NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.13 [2006] >
IJCT Vol.13(6) [November 2006] >


Title: Vapour phase transesterification over modified ZrO2-Al2O3 and ZrO2-SiO2 for the synthesis of isoamyl salicylate
Authors: D’Souza, Joyce
Nagaraju, N
Keywords: Transesterification
Sulphate
Borate
Phosphate-modified zirconia
Alumina
Silica
Solid acids
Isoamyl salicylate
Issue Date: Nov-2006
Publisher: CSIR
IPC CodeB01J31/00, B01J31/22
Abstract: Vapour phase transesterification of methyl salicylate with isoamyl alcohol in the presence of simple oxides, mixed oxides and their modified forms as catalysts was carried out. A systematic study was made with zirconia, alumina and silica and the complete series of zirconia-alumina and zirconia-silica mixed oxides for 10-100% composition of zirconia, as well as the sulphate, phosphate and borate treated forms to identify the most suitable catalyst for this reaction. All the catalysts used for the study exhibited catalytic activity for this transesterification reaction. The only side-product formed was phenol, apart from the primary byproduct methanol. The catalytic activity of zirconia, alumina and silica is in the range of 12 to 15%. There is a significant increase in the catalytic activity when these simple oxides are modified by sulphate, borate and phosphate ions. The trend in the increase in activity on modification is zirconia > alumina > silica. Among the anions, the trend in the increase in the activity is sulphate > phosphate > borate. However, the phosphated forms score over the sulphated forms for this reaction because (a) the activity of phosphated forms does not reduce with time on stream up to 2 h while there is a noticeable reduction in the catalytic activity of sulphated forms within 15 minutes from the start of the reaction and (b) there is no coke formation when the phosphated forms are used while sulphated forms lead to excessive coke formation and loss of reactants. The mixed oxide ZrO2-Al2O3 of 20% ZrO2 composition modified with phosphate ions is found to be the most suitable catalyst for this reaction.
Page(s): 640-643
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.13(6) [November 2006]

Files in This Item:

File Description SizeFormat
IJCT 13(6) 640-643.pdf491.49 kBAdobe PDFView/Open
 Current Page Visits: 1015 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 570223 since 06-Feb-2009  Last updated on 14-Aug-2014Webmaster: nopr@niscair.res.in