SVIBOR - Project code: 4-07-017


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


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Project code: 4-07-017


Main researcher: KURTANJEK, ŽELIMIR (24881)

Type of research: basic
Duration from: 01/01/91. to 12/30/95.

Papers on project (total): 19
Papers on project quoted in Current Contents: 6
Institution name: Prehrambeno-biotehnološki fakultet, Zagreb (58)
Department/Institute: Department for Process Engineering
Address: Pierottijeva 6, 41 000 Zagreb, CROATIA
City: 10000 - Zagreb, Croatia
Fax: 385 (0)41 418 230
Phone: 385 (0)41 440 463

Summary: The project is aimed at investigation of measurement, mathematical modelling and computer control of nonstationary states in process engineering ( chemical, biochemical and food engineering ). In the field of chemical engineering is studied dynamical behavior of CO oxidation on Pt catalyst which exhibits appearance of limit cycles, surface waves and chaotic states. Nonsteady dynamics of biochemical reactors is studied by application of models derived from microorganism metabolism and by use of input/output models with artificial neural networks. For study of adaptive control of bioreactors is investigated use of Kalman algorithm for estimation of unmeasured biological variables. A part of the project is devoted to study of nonstationary transition occurring during freezing and thawing of myobilar proteins from pilchards ( surimi ). Investigated are thermophysical parameters, nonsteady heat transfer, enthalpy and efficacy of various cryoprotectors. In food process engineering is studied dynamics of solid/solid mixing process in mechanical mixers. This study is aimed to application in chemical, food and pharmaceutical industry.

Keywords: mathematical modelling, optimal control, state and parameter estimation, artificial neural network, limit cycle, CO oxidation, platinum Pt, cultivation of baker's yeast, heat transfer, thermophysical parameters, enthalpy, differential thermal analysis DTA, freezing, proteins ( surimi ), solid/solid mixing

Research goals: Aim of this project is to develop measurement methods, mathematical and computer models and apply theory of control of dynamic system in process engineering ( chemical, biochemical and food engineering ). The investigations have emphasis on study of dynamic properties of nonlinear systems. The study of nonstationary features in chemical catalytic reaction systems will give better understanding of catalytic mechanism and provide basis for control of such processes with improved selectivity and productivity unattainable with classical steady state control. Analysis of unsteady phenomena of bioreactors has an outstanding importance in biotechnology. Mathematical modelling of intracellular states in relation to processes of energy and momentum transfer in abiotic phase is expected to contribute to theoretical development of bioreactor control. Artificial neural networks are studied in the context of bioreactor identification and control. Investigated are different network structures and adaptation algorithms. The results are aimed to application in industrial production of baker's yeast. A part of the study is devoted to nonsteady responses of myofibilar proteins from pilchards (surimi) during freezing. The goal is to quantify cryoprotector activity of different additives used in the production. A part of the project deals with study of dynamics of solid/solid mixing enabling elucidation of complex interaction between momentum transfer and physical and chemical properties of solids. The results will lead to improvement of quality of various products in food and pharmaceutical industry.


  1. Name of institution: Chemical Engineering Department, The University of Houston
    Type of institution: Economical/Production
    City: 77204-4792 - Houston, TEXAS, USA

  2. Name of institution: Department of Bioresorce Engineering, Oregon State University
    Type of institution: Economical/Production
    City: 97331-3906 - Corvallis, OREGON, USA

  3. Name of institution: Department of Biology and Biomedical Sciences, The University of Ulster at Coleraine
    Type of institution: Economical/Production
    City: BT52 1SA - Coleraine, England/ N. Ireland

  4. Name of institution: Food Refrigeration and Process Engineering Research Centre, University of Bristol
    Type of institution: University/Faculty
    City: BS18 7DY - Langford/Bristol, England

  5. Name of institution: Pliva/ Institut / Tvornica kvasca
    Type of institution: State institute
    City: 10000 - Zagreb, Croatia

  6. Name of institution: PODRAVKA / Tvornica kvasca
    Type of institution: State institute
    City: 48300 - Koprivnica, Croatia


  1. Name: Konstrukcija mjernog uređaja za diferencijalnu termičku analizu s on-line međusklopom za PC računalo i softwareom za određivanje entalpije
    Type of achievement: Instrumentation
    Authors: Želimir Kurtanjek

  2. Name: Mjerni uređaj s međusklopom za PC računalo i software za impulsnu metodu s linijskim izvorom za određivanje koeficijenta toplinske vodljivosti prehrambenih proizvoda
    Type of achievement: Instrumentation
    Authors: Želimir Kurtanjel

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Last update: 02/16/94