Sökning: "Cooling crystallization"

Visar resultat 11 - 15 av 27 avhandlingar innehållade orden Cooling crystallization.

1. 11. Recovery of Scandium using Antisolvent Crystallization in the Valorization of Scandium-containing Waste Streams

   Författare :Edward Peters; Kerstin Forsberg; Michael Svärd; Jens-Petter Andreassen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Antisolvent crystallization; ammonium scandium hexafluoride; ammonium metal fluorides; phase equilibria; solubility; supersaturation; seeding; agitation mechanism; crystal size distribution; morphology; Chemical Engineering; Kemiteknik;

   Sammanfattning : Scandium is widely dispersed in the earth’s crust and is rarely concentrated in ores, and a viable option to guarantee a secure supply of scandium is to recover the metal from waste streams of other mining and metallurgical facilities. The valorization of such streams to recover metals of value is a prerequisite to alleviate the global shortages of scandium and other rare earth elements. LÄS MER

3. 12. Solubility and polymorphism of molecular compounds

   Författare :Sandra Gracin; Åke C. Rasmuson; David J. W. Grant; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; solubility; prediction of solubility; UNIFAC; activity coefficients; activity of the solid phase; polymorphism; controlled crystallization; sonication.; Kemiteknik; Chemical engineering; Kemiteknik;

   Sammanfattning : This thesis deals with the controlled crystallization of small organic molecules and is focused on solubility and polymorphism. The solubility was determined for phenylacetic acid, p-hydroxyphenylacetic acid, p-aminophenylacetic acid, p-hydroxybenzoic acid and ibuprofen in both water and in a range of organic solvents. LÄS MER

4. 13. Solid-liquid Phase Equilibria and Crystallization of Disubstituted Benzene Derivatives

   Författare :Fredrik Nordström; Åke Rasmuson; Gerard Coquerel; KTH; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

5. 14. Origin and composition of the Hällefors composite dyke, central Sweden

   Författare :Ricardo Lopez-Montano; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The Hällefors dyke is a large, wedge-shaped high-level intrusion that trends E-W and has a subvertical dip, the overall dimensions being about 42 km in length and 1 km in width. It was emplaced ca 1550 Ma ago in gneisses of the Svecokarelian (1950-1750 Ma) orogenic belt in south central Sweden. LÄS MER

7. 15. Residual Stresses and Strains in Cross-linked Polyethylene Power Cable Insulation

   Författare :Lorant Olasz; Peter Gudmundson; Ulf Stigh; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Other engineering mechanics; Övrig teknisk mekanik;

   Sammanfattning : The subject of this thesis is modeling of the manufacturing process of high voltage power cables with the aim of predicting residual stresses and strains in the cable insulation. The studied material is cross-linked polyethylene (XLPE), which at room temperature is a semi-crystalline viscoelastic solid. LÄS MER