118,788 research outputs found
Luigi e Maria Beltrame Quattrocchi La fecondità del sacramento vissuto
No full textIl contributo delinea l'impegno educativo nell'ambito della famiglia di Luigi e Maria Beltrame Quattrocchi
Kinetics and Byproducts of the Liquid-Phase Oxidation of Phenol to p-Benzoquinone Catalyzed by CuCl2
No full textOxidation of phenol was effected by O//2 at 35 kg/cm**2 in dimethylformamide (DMF), dimethyl sulfoxide (Me//2SO), and other solvents, containing variable amounts of CuCl//2 (0. 20-0. 50 mol/L), at temperatures in the range from 50 to 1110 degree C. Besides p-benzoquinone, considerable amounts of o- and p-chlorophenol were identified in the products, their yield strongly depending on the solvent. On the basis of overall conversion of phenol and of selectivity for p-benzoquinone, solvents of dipolar aprotic character, particularly DMF, were found convenient; ethylene glycol gave the poorest results. Kinetic coefficients were evaluated, within the pseudo-first-order approximation, for reactions in DMF and in Me//2SO. The steel surface of the autoclave was found to interfere with the reaction. After PTFE-lining, both rate and selectivity changes are observed
Selectivity of Toluene Disproportionation over Zeolite Catalysts
No full textThree decationated zeolites (H-Y, H-ZSM-5 and H-ZSM-11) were tested in different conditions. Selectivities (to xylenes, Sx, and to para-isomer, Sp) were evaluated, together with activity, vs. time-on-stream. H-ZSM-5 proved to be the best catalyst, showing Sx≃1 and Sp-values larger than for the equilibrium gaseous mixture
Il Mercure. Il relitto del brick del Regno Italico affondato nel 1812 nella battaglia di Grado
No full textKinetics of Biodegradation of Mixtures Containing 2,4-Dichlorophenol in a Continuous Stirred Reactor
No full textA solution containing 2,4-dichlorophenol (DCP) and phenol (or glucose), in the ratio 1:1 in terms of carbon, was fed to a completely mixed continuous flow reactor with recycle and controlled wasting of the activated sludge, operated at steady-state conditions at 20°C. A carefully adapted sludge was able to degrade DCP, besides the accompanying substrate, with no evidence of substrate inhibition in the concentration range covered (156 mg l-1 in the influent). The reactivity order was found to be glucose ≫ phenol > DCP. The results of a series of kinetic runs with phenol + DCP were interpreted by a first-order equation for phenol and by the Monod model for DCP
Kinetics of phenol degradation by activated sludge in a continuous-stirred reactor
No full textThe rate of phenol biodegradation by an adapted activated sludge was studied in a completely mixed, continuous-flow reactor with recycle and controlled wasting of the sludge, operated at steady-state conditions at 20.0°C. No substrate inhibition was evidenced in the concentration range covered (up to 360 mg phenol/l in the influent). The results of a series of kinetic runs at the highest influent substrate concentration were interpreted in the framework of the Monod model, obtaining the values of the kinetic parameters. The effect of different sludges and of a different influent concentration was checked. While the latter markedly affects the rate of phenol removal, the change of sludge with another one originally different but similarly adapted influences the kinetics to a lesser extent.
The rate of phenol biodegradation by an adapted activated sludge was studied in a completely mixed, continuous-flow reactor with recycle and controlled wasting of the sludge, operated at steady-state conditions at 20. 0 degree C. No substrate inhibition was evidenced in the concentration range covered (up to 360 mg phenol/l in the influent). The results of a series of kinetic runs at the highest influent substrate concentration were interpreted in the framework of the Monod model, obtaining the values of the kinetic parameters. The effect of different sludges and of a different influent concentration was checked
Kinetics of Phenol Degradation by Activated Sludge in a Continuous-Stirred Reactor
No full textThe rate of phenol biodegradation by an adapted activated sludge was studied in a completely mixed, continuous-flow reactor with recycle and controlled wasting of the sludge, operated at steady-state conditions at 20.0°C. No substrate inhibition was evidenced in the concentration range covered (up to 360 mg phenol/l in the influent). The results of a series of kinetic runs at the highest influent substrate concentration were interpreted in the framework of the Monod model, obtaining the values of the kinetic parameters. The effect of different sludges and of a different influent concentration was checked. While the latter markedly affects the rate of phenol removal, the change of sludge with another one originally different but similarly adapted influences the kinetics to a lesser extent
Kinetics of Biodegradation of Phenol and 2,4-Dichlorophenol in a Continuous Stirred Reactor
No full textIl Museo Nazionale di Archeologia del Mare di Caorle e la musealizzazione digitale del brick Mercurio
No full textpresentazione dell'allestimento digitale dedicato all'interno del Museo del Mare di Caorle dello scavo e dello studio del relitto del brick Mercurio e della Battaglia di Grado. Ci si sommerma in particolare sulle postazioni digitali quali realtà virtuale, proiezioni, modellazione 3D ecc
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