This issue of the Canadian Journal of Chemical Engineering is a special issue containing some of the selected papers presented at the GLS 9 held within the 8th World Congress of Chemical Engineering (WCCE8) in Montréal, Canada from August 23 to 27, 2009. Professor Muthhana Al-Dahhan (Missouri University of Science and Technology, Rolla, USA) is honoured to serve as the guest editor with the help of his PhD student, Mohamed Ezat Awad (Washington University in St. Louis, USA). Following the previous successful GLS conferences, the ninth conference in 2009 was another success which covered aspects of gas, liquid and solids (GLS) reactors engineering related to the progress made in advancing the state-of-the-art of their understanding, performance, operation, and applications. Such progress is particularly needed for advancing processes and technologies related to the generation of sustainable and renewable clean energy, fuels and products and for environmentally benign and responsible processes for the production of chemicals and materials in order to maintain a clean environment, and to improve quality of life. The conference brought together scientists and engineers from academia, industry and national laboratories. GLS 9 was organised and chaired by Professor Muthanna Al-Dahhan (Missouri University of Science and Technology—Rolla, USA), Dr. Francis Luck (Total S.A., France) and Dr. Sailesh Kumar (UOP, USA). Two graduate students provided valuable help to the chairs, namely Mohamed Ezat Awad and Ahmed Youssef (PhD students at Washington University in St. Louis, USA). The scientific committee consists of distinguished faculty, scientists and engineers from around the world. Professor L. S. Fan (Ohio State University, Columbus, USA), the chair of the international board of GLS, provided valuable help and support to the GLS 9 organising team. Professor J. B. Joshi gave the GLS 9 Distinguished Lecture honouring his retirement at age 60. In addition, each technical session had a keynote lecture delivered by experts in the related fields. The technical contributions in GLS 9 were related to the following technical sessions: CFD and bubble dynamics, multiphase reactors and processes, reactive systems, heat and mass transfer, advanced measurement techniques, non-conventional reactor configurations, and bioprocesses. About 120 technical presentations were delivered in these sessions representing countries from the five continents. The Guest Editor (Professor Muthanna Al-Dahhan), GLS 9 organising team, Professor L. S. Fan, the members of the GLS international board and GLS 9 Scientific Committee are grateful to the Canadian Journal of Chemical Engineering for publishing some of the selected papers that were presented in the conference.
Muthanna Al-Dahhan is a Professor and Chairman of the Chemical and Biological Engineering Department and Professor of Nuclear Engineering at Missouri University of Science and Technology—Rolla, Missouri, USA. He holds three degrees in Chemical Engineering. He received his Doctoral degree from Washington University in 1993, his MSc from Oregon State University in 1988 and his BSc from the University of Baghdad, Iraq in 1979. His research interests are related to advancing the knowledge and understanding of multiphase reaction engineering, reactors and processes via advanced measurement and computational techniques (including radioisotope-based techniques) and modeling of transport-kinetic interactions for energy-efficient and environmentally benign design, scale-up and performance. He has studied a wide range of multiphase flow processes including conventional, renewable and sustainable clean energy, fuels, chemical and products. Dr. Al-Dahhan has more than 150 publications in refereed scientific and technical journals and over 350 conference presentations.