Search for dissertations about: "thermodynamic activity"

Showing result 16 - 20 of 75 swedish dissertations containing the words thermodynamic activity.

  2. 16. Lipases as Biocatalysts in Organic Media. Influence of Enzyme Preparation and Reaction Conditions on Activity and Selectivity

    Author : Mattias Persson; Avdelningen för klinisk kemi och farmakologi; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biochemical technology; Bioteknik; Biotechnology; water activity; temperature; enantioselectivity; immobilisation; organic solvents; lyophilisation; Lipases; Accurel EP-100; Biokemisk teknik; Proteins; enzymology; Proteiner; enzymologi;

    Abstract : The discovery that enzymes can function in organic solvents has broadened the scope of biocatalysis, making enzymes highly useful tools for organic chemists. The widespread use of enzymes as catalysts in organic solvents has, however, been limited by the low activity obtained for enzymes in organic solvents compared to aqueous solutions. READ MORE

  4. 17. Thermodynamic modelling of black liquor-related solutions. Pitzer method for estimating activities, solubilities and boiling point rise

    Author : Marta Anna Bialik; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; activity coefficient; black liquor; boiling point rise elevation ; osmotic coefficient; solubility; Pitzer method; sodium sulphate dicarbonate; burkeite;

    Abstract : Black liquor is considered as being one of the most important process streams as far as the design and optimization of kraft pulp mills are concerned. Many methods have been developed in order to describe and, possibly, predict its physico-chemical properties. Most of them are, however, empirical methods that are difficult to generalize. READ MORE

  5. 18. Solid-liquid Phase Equilibria and Crystallization of Disubstituted Benzene Derivatives

    Author : Fredrik Nordström; Åke Rasmuson; Gerard Coquerel; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Salicylic acid; m-hydroxybenzoic acid; p-hydroxybenzoic acid; salicylamide; m-aminobenzoic acid; p-aminobenzoic acid; solubility; solid-liquid equilibria; thermodynamics; activity of the solid phase; ideal solubility; activity coefficient; van t Hoff enthalpy of solution; solid state; solution properties; metastable zone width; primary nucleation; nucleation kinetics; Chemical engineering; Kemiteknik;

    Abstract : The Ph.D. project compiled in this thesis has focused on the role of the solvent in solid-liquid phase equilibria and in nucleation kinetics. Six organic substances have been selected as model compounds, viz. READ MORE

  6. 19. Thermodynamic study of the FeO-MgO-Al2O3-SiO2 system : Data assessment and phase diagram calculation

    Author : Olga Fabrichnaya; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Abstract : This dissertation consists of assessed thermodynamic properties for phases in the geologically and industrially important system Fe-Mg-Al-Si-O and calculated phase diagrams. Mathematical processing of different kinds of experimental data (phase equilibrium data, calorimetric, volumetric, thermophysical,electrochemical, activity data) is used to derive internally consistent thermodynamic database. READ MORE

  7. 20. Biocatalysis in Organic Media: Parameters Influencing Activity, Stability and Enantioselectivity

    Author : David Costes; Bioteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kemiteknik och kemisk teknologi; Chemical technology and engineering; Biotechnology; Bioteknik; Proteins; enzymology; Proteiner; enzymologi;

    Abstract : Biocatalysis in organic media offers very attractive methods to prepare fine chemicals. The biocatalyst performance regarding activity, stability and enantioselectivity will determine the viability of the bio-process. READ MORE