Hi,
Essential oil distillation is as much an art as a science, much like brewing a fine beer. There is a compehesive book review section covering the major types of distillation with a focus on 'Aromatic Plant' Distillation. If your specfically interest in essential oil distillation this book is an old one, but still one of the most comprehensive I've come across. The Essential Oils - Vol 1: History - Origin In Plants - Production - Analysis
The full list of book reviews is here.. Distillation and extraction book reviews
If you are looking for some specific pop me message.
Good Luck
