Preface to the First Edition ix elected. The selection was based on the individual contributors and my own experience,over many years of work in the field, with unit operations and pieces of equipment that have been the backbone and workhorses of the industr The editor wished to express his thanks to Mr. Stanley Grossel of Hoffmann-La Roche and Mr John Carney of Davy McKee Corporation for reviewing and editing the draft copies. He also thanks Miss Mary Watson of Davy McKee Corporation for typing assistance, and Mr. Michael Garze of Davy McKee Corporation for his help in producing many of the graphs and illustrations. Dr Sol Barer, the author of the microbiology chapter acknowl edges the valuable input to the Celanese Biotechnology Department, and especially thanks Miss Maria Guerra for her patience in typing and retyping the manuscript Berkeley Heights, New Jersey Henry c. vogel June 1983Preface to the First Edition ix selected. The selection was based on the individual contributors and my own experience, over many years of work in the field, with unit operations and pieces of equipment that have been the backbone and workhorses of the industry. The editor wished to express his thanks to Mr. Stanley Grossel of HofEnann-La Roche and Mr. John Carney of Davy McKee Corporation for reviewing and editing the draft copies. He also thanks Miss Mary Watson of Davy McKee Corporation for typing assistance, and Mr. Michael Garze of Davy McKee Corporation for his help in producing many of the graphs and illustrations. Dr. Sol Barer, the author ofthe microbiology chapter acknowl￾edges the valuable input to the Celanese Biotechnology Department, and especially thanks Miss Maria Guerra for her patience in typing and retyping the manuscript. Berkeley Heights, New Jersey June 1983 Henry C. Vogel