01983nas a2200241 4500008004100000022001400041245012100055210006900176260000900245300000800254490000700262520111400269653001301383653002301396653002801419653003001447653002701477100002901504700002001533700002501553700003101578856013201609 2022 eng d a0250-470700aMgB2/NaNO2-PVA free-standing polymer composite film as a green firework: a step towards environmental sustainability0 aMgB2NaNO2PVA freestanding polymer composite film as a green fire cSEP  a1750 v453 a

We have demonstrated a simple fabrication methodology of free-standing polymer composite film firework that sparkles, provides colour display and moderate sound, yet is less polluting. The polymer composite film fireworks are composed of magnesium boride (MgB2), sodium nitrite (NaNO2) and poly(vinyl alcohol) (PVA). This study also suggested that a flammable, explosive powder composition can be made of two very common inorganic precursors, mainly NaNO2 and MgB2 . This is the first report demonstrating composite film fireworks with new flammable composition using metal boride as a primary precursor, which can also be used in conventional fireworks fabrication, replacing the traditional fuel, mainly gunpowder. The film fireworks were free from charcoal, sulphur, metal powder and paper. Therefore, they substantially lower the odour and COx, NOx, emissions and minimize the substantial trash generated when burned. Most importantly, film firework's minimum ignition temperature and exothermic decomposition temperature are much higher than the ambient temperature; hence are safe to handle.

10aFirework10afree-standing film10amagnesium boride (MgB2)10apoly(vinyl alcohol) (PVA)10asodium nitrite (NaNO2)1 aJeyavani, Vijayakrishnan1 aKumar, Rajendra1 aJoy, Pattayil, Alias1 aMukherjee, Shatabdi, Porel uhttps://library.ncl.res.in/content/mgb2nano2-pva-free-standing-polymer-composite-film-green-firework-step-towards-environmental01778nas a2200217 4500008004100000022001400041245016400055210006900219260000800288300001200296490000700308520098600315653002101301653001501322653001301337653002501350653001001375100002001385700002601405856012901431 2022 eng d a0208-642500aUse of isoperibolic reaction calorimeter for the study of reaction kinetics of acetic anhydride hydrolysis reaction: effect of acetic anhydride and water ratio0 aUse of isoperibolic reaction calorimeter for the study of reacti cDEC a255-2640 v433 a

Reaction kinetics of acetic anhydride hydrolysis reaction is being studied at a fixed reaction temperature and ambient pressure using an isoperibolic reaction calorimeter. Temperature versus time data along with heat and mass balance is used to determine the kinetics parameters i.e. activation energy and Arrhenius coefficient. It has been studied with the varying volumetric ratio of acetic anhydride and water; and kinetics parameters were compared and plotted for each ratio. Such a study has not been done previously to determine the kinetics dependency on varying the acetic anhydride water ratio. As the acetic anhydride hydrolysis reaction is exothermic in nature, the present study will help to decide the safe and suitable operating conditions such as concentration and temperature for conducting this reaction at plant scale. The kinetic data presented can be used further for the mathematical modeling and simulation of such exothermic hydrolysis reactions.

10aacetic anhydride10aHydrolysis10akinetics10areaction calorimeter10aWater1 aKumar, Rajendra1 aTiwari, Anurag, Kumar uhttps://library.ncl.res.in/content/use-isoperibolic-reaction-calorimeter-study-reaction-kinetics-acetic-anhydride-hydrolysis02178nas a2200253 4500008004100000022001400041245016500055210006900220260000800289300001200297490000700309520127200316653002101588653001401609653001801623653001701641653002301658653002501681100002001706700002101726700002501747700002101772856013101793 2025 eng d a1066-852700aA detailed study on heat of reaction and heat rate determination of nitrobenzene hydrogenation to aniline reaction using power compensation reaction calorimeter0 adetailed study on heat of reaction and heat rate determination o cMAR a132-1410 v443 a

The present study reports experimental heat of reaction and heat rate data of nitrobenzene hydrogenation to aniline reaction with process parameter variation. A high-pressure isothermal power compensation reaction calorimeter was used for this work. A systematic and step-by-step procedure is also reported to determine the heat of reaction and heat rate for a highly exothermic reaction. The sensitivity of experimental molar heat of reaction (kJ/mol) and evolved heat rate (W) values for nitrobenzene hydrogenation reaction was analyzed for various important process parameters, such as temperature, pressure, substrate quantity, solvent quantity, catalyst quantity, RPM, and hydrogen feed rate. Nitrobenzene hydrogenation reactions were conducted using ethanol as solvent and 5% Pd/C as a catalyst with 55-65 degrees C temperature and 7-9 Bar absolute pressure range. More than 99.99% conversion of nitrobenzene to aniline was obtained, and no other by-products were found. The average experimental nitrobenzene hydrogenation heat of reaction of 21 different experiments was found to be -581.87 kJ/mol, and the maximum heat rate during the nitrobenzene hydrogenation reaction was found to be 16.16 W for experiments using 10 gm of nitrobenzene in solvent.

10aheat of reaction10aheat rate10aHydrogenation10anitrobenzene10apower compensation10areaction calorimeter1 aKumar, Rajendra1 aMane, Pradip, R.1 aShingote, Savita, K.1 aMali, Nilesh, A. uhttps://library.ncl.res.in/content/detailed-study-heat-reaction-and-heat-rate-determination-nitrobenzene-hydrogenation-aniline