Chemical Engineering & Technology

Cover image for Vol. 37 Issue 9

Impact Factor: 2.175

ISI Journal Citation Reports © Ranking: 2013: 39/133 (Engineering Chemical)

Online ISSN: 1521-4125

Associated Title(s): Chemie Ingenieur Technik, ChemBioEng Reviews, Energy Technology

Editors' Choice

Every month, the Editors select two papers referring to current discussions in the scientific, public and economic communities and in view of the potential for further developments. The papers are freely accessible for one month.

Efficiency of Emergency Safety Showers

September 08, 2014


Safety body showers operating with water have proven to be an effective emergency equipment for people whose clothing has caught fire and for the removal of hazardous substances from skin. These showers are widely used in laboratories and in many production sites. While detailed requirements for emergency safety showers have been stated in standards, only very few reports have been published to date about investigations into the key factors for emergency shower fire extinguishing and decontamination efficiency. T. H. Brock et al. investigated the decontamination of water-soluble contaminants using 15 customary shower heads at different water flow rates. They could not observe a systematic relation between water flow rate and characteristic wash-off time for the removal of the selected water-soluble model contaminants. Increasing the water flow rate of overhead emergency safety showers to more than 30 L min–1 does not create a general benefit regarding the wash-off effect; the intuitive assumption “a lot helps a lot” does not apply in this case. The local and temporal uniformity of wetting bears a significant relation with the characteristic wash-off time and might facilitate the improved evaluation of shower head effectiveness in the future.

T. Brock, V. Heil, H. Philipp, U. Seifert, W. Steffens, and K. Timm
Effect of Water Flow Rate on Decontamination Efficiency of Emergency Safety Showers
Chem. Eng. Technol. 2014, 37 (9), 1559–1565.
DOI: 10.1002/ceat.201400142


Hybrid Process for o- and p-Xylene Production in Aromatics Plants

September 08, 2014


Xylenes constitute a family of C8 aromatics, which generally are produced as a mixture, containing the three xylene isomers, o-xylene, m-xylene, and p-xylene. Over time, the demand for xylene compounds increased as raw materials in several industries. Since xylenes are generated as a mixture, their separation largely determines the capital cost of production. A. E. Rodrigues et al. studied the application of simulated moving bed (SMB) technology for the separation of xylene isomers in liquid phase by simulation using xylene adsorption equilibrium data of MIL-53(Al) obtained experimentally. An SMB unit with 24 columns was considered in the configuration form of 2-8-12-2. The separation of o-xylene from p-xylene using m-xylene as desorbent was investigated. An industrial-scale SMB unit was simulated and a set of operating conditions was determined for obtaining extract and raffinate streams with purities above 99.9 %. The pair MIL-53(Al)/m-xylene was found to be a good candidate as adsorbent/eluent pair to be applied in a hybrid process for the separation of xylene isomers, combining adsorption and crystallization technologies.

M. A. Moreira, A. F. P. Ferreira, J. C. Santos, J. M. Loureiro, and A. E. Rodrigues
Hybrid Process for o- and p-Xylene Production in Aromatics Plants
Chem. Eng. Technol. 2014, 37 (9), 1483–1492.
DOI: 10.1002/ceat.201300724