Abstract
Membrane processes are often competing directly with conventional separation processes. The aim of this study is to highlight the potentials of combinations of membrane processes and conventional separation processes by the means of hybrid processes and process synergies.
The concepts of hybrid processes and process synergies will be introduced and defined supported by industrial examples, e.g. the combination of pervaporation and distillation as a hybrid process to dehydrate alcohols [1] and the combination of reverse osmosis and evaporation as a process synergy to concentrate fruit juices.
The advantages and potentials of hybrid processes and process synergies will be highlighted in a study focusing on the clarification and concentration of apple juice.
For the concentration step, a combination of centrifugation and ultrafiltration as a hybrid process is proposed. The centrifuge removes the larger solids, while the ultrafiltration unit is used for the final clarification. In order to maximise the yield of the process, the retentate stream from the ultrafiltration unit is recycled before centrifugation.
For the concentration step, a combination of reverse osmosis and evaporation as a process synergy is considered. The reverse osmosis unit will pre-concentrate the juice to up to 25ºBrix and then it is passed to an evaporator for final evaporation up to 75ºBrix.
Both process combinations will be evaluated from a technical and economical point of view and compared with stand-alone units.
The concepts of hybrid processes and process synergies will be introduced and defined supported by industrial examples, e.g. the combination of pervaporation and distillation as a hybrid process to dehydrate alcohols [1] and the combination of reverse osmosis and evaporation as a process synergy to concentrate fruit juices.
The advantages and potentials of hybrid processes and process synergies will be highlighted in a study focusing on the clarification and concentration of apple juice.
For the concentration step, a combination of centrifugation and ultrafiltration as a hybrid process is proposed. The centrifuge removes the larger solids, while the ultrafiltration unit is used for the final clarification. In order to maximise the yield of the process, the retentate stream from the ultrafiltration unit is recycled before centrifugation.
For the concentration step, a combination of reverse osmosis and evaporation as a process synergy is considered. The reverse osmosis unit will pre-concentrate the juice to up to 25ºBrix and then it is passed to an evaporator for final evaporation up to 75ºBrix.
Both process combinations will be evaluated from a technical and economical point of view and compared with stand-alone units.
Original language | English |
---|---|
Pages | 623 |
Number of pages | 1 |
Publication status | Published - 2004 Sept 28 |
Event | Euromembrane 2004 - University Hamburg-Harburg, Hamburg, Germany Duration: 2004 Sept 28 → 2004 Oct 1 |
Conference
Conference | Euromembrane 2004 |
---|---|
Country/Territory | Germany |
City | Hamburg |
Period | 2004/09/28 → 2004/10/01 |
Subject classification (UKÄ)
- Chemical Engineering
Free keywords
- Membrane processes
- Food technology