This book is designed to apprise the students of chemical engineering with a variety of different processes of chemical technologies. The book is richly illustrated and covers the essential information with the help of flow diagrams, enabling the students to gain a full understanding of both the fundamental concepts and chemical reactions involved in process technologies. Newer technologies have been dealt with and some technologies which have lost their relevance have been omitted. Computer simulation methods have been described for many important technologies. In short, the book considers computer design tools and design software, in a manner that integrates this knowledge smoothly into the main subject. The book is expected to become useful not only to the students for courses in Chemical Technology but also to practising engineers and process designers for innovative process development. There are topics on natural products and fermentation process chemicals, organic chemicals, inorganic chemicals, refinery operations, oil and gas operations and nanotechnology products. In some of these topics, computer simulation and costing examples are included. An illustration of modelling and simulation using C++, is also given as an example of user-written programs for simulation. Another method that can be used for simulation is the use of spreadsheets, which is also described with the help of an example. A new important topic of today being ‘polysilicon’ used in the manufacture of computer chips and solar panels, is also covered in detail.