Ebook: Extraction of Natural Products Using Near-Critical Solvents

The aim of this book is to present the current state of the art of extracting natural products with near-critical solvents and to view the possibilities of further extensions of the technique. Relevant background theory is given but does not dominate the book. Carbon dioxide is the near-critical solvent used in most recent applications and inevitably receives prominence. In addition to general descriptions and reviews, the book contains three chapters by indus­ trial practitioners who describe in detail the operation of their processes and discuss the market for their products. Sections on the design of the pressure vessels and pumps required in these processes and on the acquisition of the data required for design are included. The costing of the processes is also discussed. There is good scope for combining a near-critical extraction step with other process steps in which the properties of near-critical solvents are utilised, for example as a reaction or crystallisation medium and a chapter is devoted to these important aspects. It is hoped that the work will be found to contain a great deal of specific information of use to those already familiar with this field. However the style of presentation and content is such that it will also be useful as an introduction. In particular it will be helpful to those wondering if this form of separation method has anything to offer for them, whether they are engineers, chemists or managers in industry, or in academic or research institutions.

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The book presents the current state-of-the-art in the extraction of natural products with near-critical solvents. Both existing commercial processes and future prospects are covered.

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The book presents the current state-of-the-art in the extraction of natural products with near-critical solvents. Both existing commercial processes and future prospects are covered.
Content:
Front Matter....Pages i-xi
Introduction....Pages 1-33
Food legislation and the scope for increased use of near-critical fluid extraction operations in the food, flavouring and pharmaceutical industries....Pages 34-49
Other uses for near-critical solvents: chemical reaction and recrystallisation in near-critical solvents....Pages 50-83
Commercial scale extraction of alpha-acids and hop oils with compressed CO2 ....Pages 84-100
Commercial scale decaffeination of coffee and tea using supercritical CO2 ....Pages 101-139
Extraction of flavours and fragrances with compressed CO2 ....Pages 140-183
Physico-chemical data required for the design of near-critical fluid extraction process....Pages 184-231
Design and operation of the pressure vessels used in near-critical extraction processes....Pages 232-260
Pumps and compressors for supercritical extraction: design, characteristics and installation....Pages 261-298
Estimation of separation cost....Pages 299-321
Back Matter....Pages 322-325

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The book presents the current state-of-the-art in the extraction of natural products with near-critical solvents. Both existing commercial processes and future prospects are covered.
Content:
Front Matter....Pages i-xi
Introduction....Pages 1-33
Food legislation and the scope for increased use of near-critical fluid extraction operations in the food, flavouring and pharmaceutical industries....Pages 34-49
Other uses for near-critical solvents: chemical reaction and recrystallisation in near-critical solvents....Pages 50-83
Commercial scale extraction of alpha-acids and hop oils with compressed CO2 ....Pages 84-100
Commercial scale decaffeination of coffee and tea using supercritical CO2 ....Pages 101-139
Extraction of flavours and fragrances with compressed CO2 ....Pages 140-183
Physico-chemical data required for the design of near-critical fluid extraction process....Pages 184-231
Design and operation of the pressure vessels used in near-critical extraction processes....Pages 232-260
Pumps and compressors for supercritical extraction: design, characteristics and installation....Pages 261-298
Estimation of separation cost....Pages 299-321
Back Matter....Pages 322-325
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