Method and system to transfer a volatile substance

Method and system for transferring a volatile substance from a first liquid to a second liquid. The system includes: - at least one first reservoir (1) for receiving first liquid (A); - at least one second reservoir (2) for receiving second liquid (B); - at least one airtight transfer space (3) overhead of the at least one first and at least one second reservoir (1,2); -at least a first liquid conveyor (5) for generating a film of first liquid (A) from liquid received in said first reservoir (1), and for conveying that film along said airtight transfer space (3); and -at least a second liquid conveyor (6) for generating a film of second liquid (B) from liquid received in said second reservoir (2), and for conveying that film along said airtight transfer space (3).