Sökning: "precipitation black liquor"

Visar resultat 16 - 19 av 19 avhandlingar innehållade orden precipitation black liquor.

  1. 16. Model for activity coefficients and solubilities of Na2CO3 and Na2SO4 in high-temperature solutions

    Författare :Marta Anna Bialik; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; scaling; Pitzer model; activity coefficient; solubility; sodium carbonate; sodium sulfate; boiling point raise; double salt; solid solution; burkeite;

    Sammanfattning : Scaling of sodium sulfate and sodium carbonate double salts has long been recognized as a problem in the black liquor evaporation process. These salts are abundant in black liquor and often tend to precipitate on heat transfer areas, thereby significantly decreasing the heat transfer efficiency. LÄS MER

  3. 17. On calcium-related problems in kraft pulping of Eucalyptus dunnii

    Författare :Vijaya Lakshmi Vegunta; Olena Sevastyanova; Helena Håkansson; KTH; []
    Nyckelord :Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : Kraft pulping is the most widely used pulping process for producing chemical pulp today. It has been in use for more than 130 years. LÄS MER

  4. 18. Membrane Filtration for Fractionation of Biomass Compounds - Process Design for the Separation of Hemicelluloses and Lignin from Alkaline Solutions

    Författare :Anders Arkell; Avdelningen för kemiteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : It is important to replace fossil resources such as oil, coal and natural gas with renewable raw materials for the production of materials and fuels in order to reduce environmental impact. Furthermore, these raw materials should preferably be residues, e.g. LÄS MER

  5. 19. Base-catalyzed depolymerization of kraft lignin for valuable chemical production

    Författare :Kena Li; Avdelningen för kemiteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kraft lignin; Depolymerization; CFR; Membrane filtration; Guaiacol; Vanillin; bioconversion;

    Sammanfattning : Lignin is one of the three predominant biopolymers that make up plants together with cellulose and hemicellulose, and it is the only plant component that is based on aromatic units. The industrial kraft pulping process generates large amounts of lignin, which is currently used to generate heat for the process. LÄS MER