Search Results
–214. For selected examples of hydrogenation reaction of nitro compounds under continuous-flow conditions, see: (a) Chen, J.; Przyuski, K.; Roemmele, R.; Bakale, R. P. Org. Process. Res. Dev . ASAP; (b) Javaid, R.; Kawasaki, S-i.; Suzuki, A.; Suzuki, T. M
Abstract
The effect of stable iodine on the radiolysis of the TBP-dodecane solvent was examined at two nitric acid concentrations. The results obtained indicate that presaturation of the solvent with stable iodine causes marked increase in the yields of organic nitrites and hydroxy-compounds and decrease of the yield of HDBP, carbonyl and nitro-compounds. The mechanisms of observed effects are discussed.
Abstract
Analytical equations related adiabatic runaway reactions to programmed scanning thermal curves from differential scanning calorimetry (DSC) were proposed. Thermal or pressure hazards can be assessed from the adiabatic trajectories expressed in the analytical equations. These industrially energetic materials include polymerizable monomers, unstable organic peroxides and nitro-compounds. Various emergency relief behaviors, such as tempered vapor, gassy, and hybrid were re-evaluated for calculating vent sizing or mass flow rates from DSC thermal curves and the related physical properties.
Abstract
In this study, a high catalytic activity of palladium nanoparticles immobilized on alumina (Al2O3) is reported for the industrially important reduction of aromatic nitro compounds to amino compounds. The palladium nanoparticles were immobilized on alumina by a simple physical precipitation method. The synthesis of palladium nanoparticles was done in ethylene glycol without using any external stabilizing agent. The composite particles exhibited good colloidal stability. The catalytic activity is investigated qualitatively by high performance liquid chromatography (HPLC) and quantitatively by photometrically monitoring the reduction of p-nitrophenol by an excess of sodium borohydride (NaBH4) in the presence of nanocomposites. The kinetic data could be explained by the assumption of pseudo first-order reaction with respect to p-nitrophenol.
Abstract
Thermal decomposition of metal-organic precursors for the mixed oxide BaBiO3 was studied using TG and EGA. Precursors produced by polyesterification of bifunctional acids with ethylene glycol (Pechini process) decomposed about 100°C higher than those without the diol. BaCO3 was identified by IR and XRD as a reaction intermediate. EGA proved that the amount of BaCO3 was below 10% of the total barium, and that the barium exists mainly as a nitro-compound up to 650°C. Phase-pure BaBiO3 with a moderately high surface area (1.4 m2/g) could be synthesised from a citrate precursor by the Pechini process at around 850°C.
complex. Though palladium, platinum, rhodium and ruthenium complexes have been anchored to a variety of supports, palladium complexes find an important place in the hydrogenation of nitro compounds under mild conditions [ 7 – 10 ]. In our earlier study, we
(classification) of nitro compounds depending on their structural features was carried out. This enabled us to elaborate the methodology for computer-aided generation of the complete spectra of reactions that are formally possible during thermolysis of compounds
instability of dinitro and higher polynitroaromatic compounds advise the use of a liquid-phase reaction [ 1 ]. The selective hydrogenation of nitro-compounds is commonly used to manufacture amines, which are important intermediates for dyes, urethanes
Introduction The hydrogenation of nitro compounds is an interesting industrial process for the manufacture of a great variety of oximes, amines and amides. Of these, cyclohexane oxime and ∊-caprolactam are important
), as has been noted for the hydrogenation of aliphatic [ 15 ] and aromatic [ 16 ] nitro-compounds in both gas [ 17 , 18 ] and liquid [ 19 , 20 ] phase operation. We have previously demonstrated exclusive –NO 2 group reduction in gas phase
