02242nas a2200217   4500008004100000022001400041245010900055210006900164260006900233300001200302490000800314520138400322653001801706653003101724653003301755653002501788653002801813653003001841100002501871856012801896       2008                        eng d  a1385-894700aGeneral model for analyzing data on the rate of reactive dissolution of poly-disperse particulate solids0 aGeneral model for analyzing data on the rate of reactive dissolu  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAPR  a347-3600 v1373 a<p>A model has been presented which successfully simulates the experimentally observed integral batch reactive dissolution rate data while accounting for the poly-dispersity of the solid particulate charge. This allowed avoiding arbitrary assumptions about the particulate inventory and size independence of the mass transfer coefficient. There is also no need for a priori identification of the controlling regime, which can change from kinetic to mass transfer during the process, apart from the possibility of the shift with the specified process and operating conditions. The model was applied with equal ease to a simple isothermal reaction, an exothermic reaction with runaway potential and to a phase-transfer catalysis reaction with a complex mechanism. The model was shown to predict the time required for a specified extent of conversion of the particulate reactant or the rate of consumption of a key liquid reactant under a variety of process and operating conditions, like temperature, liquid reactant and the catalyst concentration, particle size, poly-dispersity of the charge and agitation speed. Such information is useful in reactor design and scale-up. Where dissolution is accompanied with a runaway reaction, the model can predict quantities of interest in hazard assessment and should aid safe reactor design. (c) 2007 Elsevier B.V. All rights reserved.</p>10akinetic model10aparticle size distribution10apoly-disperse solid reactant10areactive dissolution10areactive thermal hazard10asolid-liquid PTC reaction1 aBhattacharya, Arijit  uhttp://library.ncl.res.in/content/general-model-analyzing-data-rate-reactive-dissolution-poly-disperse-particulate-solids-002040nas a2200205   4500008004100000022001400041245006000055210006000115260006900175300001200244490000800256520132300264653003601587653002101623653002701644653001801671653003001689100002501719856009001744       2008                        eng d  a1385-894700aKinetic modeling of liquid phase autoxidation of cumene0 aKinetic modeling of liquid phase autoxidation of cumene  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAPR  a308-3190 v1373 a<p>A new kinetic model for the liquid phase autoxidation of cumene has been developed utilizing the existing knowledge about the traditional free-radical mechanism involving the initiation of the free-radicals, the chain propagation and transfer and the various modes of radical termination. Unlike previous work, in the re-organized reaction network an important cross-termination step replaces an often used but less likely one and a new derivation of the rate model has been provided. A base set of rate parameters for the elementary steps within this reaction network were chosen, many of them were same or very similar to those published in the literature, with a few critical ones re-estimated for correct match with directly observed kinetic data reported in the literature on cumene oxidation in bench scale reactors. Embedding this kinetic sub-model within a simple reaction engineering model for a single air-sparged continuous cumene oxidator, the liquid oxidate composition at the reactor exit could be predicted that compared closely with some limited published data from an industrial reactor. It is hoped that the kinetic model presented here would be a useful tool in the analysis and design of other autoxidation reactors as well with minor adaptations. (c) 2007 Elsevier B.V. All rights reserved.</p>10aair-sparged continuous oxidator10acumene oxidation10afree-radical mechanism10akinetic model10aliquid phase autoxidation1 aBhattacharya, Arijit  uhttp://library.ncl.res.in/content/kinetic-modeling-liquid-phase-autoxidation-cumene-0