Projektfinanzierung Institut fuer Angewandte Chemie Berlin-Adlershof e.V. Schlussbericht

SIGLEAvailable from TIB Hannover: F03B491 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany); Senatsverwaltung fuer Wissenschaft, Forschung und Kultur, Berlin (Germany)DEGerman

Measurement of residence time distributions in a continuously operated spouted bed

Continuous gas-solid processes are applied in many industries with particulate products, e.g. for granulation or coating. In this contribution, the residence time behavior in a continuously operated prismatic spouted bed was determined by applying an impulse of magnetizable tracer particles. Experiments were performed with the original configuration and with separation plates including mouse holes of varying size between the different chambers of the ProCell 25 apparatus. It is shown that the shape of the residence time distribution is influenced by the separation plates. In order to quantify the backmixing between the chambers, discontinuous experiments were performed, and the bed mass distribution and the distribution of the tracer were measured and compared to the initial conditions

SELECTIVE OXIDATION OF O-XYLENE TO PHTHALIC-ANHYDRIDE OVER THE EUROCAT V2O5/TIO2 CATALYSTS

The selective oxidation of o-xylene to phthalic anhydride has been studied in four laboratories, using catalysts EL10V1 and EL10V8; conversions and product yields as a function of time-on-stream are reported. The results obtained are in generally good agreement: for both catalysts, phthalic anhydride yields at 40% conversion are ca. 20%, rising to 63-70% at 100% conversion. Increasing the vanadium content from 1 to 8% has little effect and may even result in a slightly worse performance. Differences in the temperatures required to attain a fixed conversion may reflect differences in reactor design, especially with regard to heat exchange efficiency