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Dogaris, I., Lindström, M. & Henriksson, G. (2019). Critical parameters for tall oil separation I: The importance of the ratio of fatty acids to rosin acids. TAPPI Journal, 18(9), 547-555
Open this publication in new window or tab >>Critical parameters for tall oil separation I: The importance of the ratio of fatty acids to rosin acids
2019 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 18, no 9, p. 547-555Article in journal (Refereed) Published
Abstract [en]

Tall oil is a valuable byproduct in chemical pulping of wood, and its fractions have a large spectrum of applications as chemical precursors, detergents, and fuel. High recovery of tall oil is important for the economic and environmental profile of chemical pulp mills. The purpose of this study was to investigate critical parameters of tall oil separation from black liquor. To investigate this in a controlled way, we developed a model test system using a "synthetic" black liquor (active cooking chemicals OH- and HS- ions), a complete process for soap skimming, and determination of recovered tall oil based on solvent extraction and colorimetric analysis, with good reproducibility. We used the developed system to study the effect of the ratio of fatty acids to rosin acids on tall oil separation. When high amounts of rosin acids were present, tall oil recovery was low, while high content of fatty acids above 60% significantly promoted tall oil separation. Therefore, manipulating the content of fatty acids in black liquor before the soap skimming step can significantly affect the tall oil solubility, and hence its separation. The findings open up chemical ways to improve the tall oil yield. Application: Controlling the ratio of fatty acids to rosin acids in kraft pulping can significantly affect the tall oil separation and improve its yield and quality.

Place, publisher, year, edition, pages
TECH ASSOC PULP PAPER IND INC, 2019
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-262797 (URN)10.32964/TJ18.9.547 (DOI)000488856500003 ()
Note

QC 20191021

Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-10-21Bibliographically approved
Martín-Yerga, D., Henriksson, G. & Cornell, A. M. (2019). Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media. Electrocatalysis
Open this publication in new window or tab >>Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media
2019 (English)In: Electrocatalysis, ISSN 1868-2529, E-ISSN 1868-5994Article in journal (Refereed) Published
Abstract [en]

Nickel (oxy)hydroxides (NiOxHy) are promising cost-effective materials that exhibit a fair catalytic activity for the ethanol oxidation reaction (EOR) and could be used for sustainable energy conversion. Doping the NiOxHy structure with other metals could lead to enhanced catalytic properties but more research needs to be done to understand the role of the doping metal on the EOR. We prepared NiOxHy films doped with Fe or Co with different metallic ratios by electrodeposition and evaluated the EOR. We found a positive and negative effect on the catalytic activity after the incorporation of Co and Fe, respectively. Our results suggest that Ni atoms are the active sites for the EOR since Tafel slopes were similar on the binary and pristine nickel (oxy)hydroxides and that the formal potential of the Ni(II)/Ni(III) redox couple is a good descriptor for the EOR activity. This work also highlights the importance of controlled metal doping on catalysts and may help in the design and development of improved materials for the EOR.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-255716 (URN)10.1007/s12678-019-00531-8 (DOI)000486206000004 ()2-s2.0-85065205442 (Scopus ID)
Note

QC 20190828

Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-10-04Bibliographically approved
Berglund, J., Mikkelsen, D., Flanagan, B., Dhital, S., Henriksson, G., Lindström, M., . . . Vilaplana, F. (2019). Hydrogels of bacterial cellulose and wood hemicelluloses as a model of plant secondary cell walls. Paper presented at National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL. Abstracts of Papers of the American Chemical Society, 257
Open this publication in new window or tab >>Hydrogels of bacterial cellulose and wood hemicelluloses as a model of plant secondary cell walls
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2019 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 257Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-257620 (URN)000478860502446 ()
Conference
National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL
Note

QC 20190918

Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-10-16Bibliographically approved
Moser, C., Henriksson, G. & Lindström, M. (2019). Structural aspects on the manufacturing of cellulose nanofibers from wood pulp fibers. BioResources, 14(1), 2269-2276
Open this publication in new window or tab >>Structural aspects on the manufacturing of cellulose nanofibers from wood pulp fibers
2019 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 14, no 1, p. 2269-2276Article in journal (Refereed) Published
Abstract [en]

The exact mechanism behind the disintegration of chemical pulp fiber into cellulose nanofibers is poorly understood. In this study, samples were subjected to various homogenization cycles, indicating that the mechanism is a stepwise process. In the earlier stages of the mechanical process, a large amount of macrofibrils were created as the larger structures disappeared. Upon mechanical treatment these macrofibrils disappeared despite the increasing yield of cellulose nanofibers. The proposed model expands the understanding of the disintegration pathway and may provide additional insight as to how wood cells are converted into microfibrils.

Place, publisher, year, edition, pages
North Carolina State University, 2019
Keywords
Cellulose, Hierarchy, Macrofibrils, Nanofibers
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-244204 (URN)10.15376/biores.14.1.2269-2276 (DOI)000459494400155 ()2-s2.0-85061333292 (Scopus ID)
Note

QC 20190218

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-03-15Bibliographically approved
Dogaris, I., Lindström, M. & Henriksson, G. (2019). Study on tall oil solubility for improved resource recovery in chemical pulping of wood. Paper presented at 257th National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL. Abstracts of Papers of the American Chemical Society, 257
Open this publication in new window or tab >>Study on tall oil solubility for improved resource recovery in chemical pulping of wood
2019 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 257Article in journal, Meeting abstract (Other academic) Published
Abstract [en]

Tall oil is one of the most valuable by products in chemical pulpingof wood and is considered an important renewable alternative to petroleum.Its fractions have a large spectrum of applications including chemicalprecursors, detergents and energy. High recovery of tall oil is important forthe economic, sustainability, and environmental profile of industrial chemicalpulping. The purpose of this study was to develop ways to increase the yieldof tall oil based on its solubility in black liquors.To investigate this in a controlled way, a model system with a “synthetic”black liquor and a complete methodology for soap skimming anddetermination of recovered tall oil was developed based on solvent extractionand colorimetric analysis with good reproducibility. This model system allowsinvestigations of different parameters in small scale with high control overdifferent conditions.The developed system was used to study the effect of fatty acid addition andthe effect of lignin content on improving tall oil recovery. The presence ofrosin acids in the black liquor significantly reduced soap separation, whileincreasing the fatty acid content up to 60-70% greatly improved soaprecovery. Addition of lignin reduced tall oil recovery in the case of liquors withmore than 50% fatty acids, but slightly increased recovery in liquors withmore than 50% rosin acids. Furthermore, the presence of some ligninseemed to promote separation of the tall oil (reduced its solubility), while highamounts led to inhibition of its recovery.The experimental results clearly indicated that manipulating the content offatty acids and/or lignin before the soap skimming step significantly affect thetall oil solubility, opening up for chemical ways to improve its recovery.However, experiments in real industrial liquors and pulp mill conditions shouldbe considered to assess the actual tall oil yield improvement and processeconomics.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-257661 (URN)000478861201242 ()
Conference
257th National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL
Note

QC 20190903

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-11-05Bibliographically approved
Abbadessa, A., Oinonen, P. & Henriksson, G. (2018). Characterization of Two Novel Bio-based Materials from Pulping Process Side Streams: Ecohelix and CleanFlow Black Lignin. BioResources, 13(4), 7606-7627
Open this publication in new window or tab >>Characterization of Two Novel Bio-based Materials from Pulping Process Side Streams: Ecohelix and CleanFlow Black Lignin
2018 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 13, no 4, p. 7606-7627Article in journal (Refereed) Published
Abstract [en]

The characteristics of two novel types of technical lignin, namely Ecohelix (EH) and CleanFlow black lignin (CFBL), isolated from two different pulping process side streams, were analyzed. EH and CFBL were analyzed in terms of general composition, chemical functionalities, molar mass distribution, and thermal stability. For comparison, two relevant types of commercially available lignosulfonate and kraft lignin were used. The results showed that EH contains a large amount of sulfonated lignin, together with carbohydrates and ash. As such, it can be considered a lignin-carbohydrate hybrid molecule. CFBL was found to contain 91.5% Klason lignin and the lowest amount of carbohydrates (0.3%). EH showed the highest content of aliphatic OH groups (5.44 mmol/g) and CFBL a high content of phenols (4.73 mmol/g). EH had a molecular weight of 31.4 kDa and a sufficient thermal stability. CFBL had the lowest molecular weight (M-w = 2.0 kDa) and thermal stability of all kraft lignins analyzed in this study. These properties highlighted that EH is a suitable building block for material development and that CFBL is a promising material for the production of biofuel and biochemicals.

Place, publisher, year, edition, pages
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI, 2018
Keywords
Lignin characterization, Lignin-carbohydrate complexes, Laccase, Ultrafiltered lignin, Kraft lignin, Lignosulfonate, RUITER GA, 1992, ANALYTICAL BIOCHEMISTRY, V207, P176 Kendry P, 2002, BIORESOURCE TECHNOLOGY, V83, P55 woko M, 2005, BIOMACROMOLECULES, V6, P3467
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-241237 (URN)10.15376/biores.13.4.7606-7627 (DOI)000454215100033 ()
Note

QC 20190116

Available from: 2019-01-16 Created: 2019-01-16 Last updated: 2019-03-18Bibliographically approved
Moser, C., Henriksson, G. & Lindström, M. (2018). Improved dispersibility of once-dried cellulose nanofibers in the presence of glycerol. Nordic Pulp & Paper Research Journal
Open this publication in new window or tab >>Improved dispersibility of once-dried cellulose nanofibers in the presence of glycerol
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669Article in journal (Refereed) Epub ahead of print
Abstract [en]

To investigate the dispersibility of dried cellulose nanofibers (CNFs), various additions (glycerol, octanol, glycol, and sodium perchlorate) were added to CNFs prior to drying. Glycerol was the only species to show any significant effect on re-dispersibility. The sedimentation was slower, and the transmittance of the solution was comparable to that of its undried counterpart. Increasing the amount of glycerol showed a clear trend with regard to dispersibility. The mechanical properties of films were maintained for samples that were dried and redispersed in the presence of glycerol.

Place, publisher, year, edition, pages
Berlin: De Gruyter Open, 2018
Keywords
cellulose nanofibers, CNF, drying, glycerol, hornification, MFC, redispersion
National Category
Paper, Pulp and Fiber Technology
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-238860 (URN)10.1515/npprj-2018-0054 (DOI)000451437900008 ()2-s2.0-85056550081 (Scopus ID)
Note

QC 20181120

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2018-12-21Bibliographically approved
Martinez-Abad, A., Quero, A. J., Berglund, J., Giummarella, N., Henriksson, G., Lindström, M., . . . Vilaplana, F. (2018). Influence of the molecular structure of wood hemicelluloses on the recalcitrance of lignocellulosic biomass. Paper presented at 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA. Abstract of Papers of the American Chemical Society, 255
Open this publication in new window or tab >>Influence of the molecular structure of wood hemicelluloses on the recalcitrance of lignocellulosic biomass
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2018 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240163 (URN)000435537702769 ()
Conference
255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA
Note

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved
Henriksson, G., Berglund, J., Wohlert, J., Lawoko, M., Aminzadeh, S., Lindström, M. & Vilaplana, F. (2018). Non-cellulose wood polysaccharides - a need for a stricter structural and functional classification?. Paper presented at 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA. Abstract of Papers of the American Chemical Society, 255
Open this publication in new window or tab >>Non-cellulose wood polysaccharides - a need for a stricter structural and functional classification?
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2018 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240158 (URN)000435537702766 ()
Conference
255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA
Note

QC 20190108

Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved
Zhao, Y., Moser, C. & Henriksson, G. (2018). Transparent Composites Made from Tunicate Cellulose Membranes and Environmentally Friendly Polyester. ChemSusChem, 11(10), 1728-1735
Open this publication in new window or tab >>Transparent Composites Made from Tunicate Cellulose Membranes and Environmentally Friendly Polyester
2018 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 11, no 10, p. 1728-1735Article in journal (Refereed) Published
Abstract [en]

A series of optically transparent composites were made by using tunicate cellulose membranes, in which the naturally organized cellulose microfibrillar network structure of tunicate tunics was preserved and used as the template and a solution of glycerol and citric acid at different molar ratios was used as the matrix. Polymerization through ester bond formation occurred at elevated temperatures without any catalyst, and water was released as the only byproduct. The obtained composites had a uniform and dense structure. Thus, the produced glycerol citrate polyester improved the transparency of the tunicate cellulose membrane while the cellulose membrane provided rigidity and strength to the prepared composite. The interaction between cellulose and polyester afforded the composites high thermal stability. Additionally, the composites were optically transparent and their shape, strength, and flexibility were adjustable by varying the formulation and reaction conditions. These composites of cellulose, glycerol, and citric acid are renewable and biocompatible and have many potential applications as structural materials in packaging, flexible displays, and solar cells.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2018
Keywords
carbohydrates, gels, membranes, nanostructures, polymerization
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-231215 (URN)10.1002/cssc.201800627 (DOI)000434216800017 ()29644799 (PubMedID)2-s2.0-85046335513 (Scopus ID)
Note

QC 20180628

Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-12-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8817-2031

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