Search for dissertations about: "Microwave-assisted extraction"

Showing result 1 - 5 of 8 swedish dissertations containing the words Microwave-assisted extraction.

2. 1. Recent Extraction Techniques with Emphasis on Supercritical Fluid Extraction and Microwave-assisted Extraction

   Author : Cecilia Sparr Eskilsson; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytisk kemi; Analytical chemistry; Pressurized hot water extraction; Pressurized liquid extraction; Microwave-assisted extraction; Recent extraction techniques; Supercritical fluid extraction;

   Abstract : Today’s requirements of fast, reliable and selective analytical methods with minimal usage of organic solvents have accelerated the development of new, automated extraction techniques. In this thesis recent extraction techniques with emphasis on supercritical fluid extraction (SFE) and microwave-assisted extraction (MAE) were investigated. READ MORE

4. 2. Microwave-assisted transformations of lignin for value-added material applications

   Author : Jenevieve G. Yao; Minna Hakkarainen; Karin Odelius; Monika Österberg; KTH; []
   Keywords : lignin; microwave-assisted processes; organosolv fractionation; esterification; fused filament fabrication; digital light processing; lignin; mikrovågsassisterade strategier; organosolv-fraktionering; förestring; additiv tillverkning; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Abstract : The chemical diversity and structural complexity of lignin, an abundant biopolymer found in vascular plants, present a multitude of opportunities for the modification and fine-tuning of its properties to suit downstream demands. In this thesis, microwave-assisted strategies were explored as efficient and environment-friendly pathways for lignin valorization towards value-added material applications. READ MORE

5. 3. Chromatography and extraction techniques for new evaluation methods of polyolefins long-term performance

   Author : Lina Burman; Ann-Christine Albertsson; Marek Kowalczuk; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; polymer; chromatographic fingerprinting; gas-chromatography – mass spectrometry; GC-MS; degradable polyethylene; prooxidant systems; chemiluminescence; oxidation; degradation mechanisms; accelerated ageing; antioxidants; transformation products; microwave assisted extraction; MAE; solid-phase microextraction; SPME; volatiles; solid phase extraction; SPE; Kemiteknik; Chemical engineering; Kemiteknik;

   Abstract : Chromatography and extraction techniques, and also chemiluminescence have been utilized to develop new rapid and informative tools in the evaluation of long-term properties and environmental effects of polymeric materials. Methods were developed for classification of materials and for early and rapid degradation detection. READ MORE

6. 4. Determination of Banned Azo Dyes in Leather

   Author : Lars-Henric Ahlström; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytisk kemi; Analytical chemistry; extraction; azo dyes; aromatic amines;

   Abstract : Dyes are commercially indispensable and the expanding industry offers a complete palette of colors. Azo dyes constitute the largest chemical class of synthetic dyes because of their versatility, low price, and ease of production. READ MORE

7. 5. Development of dynamic microwave and sonication-assisted extraction techniques coupled on-line to gas chromatography

   Author : Magnus Ericsson; Tuulia Hyötyläinen; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : This thesis describes the evaluation and construction of two solvent extraction methods for solid samples. The techniques are called Dynamic microwaveassisted extraction (I-III) and Dynamic sonication-assisted solvent extraction (IV-V). Both techniques are based on dynamic solvent extraction and are performed at elevated temperatures and pressures. READ MORE