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Rahman I.,Chemical Engineering and Process Development Division | Bokade V.V.,CSIR - National Chemical Laboratory | Patnaik A.,Indian Institute of Technology Kharagpur | Das A.K.,Laxminarayan Institute of Technology
Indian Chemical Engineer | Year: 2010

This paper delves into the application of a robust optimisation tool, differential evolution (DE), to the disproportionation of ethylbenzene (EB) to produce the commercially important para-diethylbenzene (p-DEB). Through the application of this technique, EB conversion and selectivity of the p-DEB product are maximised against the three input variables of temperature, pressure and liquid hourly space velocity (LHSV), using a model. The catalytic process is represented by a multi-input multi-output (MIMO) orthogonal least-square (OLS) algorithm, using historic data. The optimized solutions are experimentally verified and show significant improvement in the p-DEB conversion and selectivity. © 2010 Indian Institute of Chemical Engineers. Source


Jha A.,Chemical Engineering and Process Development Division | Garade A.C.,Chemical Engineering and Process Development Division | Mirajkar S.P.,CSIR - National Chemical Laboratory | Rode C.V.,Chemical Engineering and Process Development Division
Industrial and Engineering Chemistry Research | Year: 2012

A novel application of phosphotungstic acid, H 3PW 12O 40 (PWA) supported on MCM-41 molecular sieve as a solid acid catalyst has been demonstrated for the synthesis of phenolphthalein by hydroxyalkylation of phenol and phthalic anhydride. PWA/MCM-41 (20%) showed the highest activity as compared to that of parent PWA and MCM-41 individually, due to the excellent dispersion of PWA on MCM-41 leading to the redistribution of Bronsted and Lewis acid sites on MCM-41. The effect of PWA loading on phthalic anhydride conversion and phenolphthalein selectivity was also studied. All these prepared catalysts were characterized by XRD, N 2 adsorption-desorption isotherm, pyridine-FTIR, and NH 3-TPD. The effect of various reaction parameters, namely, mole ratios, catalyst concentration, temperature, reaction time, and percentage of PWA present in the catalysts on conversion and selectivity of products has been also investigated. The utility of 20% PWA/MCM-41 catalyst was established by its efficient activity for hydroxyalkylation of phenol and p-cresol with formaldehyde to the corresponding dihydroxydiarylmethane products. © 2012 American Chemical Society. Source


Nadgeri J.M.,Chemical Engineering and Process Development Division | Garade A.C.,Chemical Engineering and Process Development Division | Tambe R.A.,CSIR - National Chemical Laboratory | Gokhale S.P.,CSIR - National Chemical Laboratory | Rode C.V.,Chemical Engineering and Process Development Division
Advanced Science Letters | Year: 2010

Multiwalled carbon nanotubes were prepared by thermal decomposition method followed by acid treatment and Pd-functionalization with PdCl2 by wet impregnation method. The Pd functionlized carbon nanotubes catalyst was characterized by BET, FT-IR, Raman, XRD, EDX, ICP-OES, SEM and TEM and was evaluated for its activity for hydrogenation of 2-butyne-1,4-diol. It showed higher selectivity (93%) to 2-butene-1, 4-diol than Pd supported on commercial carbon (70% selectivity to 2-butene-1, 4-diol) for complete conversion of 2-butyne-1,4-diol. The catalyst also exhibited excellent stability as evidenced by the three catalyst recycle experiments. © 2010 American Scientific Publishers. Source

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