Separation process topics?

Hello,

I really need help. I have a topic for chemistry by next week, and I have to give a presentation on separation processes, such as coffee, perfume, alcohol, and so on. I can't use those topics because a classmate is already using them. Briefly again, for example, coffee, separation processes, beans, or something like that. Sorry, I'm bad at explaining things. It would be very helpful if you could give me several example topics so I can choose one. It would be best if you could explain the separation process to me. Thanks in advance.