Projects / Programmes source: ARIS

I. Extraction processes

Research activity

Code Science Field Subfield
2.02.00  Engineering sciences and technologies  Chemical engineering   

Code Science Field
T350  Technological sciences  Chemical technology and engineering 
T490  Technological sciences  Biotechnology 
Evaluation (rules)
source: COBISS
Researchers (8)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  17030  PhD Klementina Fukne-Kokot  Engineering sciences and technologies  Researcher  2001 - 2003  25 
2.  02619  PhD Željko Knez  Engineering sciences and technologies  Head  2001 - 2003  1,999 
3.  18235  Igor Krmelj    Researcher  2001 - 2003 
4.  00534  PhD Maja Leitgeb  Engineering sciences and technologies  Researcher  2001 - 2003  801 
5.  13568  PhD Zoran Novak  Engineering sciences and technologies  Researcher  2001 - 2003  236 
6.  21460  PhD Mateja Primožič  Engineering sciences and technologies  Researcher  2001 - 2003  340 
7.  12659  PhD Marjana Simonič  Engineering sciences and technologies  Researcher  2001 - 2003  558 
8.  11865  PhD Mojca Škerget  Engineering sciences and technologies  Researcher  2001 - 2003  744 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0794  University of Maribor, Faculty of Chemistry and Chemical Engineering  Maribor  5089638012  12,498 
I. Extraction processes – Extraction solid-SCF in liquid SCF: We have determined a new type of S-L-G phase transition. Our research programme was oriented towards: 1. The determination of high-pressure equilibrium data of solids and liquids in liquid and supercritical gasses with a static-analytic and/or dynamic method. With regard to P-T-x projections, we have determined areas of total mixing between the compressed media and solute; 2. The evaluation of thermodynamic correlations of solubility data, which are based on the density correlation or equation of state in binary and ternary systems; 3. The extraction processes in systems solid-sub- or supercritical fluid and the development of complete separation technologies. With regard to the already developed knowledge, rosemary extracts are being produced in industrial scale. I. High-pressure micronisation – PGSS. With the developed technique – PGSS (Particle from Gas Saturated Solutions) we have obtained small particles of substances, which are thermally labile and liable to oxidation processes. Research was oriented towards the following: 1. Theoretical and experimental studies of thermodynamic properties of systems for high-pressure micronisation (EP 0744 922). 2. We have performed studies of phase equilibria of systems solid-gas in liquid gas. We have determined S-L-G curves of different systems dependent on pressure, gas type and the melt of the substance under investigation. Research of the influence of thermodynamic parameters and fluids dynamic parameters on the particle size and their distribution. 3. With the lab-scale equipment for micronisation, we have researched the influence of different process parameters (pre- and after expansion pressure, pre- and after expansion temperature, type of compressible media, nozzle type and the solubility of compressible media in the substance) on the particle size and their size distribution. II. Supercritical fluids as reaction media: We have experimentally determined the influence of process parameters on the enzyme synthesis of fatty acid esters in supercritical CO2. Further research has been oriented towards the study of the use of other gasses of high density (butane, propane) as reaction media for bioreactions. - The ractions were performed in batch high-pressure mixing reactor, where we have determined optimal process parameters, reaction kinetics and thermodynamic properties. - The gained experimental data were used for performing the enzyme-catalyzed synthesis in the high-pressure continuous reactor, which is from the industrial-use point of view of first importance. - At the same time, we have studied the possibility of integrating the synthesis and separation processes, which includes also experimental determinations of phase equilibria in SC systems.
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