Sökning: "supercritical"

Visar resultat 11 - 15 av 94 avhandlingar innehållade ordet supercritical.

  1. 11. Supercritical fluid extraction of bioactive compounds from berry seeds

    Författare :Graziele Gustinelli Carvalho; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tocopherols; Carotenoids; Fatty acids; Anti-oxidative activity; Berry seed oils; Microscopy.; Tocotrienols; Supercritical CO2 extraction;

    Sammanfattning : Industrial processing of berries into food and beverages generates seeds as a by-product. Most of these seeds are treated as waste even though they contain valuable biological compounds. An approach to adding value to the process is to extract these compounds from the seeds. LÄS MER

  3. 12. Theoretical and Computational Study on the Onset of Heat Transfer Deterioration in Supercritical Water

    Författare :Maria Jaromin; Henryk Anglart; Bojan Niceno; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; supercritical water; variable properties; heat transfer deterioration; SRA - Energy; SRA - Energi;

    Sammanfattning : .... LÄS MER

  4. 13. Superhydrophobic coatings of wax and polymers sprayed from supercritical solutions

    Författare :Louise Ovaskainen; Lars Wågberg; Charlotta Turner; Eric Beckman; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; superhydrophobic coatings; polymer; wax; supercritical carbon dioxde; RESS; Chemical Engineering; Kemiteknik;

    Sammanfattning : The possibility of using supercritical carbon dioxide (scCO2) as the primary solvent in a spray process for producing superhydrophobic surfaces have been examined in this work. Using scCO2 as solvent will have considerably lower environmental impact compared to an organic solvent since scCO2 is considered a green solvent as it is non-toxic, non-flammable and recyclable. LÄS MER

  5. 14. Palladium(0)-Catalyzed Synthesis of Spirocycles and Supercritical Chemistry using a Resistively Heated Flow Reactor

    Författare :Ahmed Adeyemi; Mats Larhed; Luke R. Odell; Kenneth Wärnmark; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Continuous Flow; Resistive heating; Supercritical fluids; high-temperature synthesis; Mizoroki-Heck reaction; Spirooxindoles; Spiroethers; Spirobenzofuranes; Unnatural Amino Acids;

    Sammanfattning : This doctoral thesis focusses on an effective and selective approach to the synthesis of spirocycles using palladium(0)-catalyzed Mizoroki-Heck reactions. In addition, selective and efficient chemistry was highlighted by the design and evaluation of a novel resistively heated system for continuous flow (CF) synthesis for high-temperature and high-pressure applications. LÄS MER

  7. 15. Determination of Fat-Soluble Vitamins in Foods Based on Supercritical Fluid Extraction

    Författare :Charlotta Turner; Kemiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supercritical fluid extraction; Solvent collection; Solid phase trapping; SFE; Selectivity; Retinol; Milk powder; Lipase; Food; Enzymatic hydrolysis; Alcoholysis; Candida antarctica; Tocopherol; Vitamins; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Sample clean-up methodologies based on supercritical fluid extraction (SFE) have been developed for determination of fat-soluble vitamins in foods. This thesis focuses on method development, stressing important issues concerning sample pre-treatment, extraction conditions and collection parameters. LÄS MER