02016nas a2200229 4500008004100000022001400041245009200055210006900147260007300216300001200289490000800301520122000309653001501529653002701544653001501571653001201586653000801598653001301606100001901619700002801638856012001666 2005 eng d a1381-116900aAlkylation of benzene with alpha-olefins over zirconia supported 12-silicotungstic acid0 aAlkylation of benzene with alphaolefins over zirconia supported  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG a137-1450 v2373 a

Liquid phase alkylation of benzene to linear alkyl benzene (LAB) with alpha-olefins has been investigated with 12-silicotungstic acid supported on zirconia (STA/ZrO2) as the catalyst. Among the catalysts, 15 wt.% STA/ZrO2 calcined at 750 degrees C was found to be most active than others in the alkylation reaction. The total amount of acid sites of different STA loaded catalysts were estimated by TPD of NH3 and 15 wt.% STA/ZrO2 calcined at 750 degrees C was found to have the highest acidity and more active in the reaction. The optimization of reaction conditions of alkylation of benzene with 1-dodecene was performed with 15 wt.% STA/ZrO2 calcined at 750 degrees C by varying catalyst concentration (1-5 wt.% of reaction mixture); temperature, 373-423 K and benzene: 1-dodecene (1-dd) molar ratio, 5-15 in a Parr autoclave under N-2 pressure. Under the optimized reaction conditions, conversion of 1-dodecene (50.8%) gave high selectivity to 2-phenyl dodecane (47.1%) and the remaining 3-, 4-, 5- and 6-phenyldodecanes in 4 h. The reaction was found to be heterogeneously catalyzed and no contribution from homogeneous (leached) STA into the reaction medium. (c) 2005 Elsevier B.V. All rights reserved.

10a1-dodecene10a12-silicotungstic acid10aAlkylation10aBenzene10aLAB10aZirconia1 aSawant, D., P.1 aHalligudi, Shivappa, B. uhttp://library.ncl.res.in/content/alkylation-benzene-alpha-olefins-over-zirconia-supported-12-silicotungstic-acid-002284nas a2200241 4500008004100000022001400041245011700055210006900172260007300241300001200314490000800326520138900334653003601723653001501759653001201774653002301786100002001809700002201829700002201851700001801873700002801891856012301919 2006 eng d a1381-116900aShape selective synthesis of long-chain linear alkyl benzene (LAB) with AIMCM-41/beta zeolite composite catalyst0 aShape selective synthesis of longchain linear alkyl benzene LAB  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL a239-2440 v2533 a

The liquid-phase alkylation of benzene with long-chain olefins such as 1-decene, 1-octene and 1-dodecene was carried out over AIMCM-41/Beta zeolite composite material as catalyst. The catalyst was prepared by seeding method and characterized by XRD, N-2 sorption, FTIR pyridine adsorption, NH3-TPD and SEM. Powder XRD of AlMCM-41/Beta zeolite composite material showed the co-existence of well-structured microporous and mesophase of AlMCM-41. The typical textural characteristics of micro- and meso-structured phases were observed in the composite material. The effect of temperature, reactant molar ratios and catalyst weight on 1-dodecene conversion and products selectivity was studied. The composite catalyst was found to be the highly selective towards the formation 2-dodecylbenzene. Under the reaction conditions of 120 degrees C, benzene/1-dodecene molar ratio 10 and time 2h, the catalyst gave 48% dodecene conversion with 76%, 2-dodecylbenzene selectivity. Significant improvement in catalytic activity has been achieved by composite material as compared to Al-MCM-41. Although zeolite beta and composite material gave similar conversion of dodecene, the composite material showed higher selectivity towards 2-dodecylbenzene, which could be due to higher diffusibility of 2-dodecylbenzene isomer in the composite material. (c) 2006 Elsevier B.V. All rights reserved.

10aAIMCM-41/beta zeolite composite10aAlkylation10aBenzene10along-chain olefins1 aBordoloi, Ankur1 aDevassy, Biju, M.1 aNiphadkar, P., S.1 aJoshi, P., N.1 aHalligudi, Shivaraj, B. uhttp://library.ncl.res.in/content/shape-selective-synthesis-long-chain-linear-alkyl-benzene-lab-aimcm-41beta-zeolite-001205nas a2200229 4500008004100000022001400041245006600055210006500121260008900186300001200275490000700287520045600294653001600750653002300766653001200789653001400801653001200815100002000827700001700847700001700864856009400881 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

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.

10aAcetic acid10aBatch distillation10aBenzene10aEntrainer10aToluene1 aGadekar, S., V.1 aNaik, R., V.1 aKaul, S., N. uhttp://library.ncl.res.in/content/entrainer-batch-distillation-acetic-acid-water-system-001990nas a2200217 4500008004100000022001400041245009600055210006900151260006900220300001100289490000800300520119000308653001201498653003101510653001101541653002401552653002901576100002201605700002201627856012301649 2009 eng d a1385-894700aSelective synthesis of cumene by isopropylation of benzene using catalytic membrane reactor0 aSelective synthesis of cumene by isopropylation of benzene using aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAPR a97-1010 v1473 a

Selective isopropylation of benzene to cumene is demonstrated using catalytic membrane reactor (CMR), to our knowledge for the first time and the performance was evaluated against conventional plug flow reactor (PFR). Almost complete elimination of byproducts like polyalkylated benzene and higher aromatics could be made possible by using CMR. These are present in significant amount when reaction is carried out with PFR. The cumene selectivity increased up to a maximum of 97.25% by CMR as against 90.05% with conventional PFR. The effect of reaction parameters that can greatly influence the process economics, such as liquid hourly space velocity (LHSV), reactant mole ratio and catalyst/reactor volume ratio were investigated. Changes in these parameters made for CMR are industrially advantageous. The process by CMR is more economical and ecofriendly than PFR as far as milder process parameters (higher LHSV, lower reactant feed mole ratio, less catalyst require, etc.) and process intensification (reaction and separation in single reactor) are concerned. The study provides new insights for benzene isopropylation reaction. (C) 2008 Elsevier B.V. All rights reserved.

10aBenzene10aCatalytic membrane reactor10acumene10aDiisopropyl benzene10aFriedel-Craft alkylation1 aBokade, Vijay, V.1 aKharul, Ulhas, K. uhttp://library.ncl.res.in/content/selective-synthesis-cumene-isopropylation-benzene-using-catalytic-membrane-reactor-0