Table of Contents
ISRN Thermodynamics
Volume 2013, Article ID 253437, 4 pages
Research Article

A New Cryogenic Air Separation Process with Flash Separator

Department of Chemical Engineering, Faculty of Engineering, University of Khartoum, P.O. Box 321, Khartoum 11111, Sudan

Received 15 May 2013; Accepted 13 June 2013

Academic Editors: R. R. Burnette, T. Chen, P. Espeau, and P. Trens

Copyright © 2013 Zeinab A. M. Khalel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new cryogenic air separation process with flash separator is developed. A flash separator is added to the conventional double-column cryogenic air separation process. The flash separator is used to replace the turbine required to recover a portion of the energy in the double-column air separation process. The flash separator served dual purposes of throttling and separation. Both the conventional and the new processes are simulated using Aspen Plus version 11.1 the model air flow rate and compositions are taken as 50000 Nm3/h of air at standard conditions of 1 atm and 25°C and feed composition of 79.1% N2 and 20.9% O2. The new process decreases the energy consumption and increases the productivity.