2010 Annual Meeting

(440e) Development of a Rate-Based Mass Transfer/Reaction Model Using Data From An Industrial NOx Absorption Process

Authors

Loutet, K. G. - Presenter, NORAM Engineering and Constructors Ltd.
Mahecha-Botero, A. - Presenter, University of British Columbia
Boyd, T. - Presenter, NORAM Engineering and Constructors Ltd.
Buchi, S. - Presenter, NORAM Engineering and Constructors Ltd.
Brereton, C. M. - Presenter, NORAM Engineering and Constructors Ltd.
Reid, D. - Presenter, Hunstman Polyurethanes (UK) Ltd.


An industrial reactive separation process for NOx absorption into water and nitric acid in a world-scale mononitrobenzene (MNB) plant in Redcar, UK was investigated. Gas- and liquid-phase concentrations were measured in situ while operating conditions such as temperature, pressure and absorbent flow were varied. Furthermore, a comprehensive mass transfer/reaction model was developed in the process simulator Aspen Plus to simulate the absorption process, with the field process data used for validation. The model accurately predicted NOx removal from the gas (i.e. typically within 3.5% of the plant data). Other key findings are that the model successfully predicted changes in performance when key parameters such as temperature and pressure were varied. Furthermore, the addition of a bleaching section was investigated, resulting in a significant improvement in NOx removal. Currently, the completed model is used to simulate existing and proposed NOx absorption systems and to develop new and innovative designs for NOx capture.