02098nas a2200253   4500008004100000022001400041245010300055210006900158260010600227300001200333490000700345520115900352653001001511653001401521653001301535653002501548653002201573653002501595653002501620100001601645700002401661700002901685856013001714       2010                        eng d  a0009-250900aKinetics of reductive alkylations of phenylenediamines: influence of substrates isomeric structure0 aKinetics of reductive alkylations of phenylenediamines influence  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJAN  a232-2390 v653 a<p>Reductive alkylation of ortho-, meta- and para-phenylenediamines (PDAs) with methyl ethyl ketone (MEK) has been studied in a semi-batch slurry reactor in the presence of a commercial 3% Pt/Al(2)O(3) catalyst. It was observed that the PDA isomers differ remarkably from each other in their activity in reductive alkylation and product distribution. The activity was found to decrease in the following order: PPDA &gt; OPDA &gt; MPDA. To understand the substrate structure-activity correlation, the homogeneous equilibrium reactions involved in the alkylation step and the overall catalytic reactions were studied separately. Kinetics of reductive alkylation of PDAs with MEK as a solvent and alkylating agent with 3% Pt/Al(2)O(3) catalyst was studied in a semi-batch slurry reactor over a temperature range of 373-453K and pressure range of 2.07-6.21 MPa. Semi-batch slurry reactor models were developed and kinetic parameters were estimated by fitting the integral batch reactor data at different temperatures to understand the influence of different reaction steps on the activity and selectivity of different products. Published by Elsevier Ltd.</p>10aBatch10acatalysis10akinetics10aMultiphase reactions10aPhenylenediamines10aReaction engineering10aReductive alkylation1 aRoy, Debdut1 aChaudhari, Amit, S.1 aChaudhari, Raghunath, V.  uhttps://library.ncl.res.in/content/kinetics-reductive-alkylations-phenylenediamines-influence-substrates-isomeric-structure-002138nas a2200265   4500008004100000022001400041245012100055210006900176260010600245300001400351490000700365520112700372653002301499653003801522653001301560653002901573653002501602653001501627100002201642700002501664700001501689700002401704700001801728856012601746       2011                        eng d  a0009-250900aKinetics of hydroformylation of 1-octene in ionic liquid-organic biphasic media using rhodium sulfoxantphos catalyst0 aKinetics of hydroformylation of 1octene in ionic liquidorganic b  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAPR  a1631-16390 v663 a<p>Biphasic hydroformylation of 1-octene was performed using rhodium sulfoxantphos catalyst dissolved in [BuPy][BF(4)] ionic liquid. Preliminary experiments proved this system to retain the catalytic complex within the ionic liquid phase and to maintain a high selectivity towards the linear aldehyde (n:iso ratio of 30) over several cycles. Process parameter investigation showed a first order dependence of the initial rate with respect to the catalyst and 1-octene concentrations, but a more complex behavior with respect to hydrogen (fractional order) and carbon monoxide partial pressures (inhibition at high pressures). Different mathematical models were selected based on the trends observed and evaluated for data fitting. Also, rate models were derived from a proposed mechanism, using Christiansen matrix approach. To calculate concentrations of substrates in the catalytic phase as required by this kinetic modeling, solubility measurements were preformed for the gases (pressure drop technique), as well as for 1-octene and n-nonanal (thermogravimetry analysis). (C) 2011 Elsevier Ltd. All rights reserved.</p>10aBiphasic catalysis10aButylpyridinium tetrafluoroborate10akinetics10aParameter identification10aReaction engineering10asolubility1 aDeshpande, R., M.1 aKelkar, Ashutosh, A.1 aSharma, A.1 aJulcour-Lebigue, C.1 aDelmas, Henri  uhttps://library.ncl.res.in/content/kinetics-hydroformylation-1-octene-ionic-liquid-organic-biphasic-media-using-rhodium-0