Sökning: "alkali extraction"

Visar resultat 16 - 20 av 30 avhandlingar innehållade orden alkali extraction.

1. 16. Bioprocessing, Structure and Material Properties of Arabinoxylans

   Författare :Anders Höije; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; moisture content; biorefinery; Arabinoxylan; mechanical properties; chemical structure; isolation; film formation; oxygen permeability; enzymatic treatment;

   Sammanfattning : This work has focused on using agriculture residues as raw material for new polymeric materials. Arabinoxylans have been isolated from barley husks and endosperm fiber using alkali extraction, and the chemical composition and detailed structure have been determined. LÄS MER

3. 17. Remediation of mercury polluted soil

   Författare :Thomas Lifvergren; Bert Allard; Örebro universitet; []
   Nyckelord :soil pollution; soil remediaion; mercury; NATURAL SCIENCES; NATURVETENSKAP; Enviromental Science; Miljövetenskap;

   Sammanfattning : Mercury in contaminated soil constitutes a wide spectrum of species with highly different properties due to the chemical complexity of the element. Assessments of risk, ecological effects and removal potential require process and mobility studies. LÄS MER

4. 18. The influence of high temperature on the discoloration and degradation of carbohydrates and on hydrogen peroxide bleaching of spruce TMP

   Författare :Louise Logenius; Hans Höglund; Roland Agnemo; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Temperature; metal ions; cellulose; glucuronic acid; UV-Vis spectroscopy; spruce; TMP; hydrogen peroxide bleaching; spectroscopy; optical properties; Chemical engineering; Kemiteknik;

   Sammanfattning : When processing wood to obtain pulp, the fibers are subjected to high temperatureat moisture levels and to the influence of metal ions. Many process developmentshave resulted in utilization of higher temperatures that induce chemical reactionsin the wood fibers. This thesis deals with some aspects of using high temperaturesin pulping processes. LÄS MER

5. 19. Fermentation of Lignocellulosic Hydrolysates: Inhibition and Detoxification

   Författare :Eva Palmqvist; Biologiska institutionen; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fermentation strategies; mechanisms; identification; inhibition; lignocellulosic hydrolysates; Ethanol; Saccharomyces cerevisiae; virology; virologi; mykologi; mycology; Mikrobiologi; bakteriologi; bacteriology; Microbiology;

   Sammanfattning : The ethanol yield and productivity obtained during fermentation of lignocellulosic hydrolysates is decreased due to the presence of inhibiting compounds, such as weak acids, furans and phenolic compounds produced during hydrolysis. Evaluation of the effect of various biological, physical and chemical detoxification treatments by fermentation assays using Saccharomyces cerevisiae was used to characterise inhibitors. LÄS MER

7. 20. Electroremediation of contaminated soil

   Författare :Pascal Suèr; Bert Allard; Lisbeth M. Ottosen; Örebro universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electrokinetic remediation; contaminated soil; mercury; heavy metals; organic compounds; Chemistry; Kemi; Enviromental Science; Miljövetenskap;

   Sammanfattning : Electroremediation was applied to contaminated soils in order to study the transport of metals and organic compounds by the external electric field. The electric field caused acidic conditions near the anode, so that copper, zinc, lead, nickel, cadmium, calcium and manganese were released from soil from a chlor-alkali site. LÄS MER