01555nas a2200217   4500008004100000022001400041245010400055210006900159260007300228300001200301490000800313520076100321653001601082653001701098653002701115653001801142653001801160653001801178100001601196856012501212       2005                        eng d  a0040-603100aPressure dependence of the dissociation of acetic, benzoic, mandelic and succinic acids at 298.15 K0 aPressure dependence of the dissociation of acetic benzoic mandel  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC  a154-1570 v4393 a<p>Dissociation constants for acetic, benzoic, mandelic and succinic acids have been measured at 298.15 K as a function of pressure up to 138.8 MPa. The spectrophotometric technique using Bromocresol Green as the optical indicator was employed up to ionic strength of 0.03 mol kg(-1) in aqueous solution. Thermodynamic dissociation constants were calculated with the Davies activity coefficient equation. The pressure dependences of the ionization constants for the weak acids can be described by the equation of Lown, Thirsk and Wynne-Jones, application of which leads to accurate partial molal volume change on ionization, Delta(V) over bar (o) and compressibility change, Delta(K) over bar (o) at 0.1 MPa. (C) 2005 Elsevier B.V. All rights reserved.</p>10aAcetic acid10abenzoic acid10adissociation constants10ahigh pressure10amandelic acid10asuccinic acid1 aKumar, Anil  uhttps://library.ncl.res.in/content/pressure-dependence-dissociation-acetic-benzoic-mandelic-and-succinic-acids-29815-k-001026nas a2200265   4500008004100000022001400041245011800055210006900173260009800242300001200340490000800352653001600360653001700376653003600393653003900429100001700468700001800485700002000503700002000523700002600543700001800569700002100587700002200608856013000630       2006                        eng d  a0268-257500aSynthesis, characterization, X-ray structure and DNA photocleavage by cis-dichloro bis(diimine) Co(III) complexes0 aSynthesis characterization Xray structure and DNA photocleavage   aTHE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLANDbJOHN WILEY & SONS LTDcMAR  a331-3430 v10010aAcetic acid10aacrylic acid10aoxidative conversion of propane10arare earth-doped Mo-V-Sb catalysts1 aGhosh, Smita1 aBarve, A., C.1 aKumbhar, A., A.1 aKumbhar, A., S.1 aPuranik, Vedavati, G.1 aDatar, P., A.1 aSonawane, U., B.1 aJoshi, Rohini, R.  uhttps://library.ncl.res.in/content/synthesis-characterization-x-ray-structure-and-dna-photocleavage-cis-dichloro-bisdiimine-102785nas a2200289   4500008004100000022001400041245018600055210006900241260006100310300001000371490000800381520172800389653001602117653001102133653001302144653002202157653002402179100002902203700002102232700002002253700002102273700001302294700001702307700001802324700002802342856012502370       2008                        eng d  a1011-372X00aSelective oxidation of ethane over Mo-V-Al-O oxide catalysts: insight to the factors affecting the selectivity of ethylene and acetic acid and structure-activity correlation studies0 aSelective oxidation of ethane over MoVAlO oxide catalysts insigh  a233 SPRING STREET, NEW YORK, NY 10013 USAbSPRINGERcFEB  a39-510 v1213 a<p>Catalysts of general formula, MoVAlOx were prepared with the initial elemental composition of 1:0.34:0.167 (Mo:V:Al) at a pH value in the range of 1-4. The elemental analysis showed that the final composition of the catalysts is pH dependant. The performance of the catalysts was tested for selective oxidation of ethane to give ethylene and acetic acid. While all of them were active for ethane oxidation with a moderate conversion, the catalyst prepared at pH 2 showed a highest activity with 23% ethane conversion and a combined selectivity of 80.6% to ethylene and acetic acid. The catalyst prepared at pH 4 was least selective to ethylene and acetic acid. Various techniques like powder XRD, SEM, Raman, UV-Vis and EPR were used to characterize the catalysts and to identify the active phases responsible for the selective oxidation of ethane. The powder XRD data showed that the catalysts prepared at pH 1 and 2 contain mainly of MoO3 and MoV2O8 along with traces of Mo4O11. The amount of MoO3 was slightly higher in the catalyst prepared at pH 1. However, the catalyst prepared at pH 3 contains mainly of MoV2O8 with no trace of MoO3. The catalyst prepared at pH 4 showed V2O5 as the major phase along with MoVAlO4 phase. The Raman data corroborated the XRD results. EPR and UV-Vis studies indicated the presence of traces of V-4 in pH 1 and 2 catalysts and significant amount of Mo5+ in all the catalysts. Thus, the high activity and selectivity to ethylene and acetic acid are attributed to the presence of MoV2O8 phase and other reduced species like Mo4O11 phase supported on MoO3. The presence of V and Mo ions in a partially reduced form seems to play a crucial role in the selective oxidation of ethane.</p>10aAcetic acid10aethane10aEthylene10amixed metal oxide10aSelective oxidation1 aSankaranarayanan, T., M.1 aIngle, Rohit, H.1 aGaikwad, T., B.1 aLokhande, S., K.1 aRaja, T.1 aDevi, R., N.1 aRamaswamy, V.1 aManikandan, Palanichamy  uhttps://library.ncl.res.in/content/selective-oxidation-ethane-over-mo-v-al-o-oxide-catalysts-insight-factors-affecting-001206nas a2200229   4500008004100000022001400041245006600055210006500121260008900186300001200275490000700287520045600294653001600750653002300766653001200789653001400801653001200815100002000827700001700847700001700864856009500881       2009                        eng d  a0022-445600aEntrainer for batch distillation of acetic acid -water system0 aEntrainer for batch distillation of acetic acid water system  aDR K S KRISHNAN MARG, NEW DELHI 110 012, INDIAbNATL INST SCIENCE COMMUNICATIONcOCT  a871-8750 v683 a<p>Acetic acid-water system (AW) poses a challenge in reactive distillation, acetic acid purity and loss of acetic acid in aqueous solutions. Feasible separation of AW has been studied using entrainers but acetic acid loss in lean phase cannot be avoided. This study presents feasible region to operate column with toluene and benzene as entrainer for AW. Liquid-liquid equilibrium data and nature of tie line for ethyl acetate are given priority.</p>10aAcetic acid10aBatch distillation10aBenzene10aEntrainer10aToluene1 aGadekar, S., V.1 aNaik, R., V.1 aKaul, S., N.  uhttps://library.ncl.res.in/content/entrainer-batch-distillation-acetic-acid-water-system-002092nas a2200253   4500008004100000022001400041245010500055210006900160260007300229300001200302490000700314520115000321653001601471653001701487653004701504653002501551653002001576100002701596700002401623700002001647700002501667700002001692856012601712       2010                        eng d  a1003-995300aOxidation of propane to acrylic acid and acetic acid over alkaline earth-doped Mo-V-Sb-O-x catalysts0 aOxidation of propane to acrylic acid and acetic acid over alkali  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a593-5990 v193 a<p>Alkaline earth metal (Mg, Ca, Sr and Ba)-doped Mo-V-Sb-O-x catalysts, prepared by a dry-up method, have been investigated for their catalytic performance in the oxidation of propane under different reaction conditions. The catalysts have been characterized by N-2 adsorption-desorption, temperature-programmed desorption (TPD) of NH3, SEM and XRD. Influence of water vapor on the catalytic performance, particularly on the selectivities to acetic acid and acrylic acid, has also been studied. The selectivity to acrylic acid was improved significantly by the doping of alkaline earth metals to Mo-V-Sb-O-x catalysts. The surface acidic sites of the catalyst decreased with the doping of the catalyst with alkaline earth metals, which ultimately was found to be beneficial for obtaining high selectivity to acrylic acid. The catalytic activity and product selectivities were found to be influenced by the reaction temperature, C3H8/O-2 ratio and space velocity. A significant improvement in the selectivity to acrylic acid has also been observed by the addition of water vapor in the feed of propane and oxygen in the oxidation of propane.</p>10aAcetic acid10aacrylic acid10aalkaline earth doped Mo-V-Sb-O-x catalysts10aoxidation of propane10aSurface acidity1 aChaudhari, Chandan, S.1 aSable, Shailesh, S.1 aGurav, Hanumant1 aKelkar, Ashutosh, A.1 aRane, Vilas, H.  uhttps://library.ncl.res.in/content/oxidation-propane-acrylic-acid-and-acetic-acid-over-alkaline-earth-doped-mo-v-sb-o-x-001491nas a2200217   4500008004100000022001400041245012200055210006900177260007300246300001200319490000700331520068400338653001601022653001201038653001801050653001901068653002401087100002001111700002201131856012001153       2010                        eng d  a1003-995300aSynthesis of ethyl acetate by esterification of acetic acid with ethanol over a heteropolyacid on montmorillonite K100 aSynthesis of ethyl acetate by esterification of acetic acid with  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a161-1640 v193 a<p>In present work, liquid phase esterification of acetic acid with ethanol over dodecatungestophosphoric acid (DTPA) supported on K10 mommorillonite was systematically studied and optimization of process parameters was carried out The 20% m/m urpAtK tO was found to be the optimum catalyst with 90% acetic acid conversion and 100% ethyl acetate selectivity The study was also explored to see the feasibility of 20% m/m DTPA/K10 as a catalyst for the alkylation of acetic acid with other alcohols like methanol, iso-propanol and sr-butanol. The 20% m/m DTPA/K10 has shown increased activity with the increase in carbon number, at the same alcohol reflux The results are novel</p>10aAcetic acid10aEthanol10aethyl acetate10aHeteropolyacid10amontmorillonite K101 aGurav, Hanumant1 aBokade, Vijay, V.  uhttps://library.ncl.res.in/content/synthesis-ethyl-acetate-esterification-acetic-acid-ethanol-over-heteropolyacid-002353nas a2200229   4500008004100000022001400041245016000055210006900215260006700284300001200351490000700363520144500370653001601815653003301831653001901864653001801883653002401901100002401925700002901949700002201978856012302000       2014                        eng d  a0894-323000aPseudo-homogeneous kinetic model for esterification of acetic acid with propanol isomers over dodecatungstophosphoric acid supported on montmorillonite k100 aPseudohomogeneous kinetic model for esterification of acetic aci  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcFEB  a121-1270 v273 a<p>Esterification of acetic acid with propanol isomers such as isopropanol and naEuropropanol was carried out over dodecatungstophosphoric acid (DTPA), dodecamolybdophosphoric acid ammonium salt hydrate, and sodium tungstate hydrated purified supported on montmorillonite K10, which were characterized by powder XaEuroray diffraction, BrunaueraEuro'EmmettaEuro'Teller, and temperature programmed ammonia desorption. A pseudoaEurohomogeneous (PaEuroH) kinetic model was established for esterification of acetic acid with propanol isomers over DTPA supported on montmorillonite K10. Effects of various parameters such as reaction time, speed of agitation, particle size, temperature, percent catalyst loading, molar ratio and mixture of propanol isomer were investigated in detail. The 20% (w/w) DTPA/K10 was found to be an optimum solid catalyst with 82% naEuropropanol and 53% isopropanol conversion with 100% selectivity toward propyl acetate. The 20% (w/w) DTPA/K10 catalyst was found to be reusable for three cycles. The reaction follows secondaEuroorder kinetics with activation energies of 25.53aEuro?kJaEuro?mol(a?'1) and 28.15aEuro?kJaEuro?mol(a?'1) for isopropanol and naEuropropanol, respectively. PseudoaEurohomogeneous kinetic model fitted with R-2 value of trend line 0.999. This implies that esterification reaction is kinetically controlled owing to high activation energy. Copyright a (c) 2013 John Wiley &amp; Sons, Ltd.</p>10aAcetic acid10adodecatungstophosphoric acid10aEsterification10akinetic model10amontmorillonite K101 aGurav, Hanumant, R.1 aNandiwale, Kakasaheb, Y.1 aBokade, Vijay, V.  uhttps://library.ncl.res.in/content/pseudo-homogeneous-kinetic-model-esterification-acetic-acid-propanol-isomers-over-002167nas a2200253   4500008004100000022001400041245009900055210006900154260009500223300001200318490000700330520123800337653001601575653001901591653001901610653001601629653002201645653002201667100002901689700002401718700002001742700002201762856012901784       2015                        eng d  a0263-876200aBenzylation of acetic acid to benzyl acetate over highly active and reusable micro/meso-HZSM-50 aBenzylation of acetic acid to benzyl acetate over highly active   a165-189 RAILWAY TERRACE, DAVIS BLDG, RUGBY CV21 3HQ, ENGLANDbINST CHEMICAL ENGINEERScJAN  a584-5900 v933 a<p>Catalytic benzylation of acetic acid (AA) with benzyl alcohol (BA) to benzyl acetate was studied over zeolites viz. H-ZSM-5 (microporous, medium pore), Micro/Meso-HZSM-5 (combination of micro- and meso pore), H-Beta (microporous, large pore) to investigate catalytic activity and selectivity towards benzyl acetate. Micro/Meso-HZSM-5 obtained by desilication post-treatment has been employed as a heterogeneous catalyst for benzylation reaction probably for the first time. Micro/Meso-HZSM-5 was found to be a promising catalyst for benzylation with AA conversion of 94%, selectivity towards benzyl acetate of 95%. The detailed optimization of process parameters such as molar ratio, catalyst loading, reaction temperature and time was also presented. Micro/Meso-HZSM-5 catalyst was observed to be stable for six cycles (1 fresh and 5 recycles). The first order reaction kinetics (R-2 &gt;0.98) indicated that reaction rate constants increased with increasing reaction temperature. The activation energy for benzylation of AA with BA over Micro/Meso-HZSM-5 was obtained to be 15.07 kJ mol(-1), which is far less than the reported. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.</p>10aAcetic acid10aBenzyl acetate10aBenzyl alcohol10aBenzylation10aMicro/Meso-HZSM-510aReaction kinetics1 aNandiwale, Kakasaheb, Y.1 aGalande, Nitish, D.1 aRaut, Sunil, A.1 aBokade, Vijay, V.  uhttps://library.ncl.res.in/content/benzylation-acetic-acid-benzyl-acetate-over-highly-active-and-reusable-micromeso-hzsm-5-002565nas a2200253   4500008004100000022001400041245013700055210006900192260000800261300001400269490000700283520171500290653001602005653001302021653000802034653002402042653002002066653002502086100002002111700002502131700001902156700001602175856012002191       2024                        eng d  a2190-681500aEffect of furfural, acetic acid and 5-hydroxymethylfurfural on yeast growth and xylitol fermentation using Pichia stipitis NCIM 34970 aEffect of furfural acetic acid and 5hydroxymethylfurfural on yea  cFEB  a4909-49230 v143 a<p>
	The valorization of C5 sugars (xylose) from hemicellulose of agro-industrial residues to xylitol, as one of the multi-products biorefinery approach, mandates the pretreatment of biomass which releases fermentable sugars along with the generation of biological inhibitors affecting xylitol fermentation. This study was therefore evaluated to understand the inhibitory kinetics of furfural, 5-hydroxymethylfurfural and acetic acid on xylitol fermentation. Xylitol fermentation was established using Pichia stipitis NCIM 3497 with xylose as a pure substrate optimized for xylitol yield and productivity of 0.48 g/g of xylose and 0.13 g/L/h, respectively. The functional relationship of yeast specific growth rate and limiting substrate (xylose) was expressed by Monod-type kinetics. The inhibition kinetics results indicated that the effect of inhibitors on xylitol fermentation was furfural &gt; acetic acid &gt; HMF. Furfural (500 mg/L) and acetic acid (1000 mg/L) reduced xylitol yield by 59% and 44%, respectively, with least reduction of 9.89% exhibited by HMF. The synergistic effect of 500 mg/L furfural, 500 mg/L HMF and 1000 mg/L acetic acid showed the highest reduction in xylitol yield of 67.6% as compared to the control. Kinetic studies predicted that the maximum concentration of furfural, HMF and acetic acid which inhibited P. stipitis growth was 884 mg/L, 3258 mg/L and 2922 mg/L, respectively, whereas xylitol production was completely inhibited at 1069 mg/L furfural, 3498 mg/L HMF and 3714 mg/L acetic acid. Furfural and acetic acid were found to be a competitive inhibitor, while uncompetitive inhibition was observed with HMF indicating negligible effect on xylitol fermentation.</p>
10aAcetic acid10afurfural10aHMF10aInhibition kinetics10aPichia stipitis10aXylitol fermentation1 aBhavana, B., K.1 aMudliar, Sandeep, N.1 aBokade, V., V.1 aDebnath, S.  uhttps://library.ncl.res.in/content/effect-furfural-acetic-acid-and-5-hydroxymethylfurfural-yeast-growth-and-xylitol