Area of research:
Diploma & Master Thesis
The position is suitable for part-time employment.
The condensation reaction of polysaccharides is a reversible reaction that can be conducted with a high yield and selectivity in micro reactors at high temperatures. By removing water from the reaction mixture, the equilibrium of the reaction can be shifted towards higher condensation grades of polysaccharides.
Within a technology transfer project in cooperation with an international industry partner, the development of a novel membrane technology for the continuous removal of water during the reaction is pursued. This may allow performing the reaction in one step, reduce further equipment and increase the energy efficiency of the process
The water should be separated in gaseous state through the pores. Due to the required high temperature conditions, porous metallic membranes are considered. The main challenge here is on the one hand the high surface energy of metallic membranes (hydrophilic behaviour) and on the other hand the surface tension of the reaction fluid and its temperature and pressure dependence. These facts lead to the wetting of the pores even for low pressure differences between feed and permeate side of the membrane. By means of specific hydrophobic coatings, the liquid penetration can be prevented. The aim of this work is to produce and characterize hydrophobic coatings for metallic membranes.
The individual tasks include:
Determination and evaluation of suitable coating materials based on a literature study.Production of coatings by means of the Plasma Enhanced –Chemical Vapour Deposition PE-CVD process.Characterisation of the coatings: analysis of the coating at the inner surface of the pores by SEM, determination of the contact angle, determination of coating thickness, etc.