Hydrolytic depolymerization of hydrolysis lignin: Effects of catalysts and solvents

Nubla Mahmood; Zhongshun Yuan; John Schmidt; Chunbao Charles Xu

doi:10.1016/j.biortech.2015.04.074

Hydrolytic depolymerization of hydrolysis lignin: Effects of catalysts and solvents

Nubla Mahmood
, Zhongshun Yuan
, John Schmidt
, Chunbao Charles Xu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

115 Citations (Scopus)

Abstract

Hydrolytic depolymerization of hydrolysis lignin (HL) in water and water-ethanol co-solvent was investigated at 250°C for 1h with 20% (w/v) HL substrate concentration with or without catalyst (H₂SO₄ or NaOH). The obtained depolymerized HLs (DHLs) were characterized with GPC-UV, FTIR, GC-MS, ¹H NMR and elemental analyzer. In view of the utilization of depolymerized HL (DHL) for the preparation of rigid polyurethane foams/resins un-catalyzed depolymerization of HL employing water-ethanol mixture appeared to be a viable route with high yield of DHL ~70.5wt.% (SR yield of ~9.8wt.%) and with M_w as low as ~1000g/mole with suitable aliphatic (227.1mgKOH/g) and phenolic (215mgKOH/g) hydroxyl numbers. The overall % carbon recovery under the selected best route was ~87%. Acid catalyzed depolymerization of HL in water and water-ethanol mixture lead to slightly increased M_w. Alkaline hydrolysis helped in reducing M_w in water and opposite trend was observed in water-ethanol mixture. © 2015 Elsevier Ltd.

Original language	English
Pages (from-to)	416-419
Journal	Bioresource Technology
Volume	190
DOIs	https://doi.org/10.1016/j.biortech.2015.04.074
Publication status	Published - 1 Aug 2015
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Acid/base
Depolymerization
Hydrolysis lignin
Water
Water-ethanol mixture

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title = "Hydrolytic depolymerization of hydrolysis lignin: Effects of catalysts and solvents",

abstract = "Hydrolytic depolymerization of hydrolysis lignin (HL) in water and water-ethanol co-solvent was investigated at 250°C for 1h with 20\% (w/v) HL substrate concentration with or without catalyst (H2SO4 or NaOH). The obtained depolymerized HLs (DHLs) were characterized with GPC-UV, FTIR, GC-MS, 1H NMR and elemental analyzer. In view of the utilization of depolymerized HL (DHL) for the preparation of rigid polyurethane foams/resins un-catalyzed depolymerization of HL employing water-ethanol mixture appeared to be a viable route with high yield of DHL \textasciitilde{}70.5wt.\% (SR yield of \textasciitilde{}9.8wt.\%) and with Mw as low as \textasciitilde{}1000g/mole with suitable aliphatic (227.1mgKOH/g) and phenolic (215mgKOH/g) hydroxyl numbers. The overall \% carbon recovery under the selected best route was \textasciitilde{}87\%. Acid catalyzed depolymerization of HL in water and water-ethanol mixture lead to slightly increased Mw. Alkaline hydrolysis helped in reducing Mw in water and opposite trend was observed in water-ethanol mixture. {\textcopyright} 2015 Elsevier Ltd.",

keywords = "Acid/base, Depolymerization, Hydrolysis lignin, Water, Water-ethanol mixture",

author = "Nubla Mahmood and Zhongshun Yuan and John Schmidt and Xu, \{Chunbao Charles\}",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected]. ",

year = "2015",

month = aug,

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doi = "10.1016/j.biortech.2015.04.074",

language = "English",

volume = "190",

pages = "416--419",

journal = "Bioresource Technology",

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TY - JOUR

T1 - Hydrolytic depolymerization of hydrolysis lignin

T2 - Effects of catalysts and solvents

AU - Mahmood, Nubla

AU - Yuan, Zhongshun

AU - Schmidt, John

AU - Xu, Chunbao Charles

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2015/8/1

Y1 - 2015/8/1

N2 - Hydrolytic depolymerization of hydrolysis lignin (HL) in water and water-ethanol co-solvent was investigated at 250°C for 1h with 20% (w/v) HL substrate concentration with or without catalyst (H2SO4 or NaOH). The obtained depolymerized HLs (DHLs) were characterized with GPC-UV, FTIR, GC-MS, 1H NMR and elemental analyzer. In view of the utilization of depolymerized HL (DHL) for the preparation of rigid polyurethane foams/resins un-catalyzed depolymerization of HL employing water-ethanol mixture appeared to be a viable route with high yield of DHL ~70.5wt.% (SR yield of ~9.8wt.%) and with Mw as low as ~1000g/mole with suitable aliphatic (227.1mgKOH/g) and phenolic (215mgKOH/g) hydroxyl numbers. The overall % carbon recovery under the selected best route was ~87%. Acid catalyzed depolymerization of HL in water and water-ethanol mixture lead to slightly increased Mw. Alkaline hydrolysis helped in reducing Mw in water and opposite trend was observed in water-ethanol mixture. © 2015 Elsevier Ltd.

AB - Hydrolytic depolymerization of hydrolysis lignin (HL) in water and water-ethanol co-solvent was investigated at 250°C for 1h with 20% (w/v) HL substrate concentration with or without catalyst (H2SO4 or NaOH). The obtained depolymerized HLs (DHLs) were characterized with GPC-UV, FTIR, GC-MS, 1H NMR and elemental analyzer. In view of the utilization of depolymerized HL (DHL) for the preparation of rigid polyurethane foams/resins un-catalyzed depolymerization of HL employing water-ethanol mixture appeared to be a viable route with high yield of DHL ~70.5wt.% (SR yield of ~9.8wt.%) and with Mw as low as ~1000g/mole with suitable aliphatic (227.1mgKOH/g) and phenolic (215mgKOH/g) hydroxyl numbers. The overall % carbon recovery under the selected best route was ~87%. Acid catalyzed depolymerization of HL in water and water-ethanol mixture lead to slightly increased Mw. Alkaline hydrolysis helped in reducing Mw in water and opposite trend was observed in water-ethanol mixture. © 2015 Elsevier Ltd.

KW - Acid/base

KW - Depolymerization

KW - Hydrolysis lignin

KW - Water

KW - Water-ethanol mixture

UR - https://www.scopus.com/pages/publications/84930178859

UR - https://www.scopus.com/pages/publications/84930178859#tab=impact

U2 - 10.1016/j.biortech.2015.04.074

DO - 10.1016/j.biortech.2015.04.074

M3 - RGC 21 - Publication in refereed journal

C2 - 25936442

SN - 0960-8524

VL - 190

SP - 416

EP - 419

JO - Bioresource Technology

JF - Bioresource Technology

ER -

Hydrolytic depolymerization of hydrolysis lignin: Effects of catalysts and solvents

Abstract

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Research Keywords

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