Acid catalysed alkylation of diphenyl ether with methanol over shape-selective zeolites

Master Thesis

2005

Permanent link to this Item
http://hdl.handle.net/11427/5423
Files
thesis_ebe_2005_ntshabele_j_p_p.pdf (9.63 MB)
Authors
Ntshabele, John Phenyo Pheko
Supervisors
Fletcher, Jack
Böhringer, Walter
Journal Title
Link to Journal
Journal ISSN
Volume Title
Publisher
Publisher

University of Cape Town

Department
Department of Chemical Engineering
Faculty
Faculty of Engineering and the Built Environment
License
Series
Abstract
Selectivity in methylation of phenol over acidic catalysts depends primarily on temperature and the acidity of the catalyst. It is reported that direct methylation of phenol with methanol over weakly acidic catalysts yields predominantly o-cresol, whilst catalysts with medium acidity yield primarily o- and p-cresol, with significant anisole formation at lower temperatures (≈ 200°C). m-Cresol is, however, formed with significant selectivity over strongly acidic catalysts or at higher temperatures (typically 300°C and more). To date, only one industrial process is known which is selective to p-cresol but has the disadvantage of co-formaiton of inorganic salt, which is costly to dispose of.
Description

Includes bibliographical references (p. 177-185).

Keywords
Chemical Engineering

Reference:

Ntshabele, J. 2005. Acid catalysed alkylation of diphenyl ether with methanol over shape-selective zeolites. University of Cape Town.

Collections
Masters