Journal of Food, Agriculture and Environment
Oxidative characteristic and process about wet air oxidation on phenolic ether and alcohol ether
Author(s):
Wenwei Tang 1*,
Lujun Wu 1, Xinping Zeng 2Recieved Date: 2013-07-18, Accepted Date: 2013-10-12
Abstract:In order to in-depth study the mechanism about wet air oxidation (WAO) to emulsification wastewater, the characteristics of WAO of typical non-ion surfactants (phenolic ether and alcohol ether) were studied in a 2-litre high-pressure batch autoclave, as well as its main intermediates, the rate-determining step and reaction mechanism. The study showed that temperature played a decisive role in WAO to phenolic ether, especially between 220°C and 240°C. Oxidation rate of phenolic ether remarkably accelerated at 240°C, and CODCr removal rate reached 97.8% within 2 h; Fatty acid was the main intermediate in WAO on phenolic ether, and its concentration went down with temperature increasing. Acetic acid was the maximum component among preliminary fatty acids and its contribution ratio to the fatty acids was higher with higher temperature and longer reaction time. The oxidation of acetic acid was also the key rate-limiting step through the process. Oxidative decomposition of phenolic ether and oxidation of fatty acids were the key rate-limiting steps of WAO on phenolic ether. The former dominated in the process at lower temperature while the latter did at higher temperature. Alcohol ether was easier to be oxidized than phenolic ether. Partitioned first order kinetics model could conduct a better fitting of the experiment data in the lagging stage of the reaction. The apparent activation energy of alcohol ether in the leading and lagging stages was lower than that of phenol ether, so it was relatively less affected by the reaction temperature and could acquire a higher oxidation rate at low temperature. A conclusion can be drawn that WAO process could be widely applied in emulsification wastewater containing different non-iconic surfactants.
Keywords:Wet air oxidation,
phenolic ether, alcohol ether, rate-limiting step, kinetics modelJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 1596-1599
Full text for Subscribers
Information:
Note to users
The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.
Article purchasing
If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.
Purchase this Article: 20 Purchase PDF Order Reprints for 15
Share this article :