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Chemical and Process Engineering (double degree)
Doctoral Programme,
Faculty of Chemical Engineering
Joint study programme with foreign universities - two diplomas for one study.
The PhD study programme Chemical and Process Engineering aims on the education of experts with a wide range of knowledge and skills for both academic and industrial applications. The students learn in detail theoretical basis of chemical and process engineering, bio-engineering and material engineering as well as experimental and practical aspects of the field. This will create prerequisites for their further career in the basic or applied research in chemical and process engineering but also in the related areas, such as material engineering, bio engineering and informatics. CareersGraduates of this study programme gain the expertise in transport phenomena, thermodynamics, reaction engineering, continuum fluid mechanics, material engineering and chemical-engineering aspects of environmental protection. Specialized knowledge includes applied informatics, mathematical modeling, numerical methods, non-linear dynamics and programming for scientific and technical computations. The graduates find jobs in applied research and development in chemical, pharmaceutical, bio-engineering and advanced material industry, including management of the research and development. The graduates are also successful in academic work at technical universities, research institutes and academies of sciences. Programme Details
Ph.D. topics for study year 2021/22KLa - shear stress coupling to design fermenters better
AnnotationIn fermentation technologies, mechanically agitated aerated vessels are frequently used. In cases of aerobic fermentations, the Oxygen Uptake Rate - OUR is frequently used as the important design parameter. This means that the gas-liquid mass transfer controlled process is considered and the volumetric mass transfer coefficient - kLa is taken as the most important parameter. The practice shows, however, that the impellers with lower Power number (which means lower turbulence intensity and lower kLa) often ensure higher bioprocess efficiency than those with high Power number (which means higher turbulence intensity and higher kLa). The explanation is brought by the fact that microorganisms/biomass might be damaged by the high turbulence intensity as explained further. The turbulence intensity is proportional to shear stresses occuring in the mechanically agitated fermentation batch. A high shear stress may "cut" the microorganisms, which stop producing their primary product then. The aim of the PhD thesis is to measure the quantities proportional to shear stress values at the process conditions of aerobic fermentations and couple them with the kLa values, which are already at disposal in the Mass Transfer Lab database at UCT Prague. This data coupling will enable to develope the highly efficient industrial fermenters design tool.
Contact supervisor
Study place:
Department of Chemical Engineering, FCE, VŠCHT Praha
Gas - Liquid Mass Transfer. Experimental comparison of various apparatuses performance.
AnnotationThe volumetric mass transfer coefficient (kLa) plays a crucial role in industrial design in the case of the process controlled by gas–liquid mass transfer. Prediction of kLa is nowadays mostly based on literature correlations. Our research goal is to establish suitable kLa correlations for different types of devices that would be based on the experimental dataset. The PhD thesis aim at the comparison of various gas-liquid contactor types from the viewpoint of their mass transfer efficiency. The suitable correlations will be developed that would be viable for mechanically agitated gas–liquid contactors and also for pneumatically agitated gas–liquid contactors such as airlift reactor.
Contact supervisor
Study place:
Department of Chemical Engineering, FCE, VŠCHT Praha
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Updated: 9.2.2024 12:34, Author: Jan Kříž