01461nas a2200229   4500008004100000022001400041245008000055210006900135260006700204300001000271490000700281520065600288653002600944653003400970653001101004653002001015653002501035100001801060700002201078700001801100856011301118       2013                        eng d  a0008-403400aCrystallisation of ferrous sulphate heptahydrate: experiments and modelling0 aCrystallisation of ferrous sulphate heptahydrate experiments and  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcJAN  a47-530 v913 a<p>Crystallisation is an industrially important unit operation for purifying and separating chemical mixtures. A generic crystallisation modelling framework has been implemented in the general process modelling system (gPROMS) software (of PSE, UK). This framework can be used to model the batch cooling crystallisation of ferrous sulphate heptahydrate (FSH). The parameter estimation and sensitivity of the predicted results with various numerical parameters was studied for batch crystalliser. An Excel front-end to the gPROMS model was developed to facilitate the interactive use of the model. (c) 2011 Canadian Society for Chemical Engineering</p>10abatch crystallisation10aferrous sulphate heptahydrate10agPROMS10aMSExcel-linking10aparameter estimation1 aShaikh, Latif1 aPandit, Aniruddha1 aRanade, Vivek  uhttps://library.ncl.res.in/content/crystallisation-ferrous-sulphate-heptahydrate-experiments-and-modelling-002108nas a2200169   4500008004100000022001400041245011900055210006900174260000900243300001400252490000600266520148100272100001901753700001701772700001801789856013101807       2022                        eng d  a2058-988300aCharacterization of axial dispersion in a vertical helical coil for gas-liquid-liquid flow at low Reynolds numbers0 aCharacterization of axial dispersion in a vertical helical coil   cMAY   a1083-10950 v73 a<p>
	Gas-liquid-liquid (GLL) slug flow reactors offer several advantages like higher interfacial area, excellent mass transfer, and lower backmixing. Mesoscale (diameter similar to a few mm) helical coiled reactors operating in a slug flow regime can be used as GLL reactors even for reactions with long residence times. The long residence time invariably leads to low Reynolds number flows, which makes the backmixing or axial dispersion an important parameter influencing reactor performance. In this work, we have characterized the residence time distribution (RTD) and axial dispersion for single, gas-liquid, liquid-liquid, and gas-liquid-liquid flows through a vertical helical coil. Slow flows with low Reynolds numbers (&lt;100) were considered. RTD measurements were carried out with a step input and the outlet concentration was tracked by measuring light absorbance using a spectrophotometer. The applicability of the axial dispersion model was examined and verified for the studied systems. The axial dispersion was quantified in terms of dispersion coefficients. A significant reduction in the axial dispersion was observed by virtue of multiphase operation, in the order single &gt; gas-liquid &gt; liquid-liquid &gt; gas-liquid-liquid flow. This characterization of backmixing for multiphase flows in curved geometries will be helpful in the optimization of slow reactions in flow and also for processes like nanoparticle synthesis, crystallization, etc.</p>
1 aKhan, Muzammil1 aJoshi, Sunil1 aRanade, Vivek  uhttps://library.ncl.res.in/content/characterization-axial-dispersion-vertical-helical-coil-gas-liquid-liquid-flow-low-reynolds