, the ratio of hydroxyl functional groups to methoxy groups was calculated to be 1.11 to 1, and amount of the hydroxyl groups was calculated to be 5.91 mmol/g of acetylated lignin, where 53% of the hydroxyl groups is related to the aromatic hydroxyl groups. By having the molecular weight of the Kraft lignin which was obtained from the gel permeation chromatography (GPC) analysis of the acetylated Kraft lignin to be 1260 g/mol, average number of the hydroxyl groups per acetylated lignin chain was calculated to be 7.44.Mehdi AbdolahiSaid amir MosavianAkbar VaramshAmin AsadiRegional Information Center for Science and Technology (RICeST)articleLIGNINAcetylationStructural characterizationFTIR1H-NMRForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 32, Iss 3, Pp 369-381 (2017)
institution	DOAJ
collection	DOAJ
language	FA
topic	LIGNIN Acetylation Structural characterization FTIR 1H-NMR Forestry SD1-669.5
spellingShingle	LIGNIN Acetylation Structural characterization FTIR 1H-NMR Forestry SD1-669.5 Mehdi Abdolahi Said amir Mosavian Akbar Varamsh Amin Asadi Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation
description	In this research, two types of lignin, i.e. one extracted from industrial waste water of the Iran wood and paper (choka) factory as black liquor and another provided from Aldrich company, were studied. Firstly, the lignin was precipitated from its black liquor by a dilute acid and was then purified by dissolving in tetrahydrofuran (THF). Lignin samples were characterized using Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1HNMR) spectroscopies. It was found from results that the Aldrich lignin has a structure similar with the lignosulfonate while lignin extracted from black liquor does not have a hydrophilic sulfonate group and has a Kraft lignin structure. Using acetylation of Kraft lignin and complementary characterization with 1HNMR spectroscopy, the ratio of hydroxyl functional groups to methoxy groups was calculated to be 1.11 to 1, and amount of the hydroxyl groups was calculated to be 5.91 mmol/g of acetylated lignin, where 53% of the hydroxyl groups is related to the aromatic hydroxyl groups. By having the molecular weight of the Kraft lignin which was obtained from the gel permeation chromatography (GPC) analysis of the acetylated Kraft lignin to be 1260 g/mol, average number of the hydroxyl groups per acetylated lignin chain was calculated to be 7.44.
format	article
author	Mehdi Abdolahi Said amir Mosavian Akbar Varamsh Amin Asadi
author_facet	Mehdi Abdolahi Said amir Mosavian Akbar Varamsh Amin Asadi
author_sort	Mehdi Abdolahi
title	Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation
title_short	Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation
title_full	Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation
title_fullStr	Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation
title_full_unstemmed	Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation
title_sort	qualitative structural characterization of two lignin samples and quantitative determination of hydroxyl and methoxyl functional groups in kraft lignin via acetylation
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2017
url	https://doaj.org/article/f8664760db0546e6a0857b11b3b297c7
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_version_	1718394844679766016

Qualitative Structural Characterization of Two Lignin Samples and Quantitative Determination of Hydroxyl and Methoxyl Functional Groups in Kraft Lignin via Acetylation

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