During my long service period in Production, Process Design and Projects, I found most of these information are available at different sources and is not always possible to acquire these infonnation always. ‘Ib meet these gaps, I have given as much information as possible in Volume I and Volume II of this book on various processes, data tables, some unit operations etc. usuany required by Professional Chemical Engineers and Chemical Engg. students. In addition, a chapter on Glossary of Terms has a]so been provided for refreshing the essential information un chemistry and other topics.