Disclosed is a process for recovering volatile compounds from an aqueous tea extract by distilling the said extract by fractional distillation comprising condensing of vapors, separating the oil phase condensate from the aqueous phase and refluxing the substantially oil-free aqueous phase. The crystal blank has a fixed end electrically and mechanically connected to the casing by eutectic alloy in the first position. A delay period of time is allowed to elapse after receiving the idle frame before sending a negative acknowledgement message, if at least one data frame is missing. A first locking mechanism locks the medium-transporting section to the loading position and unlocks the medium-transporting section from the loading position.