No abstract

The surface‐reactive injection moulding process is based on the reactive coupling between, e.g., a polyamine and polycarbonate (PC). The reaction takes place in a small layer and within a time of only about 1 μs before solidifying of the melt surface. Kinetic data are difficult to measure under those conditions. By model reactions in solution and in melt, first data on the reaction rate are available. Moulding experiments were made with a polyethylene imine (PEI), labelled with a naphthalimide dye. On injection of a PC melt, PEI layers of different thickness were transferred from the mould to the PC part surface. No significant residues remained on the mould surface. The thickness of the layer on PC was measured before and after solvent extraction. Conditions for best transfer and the maximum layer thickness are discussed. The electrostatic discharging behaviour of those layers on a PC part is shown.

This work presents a one-dimensional reactor model for a tubular reactor packed with a catalytically active foam packing with a pore density of 30 PPI in cocurrent upward flow in the example of hydrogenation reaction ofα-methylstyrene to cumene. This model includes material, enthalpy, and momentum balances as well as continuity equations. The model was solved within the parameter space applied for experimental studies under assumption of a bubbly flow. The method of orthogonal collocation on finite elements was applied. For isothermal and polytropic processes and steady state conditions, axial profiles for concentration, temperature, fluid velocities, pressure, and liquid holdup were computed and the conversions for various gas and liquid flow rates were validated with experimental results. The obtained results were also compared in terms of space time yield and catalytic activity with experimental results and stirred tank and also with random packed bed reactor. The comparison shows that the application of solid foams as reactor packing is advantageous compared to the monolithic honeycombs and random packed beds.