In this work an ultrafast electron beam X-ray modality was applied for the first time to characterize the gas-liquid Taylor flow inside each channel of an opaque honeycomb monolith structure (65 cpsi) for u G;S 50:1 . . . 0:5 m=s and u L;S 50:2 m=s. Significant spatial and temporal deviations in the phase holdup as well as in the gas bubble and liquid slug lengths were found. To evaluate the impact of Taylor flow maldistribution on the reactor performance, the data of more than 125; 000 unit cells were used to simulate the reactor productivity in the hydrogenation of glucose. The results verify that a monolith reactor solely designed by using superficial velocities and empirical correlations for gas bubble and liquid slug lengths fails significantly in achieving high product selectivity and the desired conversion. The developed methods are a solid base to design and select proper distributors ensuring the favorable flow configurations for specific chemical processes.

e kinetics of the adsorption of dye molecules on membrane filters made of cellulose nitrate have been studied. In order to obtain thermodynamical data the temperature has been varied from 283 K to 333 K. Because kinetic laws of 1. or 2. order cannot describe the experimental results two different theories were applied. In addition to a classical concept a new equation based on the fractal theory has been checked and has proved to be suitable for adsorption data. We have shown that obtained fractal parameters, fractal dimension Ds and fractal dimension Df, are in excellent agreement with other fractal kinetics experiments.

The electronic energy transfer from rhodamine B to several acceptor dyes in cellulose nitrate solid solution and on the surface of membrane filters of the same polymer has been investigated at room temperature. In polymer matrix the Forster theory has been confirmed and critical distances Ro have been calculated from the theoretical equation and have also been determined by energy transfer experiments measuring the fluorescence decay time of the donor. Applying new fractal concepts to energy transfer in porous membranes, the fractal dimension of the polymer surface has been determined under several conditions. The values agree with others obtained by adsorption experiments.