Search for dissertations about: "supercritical carbon dioxide"

Showing result 1 - 5 of 29 swedish dissertations containing the words supercritical carbon dioxide.

2. 1. Lipase-Catalysed Lipid Modifications in Supercritical Carbon Dioxide

   Author : Helga Gunnlaugsdottir; Livsmedelsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; immobilisation support; enzymes; pressure; phase behaviour; flow rate; process parameters; supercritical carbon dioxide; Lipase; lipids; Food and drink technology; Livsmedelsteknik;

   Abstract : The production of ethyl esters (EE) from ethanol and cod-liver oil by an immobilised lipase in supercritical carbon dioxide (SCCO2) is described. This reaction results in a complex mixture of lipid components consisting of triglycerides, diglycerides, monoglycerides and ethyl esters. READ MORE

4. 2. On the Extraction of Essential Oils by Supercritical Carbon Dioxide and its Influence on the Mesomorphic Phase Structures

   Author : José da Cruz Francisco; Kemiska institutionen; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Natural oils; fats and waxes technology; Naturliga oljor; fetter; vax; Kemiteknik och kemisk teknologi; Chemical technology and engineering; Livsmedelsteknik; Food and drink technology; phase behavior; soybean lecithin; monoolein; cineole; terpenes; eucalyptus; extraction; Essential oils; supercritical carbon dioxide;

   Abstract : A comparison of essential oils from leaves of Eucalyptus camaldulensis Dehn. obtained by hydrodistillation (HD) and supercritical carbon dioxide (SC-CO2) extraction is presented. Selected major components of the oils showed a predominance of higher molecular weight components in the SC-CO2 extracts than in those obtained by HD. READ MORE

5. 3. Analytical Supercritical Fluid Extraction of Lipid Containing Samples

   Author : Mattias Järemo; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; SFC; extraction cell; liquid samples; fat retainers; lipids; SFE; carbon dioxide; Analytical chemistry; Analytisk kemi;

   Abstract : Traditionally, sample work-up has been associated with different kinds of liquid extraction techniques involving a large consumption of hazardous solvents. There are today regulations that aims at replacement of dangerous chemicals which has created a need for new extraction techniques. READ MORE

6. 4. Thermodynamic Cycles using Carbon Dioxide as Working Fluid : CO2 transcritical power cycle study

   Author : Chen Yang; Lundqvist Per; Carlos Infante Ferreria; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : The interest in utilizing the energy in low‐grade heat sources and waste heat is increasing. There is an abundance of such heat sources, but their utilization today is insufficient, mainly due to the limitations of the conventional power cycles in such applications, such as low efficiency, bulky size or moisture at the expansion outlet (e.g. READ MORE

7. 5. Superhydrophobic coatings of wax and polymers sprayed from supercritical solutions

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

   Abstract : 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. READ MORE