서울대학교 중앙도서관
S-Space 소개
My S-Space
로그인이 필요합니다.
Login

S-Space

Publications

Detailed Information

Peracetic acid treatment of lignins for selective production of valuable chemiclas : 리그닌 유래 유용화합물의 선택적 생산을 위한 과초산 처리

DC Field Value Language
dc.contributor.advisor최인규-
dc.contributor.author박세영-
dc.date.accessioned2018-11-12T00:58:59Z-
dc.date.available2018-11-12T00:58:59Z-
dc.date.issued2018-08-
dc.identifier.other000000152861-
dc.identifier.urihttps://hdl.handle.net/10371/143219-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 농업생명과학대학 산림과학부(환경재료과학전공), 2018. 8. 최인규.-
dc.description.abstractThis study was conducted to investigate the degradation characteristics of lignin depending on the peracetic acid (PAA) and hydrogen peroxide (HP) concentrations, and to produce the low-molecular weight lignins by controlling the reaction conditions. In addition, reaction conditions for producing the definite products from lignin were investigated. Fractionation of the PAA-treated lignin depending on their molecular weight range was carried out by using open-column with selecting several solvents.

Acetic acid (AA) and HP were mixed at a ratio of 4:1, 1.5:1, 1:1, 1:1.5, and 1:5 (v/v) for preparing the PAA solution. After PAA treatment, the highest solid degradation rates were obtained as 29.0% and 65.3% at 1:1.5 (v/v) for alkali and kraft lignin, respectively. However, degradation characteristics of two lignins were different		-
dc.description.tableofcontentsChapter 1 Introduction 1

1. Background 2

1.1. Potential of lignin as a bio-based source 2

1.2. Lignin structures & technical lignins 5

1.3. Complete valorization of lignin 8

1.4. Promising conversion processes for producing valued-products 11

1.5. Peroxy acid as an emerging oxidant for lignin valorization 15

2. Objectives 17

3. Literature review 19

3.1. Lignin behavior in acidic and alkaline medium 19

3.2. Lignin oxidizing agents 21

3.3. Production of chemicals in lignin 24

3.3.1. Aromatic chemicals 24

3.3.2. Dicarboxylic acid chemicals 25

3.3.3. Oligomeric and partially depolymerized chemicals 26

3.4. Methods for fractionation of lignin and its extracts 29

3.5. Chemical modification 31

Chapter 2 Degradation characteristics of technical lignins depending on peracetic acid concentration at room temperature 34

1. Introduction 35

2. Materials and methods 37

2.1. Materials 37

2.2. Peracetic acid treatment 39

2.2.1. Peracetic acid preparation 39

2.2.2. Peracetic acid solution titration 39

2.2.3. Peracetic acid treatment 40

2.3. Solid fraction analysis 42

2.3.1. Nitrobenzene oxidation (NBO) 42

2.3.2. Phosphorus-31 nuclear magnetic resonance (31P-NMR) 42

2.3.3. Gel permeation chromatography (GPC) 43

2.4. Liquid fraction analysis 44

2.4.1. Solvent extraction 44

2.4.2. Chemical properties of lignin compounds 44

2.4.2.1. Gel permeation chromatography (GPC) 44

2.4.2.2. Ultraviolet (UV)-visible spectroscopy 45

2.4.2.3. Gas chromatography-Mass spectrometry (GC/MS) 45

3. Results and discussion 46

3.1. Concentration of PAA solution depending on the mix ratio 46

3.2. Degradation rate during peracetic acid treatment 48

3.3. Solid fraction analysis 52

3.3.1. Nitrobenzene oxidation products 52

3.3.2. Hydroxyl group contents 56

3.3.3. Molecular weight distribution 59

3.4. Liquid fraction analysis 62

3.4.1. Lignin-derived compound distribution 62

3.4.2. Phenolic hydroxyl group distribution 66

3.4.3. Molecular weight distribution 70

4. Summary 73

Chapter 3 Peracetic acid-induced depolymerization of technical lignins and its chemical properties 74

1. Introduction 75

2. Materials and methods 77

2.1. Materials 77

2.2. Peracetic acid liquefaction 78

2.2.1. Peracetic acid preparation 78

2.2.2. Peracetic acid solution titration 78

2.2.3. Peracetic acid liquefaction 78

2.3. Liquified lignin analysis 79

2.3.1. Solvent extraction 79

2.3.2. Chemical properties of lignin compounds in ethyl acetate fractions 79

2.3.3. Residual fractions 79

2.3.3.1. Fourier-transform infrared spectroscopy (FT-IR) 79

3. Results and discussion 80

3.1. Solid degradation rate 80

3.2. Chemical properties of liquefied lignin 83

3.2.1. Relative portions of ethyl acetate and residual fractions in liquefied lignin 83

3.2.2. Ethyl acetate fraction 86

3.2.2.1. Lignin-derived monomeric compounds 86

3.2.2.1.1. Monomeric compound distribution 86

3.2.2.1.2. Monomeric compound yields 91

3.2.2.2. Phenolic hydroxyl group distribution 93

3.2.2.3. Molecular weight distribution 95

3.2.3. Residual fractions 99

3.2.3.1. Structural changes 99

4. Summary 102

Chapter 4 Open-column fractionation of peracetic acid-treated kraft lignin and its characterization for value-added applications 103

1. Introduction 104

2. Materials and methods 106

2.1. Materials 106

2.2. Peracetic acid liquefaction of lignin 106

2.3. Fractionation of liquefied lignin 108

2.4. Chemical properties of lignin fractions 110

2.4.1. Gel permeation chromatography (GPC) 110

2.4.2. Phosphorus-31 nuclear magnetic resonance (31P-NMR) 110

2.5. Structural changes 111

2.5.1. Carbon-13 nuclear magnetic resonance (13C-NMR) 111

2.5.2. Fourier-transform infrared spectroscopy (FT-IR) 111

3. Results and discussion 112

3.1. Yield of each fraction 112

3.2. Molecular weight distribution 114

3.3. Hydroxyl group contents 118

3.4. Structural analysis 121

3.4.1. 13C-NMR 121

3.4.2. FT-IR 124

4. Summary 127

Chapter 5 Concluding remarks 128

References 131

초록 154
-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subject.ddc634.9-
dc.titlePeracetic acid treatment of lignins for selective production of valuable chemiclas-
dc.title.alternative리그닌 유래 유용화합물의 선택적 생산을 위한 과초산 처리-
dc.typeThesis-
dc.contributor.AlternativeAuthorSe-Yeong Park-
dc.description.degreeDoctor-
dc.contributor.affiliation농업생명과학대학 산림과학부(환경재료과학전공)-
dc.date.awarded2018-08-
Appears in Collections:
Files in This Item:

Altmetrics

Item View & Download Count

Show Simple Item Record
Find it @ SNU

  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Share

qrcode
SNS Share