Acknowledgments

Many people were very helpful in the writing of the first edition. Dr. Marjan Bace and Prof. Joe Calo got me started writing. A. P. V. Inc., Glitsch Inc., and The Norton Co. kindly provided photographs. Chris Roesel and Barb Naugle-Hildebrand did the original artwork. The secretarial assistance of Carolyn Blue, Debra Bowman, Jan Gray, and Becky Weston was essential for completion of the first edition. My teaching assistants Magdiel Agosto, Chris Buehler, Margret Shay, Sung-Sup Suh, and Narasimhan Sundaram were very helpful in finding errors. Professors Ron Andres, James Caruthers, Karl T. Chuang, Alden Emery, and David P. Kessler, and Mr. Charles Gillard were very helpful in reviewing portions of the text. I also owe a debt to the professors who taught me this material: Lowell Koppel, who started my interest in separations as an undergraduate; William R. Schowalter, who broadened my horizons beyond equilibrium-staged separations in graduate school; and C. Judson King, who kept my interests alive while I was a professor and administrator through his articles, book, and personal example.

For the second and third editions I thank the reviewers, John Heydweiller, Ken Morison, Leonard Pease, David Rockstraw, Stewart Slater, and Joe Shaeiwitz, for their very helpful reviews. I thank my editor, Bernard Goodwin, for his continued support, encouragement, and when needed, prodding.

For the fourth edition I again enjoyed the hospitality of the Department of Chemical and Process Engineering at the University of Canterbury, Christchurch, New Zealand, which gave me the opportunity to learn more mass transfer from Justin Nijdam and the chance to teach crystallization. The reviews of the entire book by Christos Takoudis, of the Aspen Plus computer labs by David Rockstraw, and Chapter 17 by Priscilla Hill were most helpful in polishing this edition. I thank my editor, Laura Lewin, and her assistant, Olivia Basegio, for their assistance and prodding to complete the book in a timely fashion. Susan Brown Zahn was very helpful in formatting the book.

Finally, I could not have finished any of the editions without the love and support of my wife, Dot, and my children, Chuck and Jennie.