Search for dissertations about: "Lignin"

Showing result 1 - 5 of 220 swedish dissertations containing the word Lignin.

  1. 1. Viscosity and boiling point elevation of black liquor from the lignin extraction process and the modification of extracted lignin

    University dissertation from Chalmers University of Technology

    Author : Ali Moosavifar; Chalmers tekniska högskola.; Chalmers University of Technology.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cellulosa- och pappersteknik; Cellulose and paper engineering; Black liquor; black liquor properties; viscosity; Boiling point elevation; evaporation characteristic; alkalisation of black liquor; Lignin; Lignin precipitation; combustion of lignin; lignin modification; calcium addition to lignin; lignin fuel;

    Abstract : .... READ MORE

  2. 2. Palladium-catalyzed lignin valorization Towards a lignin-based biorefinery

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Maxim Galkin; Uppsala universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Lignin; Heterogeneous Catalysis; Palladium; Biomass; Depolymerization; Reduction; Oxidation; Biorefinery; Transfer Hydrogenolysis; Organisk kemi; Organic Chemistry;

    Abstract : The work described in this thesis focuses on the cleavage of the β-O-4′ bond, which is the most abundant interunit linkage in the lignin polymer.In the first part, three methods based on palladium catalysis have been developed and their applicability has been verified using lignin model compounds. READ MORE

  3. 3. Lignin Extraction from Black Liquor - Properties of the Liquors and Sulphur Content in the Lignin

    University dissertation from Chalmers University of Technology

    Author : Ali Moosavifar; Chalmers tekniska högskola.; Chalmers University of Technology.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cellulosa- och pappersteknik; Cellulose and paper engineering; Black liquor; properties; viscosity; boiling point elevation; alkalisation; lignin; lignin precipitation; combustion of lignin; lignin modification; biofuel; heat-treatment; viscosity correlations.;

    Abstract : Kraft lignin isolated by precipitation can be considered as being a valuable renewable source of energy and material. Removing lignin from black liquor is also advantageous as it decreases the load on the recovery boiler, which is usually the limiting factor in the production of kraft pulp. READ MORE

  4. 4. Towards a pure kraft lignin

    University dissertation from Chalmers University of Technology

    Author : Rufus Ziesig; Chalmers tekniska högskola.; Chalmers University of Technology.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lignin; LignoBoost; inorganics; precipitation; black liquor; carbohydrate; impurities; purification;

    Abstract : The most widely used production method for paper pulp in the world is kraft pulping. In chemical pulping the polymer, lignin, which binds the wood fibres together, is partly depolymerized. This allows the wood fibres to be separated from each other. READ MORE

  5. 5. The initial phase of sodium sulfite pulping of softwood A comparison of different pulping options

    University dissertation from Karlstad : Karlstads universitet

    Author : Raghu Deshpande; Karlstads universitet.; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Activation energy; acid sulfite pulping; bisulfite pulping; cellulose; delignification; dissolving pulp; extractives; glucomannan; hemicelluloses; lignin; lignin condensation; lignin carbohydrate complexes; pine; spruce; thiosulfate; total SO2; xylan; Chemical Engineering; Kemiteknik;

    Abstract : Single stage and two-stage sodium sulfite cooking were carried out on either spruce, pine or pure pine heartwood chips to investigate the influence of several process parameters on the initial phase of such a cook down to about 60 % pulp yield. The cooking experiments were carried out in the laboratory with either a lab-prepared or a mill-prepared cooking acid and the temperature and time were varied. READ MORE