1,721,048 research outputs found
Risanamento Chimico dei suoli
No full textSi sono studiati processi di estrazione del clorobenzene da suoli in diverse miscele estraenti valutando l'efficienza di estrazione in funzione delle condizioni operative. Successivamente si sono effettuate prove di idrodeclorazione catalitica (HDCl) su diversi composti clorurati sia alifatici che aromatici e sia monoclorurati che policlorurati. I composti testati sono: clorobenzene (aromatico monoclorurato), esacloroetano (alifatico policlorurato) e esaclorobenzene (aromatico policlorurato). Si è utilizzato un catalizzatore che ha come elemento attivo il palladio supportato su carbone attivo (C/Pd Escat 11; 5% Pd; Engelhard). Le prove sperimentali sono state condotte in un reattore in vetro di capacità 1.5 L, termostato e strumentato con agitatore meccanico e misuratore di pressione. Si sono valutate le costanti cinetiche del processo e la possibilità di riutilizzare la fase estraente
Catalytic hydrotreating of 2,4’-DDT and 4,4’-DDT
No full textExperimental results of catalytic hydrotreating of a commercial mixture of DDT were reported. Kinetic analysis of HDCL reactions was performed. Reaction network was identified and kinetic constants were evaluated in the range of temperature 180-230 °C. Destructuion and removal efficiency of HDCl process was evaluated. A commercial Ni-Mo catalyst was adopted
Moto relativo di gas e liquido. Nota II - Flusso in equicorrente ascendente entro tubi verticali.
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Reaction Network and Kinetics of the Pyrolysis of Tetralin/Naphthalene Mixtures in Nitrogen and Hydrogen Atmospheres
No full textMoto relativo di gas e liquido. Nota II - Flusso in equicorrente ascendente entro tubi verticali.
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Diffusional kinetics in the catalytic hydrodechlorination of chlorobenzene in multiphase aqueous mixtures
No full textThe catalytic hydrodechlorination of aqueous mixtures of monochlorobenzene has been investigated experimentally and theoretically. The reaction runs were conducted in a stirred autoclave at T=30 °C, in the presence of pure hydrogen at pressures (kept constant during each reaction run) in the range 2≤pH2≤60 bar, and using a Pd/C catalyst. Chlorobenzene was loaded in excess with respect to its solubility in water. Therefore, the reacting process involves four phases: (i) gaseous hydrogen; (ii) aqueous solution of monochlorobenzene and hydrogen; (iii) oily droplets of undissolved chlorobenzene; (iv) catalyst solid particles. The theoretical analysis for modelling the overall reactive process has been based on the general results and methods of transport phenomena and of kinetics of heterogeneous catalytic reactions. The experimental data, interpreted in the light of the theoretical model, permit to gain an insight into the Langmuir–Hinshelwood mechanism of the reaction: hydrogen is adsorbed according to a Langmuir-type dissociative adsorption and the rate determining step is the surface reaction. According to this mechanism the reaction rate has a fractional order with respect to hydrogen
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