Badria Al-Battashy You can use rotary evaporator if you have one. Rotavap is very efficient and uses vaccum to lower boiling point and also there is cooling section. Its recommend not to use too high temp while drying extract as it breaks phenolic compounds easily. Another way could be using instrument with nitrogen gas flow and vacuum to evaporate smaller scale samples, may be in eppendorf tube or in glass test tube. There is simple method as welll if you don't have any other instruments. Buy a air flow unit which is used in aquarium to flow oxygen, its very cheap. Then attach a pipette tip at the edge of tube of the pump. Then place the tip inside the extract reseviour. It will flow air which will speed up the evaporation process. This process is not recommended but if don't have any other options, then go for it. Thanks.

https://www.researchgate.net/publication/286223841_Effective_extraction_of_polyphenols_and_proanthocyanidins_from_Pomegranate's_peel

Hope you will find this article useful

Cut the peels in to small pieces and sun dry or let them dry at room temperature.

You can also go for vacuume drying if your lab has vacuume drier.

Thanks Sanjib Saha and Wissam Zam

Thanks Tebogo Kwape and Nabanita Ghosh