Sökning: "extractives"

Visar resultat 1 - 5 av 34 avhandlingar innehållade ordet extractives.

  1. 1. Studies on wood extractives

    Detta är en avhandling från Stockholm

    Författare :Jarl Runeberg; Stockholms universitet.; [1961]
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  2. 2. Efficient treatment of forest industrial wastewaters Energy efficiency and resilience during disturbances

    Detta är en avhandling från Karlstad : Karlstads universitet

    Författare :Maria Sandberg; Karlstads universitet.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forest industry; wastewater; oxygen transfer rate; black liquor; surface active; extractives; Miljö- och energisystem; Environmental and Energy Systems;

    Sammanfattning : This work concerns the efficient treatment of wastewaters from pulp and paper mills by means of aerobic biological processes. For treatment processes there are many aspects of efficiency and the present study investigates both energy efficiency and purification efficiency during disturbances. LÄS MER

  3. 3. The initial phase of the sodium bisulfite pulping of softwood dissolving pulp

    Detta är en avhandling från Karlstad : Karlstads universitet

    Författare :Raghu Deshpande; Karlstads universitet.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Activation energy; bisulfite pulping; cellulose; delignification; extractives; glucomannan; hemicelluloses; lignin; pine; spruce; thiosulfate; total SO2; xylan; Chemical Engineering; Kemiteknik;

    Sammanfattning : The sulfite pulping process is today practised in only a small number of pulp mills around the globe and the number of sulfite mills that use sodium as the base (cation) is less than five. However, due to the increasing interest in the wood based biorefinery concept, the benefits of sulfite pulping and especially the sodium based variety, has recently gained a lot of interest. LÄS MER

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

    Detta är en avhandling från Karlstad : Karlstads universitet

    Författare :Raghu Deshpande; Karlstads universitet.; [2016]
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  5. 5. Coated Norway Spruce Influence of Wood Characteristics on Water Sorption and Coating Durability

    Detta är en avhandling från Växjö : Linnaeus University Press

    Författare :Tinh Sjökvist; Linnéuniversitetet.; [2019]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Heartwood; Sapwood; Wood extractives; Moisture content; Paint; Alkyd; Acrylic; Linseed oil; Calcimine paint; Mould; Fungi; Algae; Weathering; Forestry and Wood Technology; Skog och träteknik;

    Sammanfattning : Wood used outdoors is often degraded and discoloured by microorganisms as a natural part of its life cycle, particularly when exposed to high levels of moisture for prolonged times. In this case, the application of a coating (i.e. paint) is an option for increasing the service life of the wood. LÄS MER