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Acknowledgements

My thanks to the Alexander von Humboldt foundation for supporting my scientific
carrier and especially for the financial support during the writing of this book.

Many thanks to Dr. Daniela Dzhonova-Atanasova for her assistance, language
correction and discussions.

I am grateful to my colleagues Prof. Reinhard Billet from the Ruhr-University of
Bochum and Prof. Johann Stichlmair from the Technical University of Munich
for the cooperation in the area of packed bed columns. The results of these works
are used in this book.

My thanks also to my former PhD students Prof. Rumen Daraktchiev, Assoc.
Professors Krum Semkov and Svetoslav Nakov, Dr. Dimitar Kolev and Dr. Elena
Razkazova-Velkova, to Dr. Daniela Dzhonova-Atanasova, and to my PhD student
Borislav Kralev for the long and useful cooperation in the development of the
theory and practice of packed bed columns. Many of the results of this cooperation
have been used in writing the book.

I would like to thank Dr. Michael Schultes from Raschig Ltd and Dr. Lothar Spiegel
from Sulzer Chemtech Ltd for the technical information about the packings and
column internals of these companies which was very useful.

I am also grateful to Dr. Dimitar Kolev, Dr. Elena Razkazova-Velkova and
Borislav Kralev for helping me with this book.